JavaScript SDK

The JavaScript API is a minimalistic API library that allows you to work with the Form.io API's within your web application.
Installation
The Form.io SDK is part of our Open Source formio.js library which is found @ https://github.com/formio/formio.js. There are two ways to include the JavaScript SDK into your application. 
Include using script tag
You can include it in a script tag within your application like the following shows.
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<script src="https://cdn.form.io/formiojs/formio.min.js"></script>
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Which would would then be able to do the following within your application.
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<script type="text/javascript">
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    // Load a form.
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    var formio = new Formio('https://myproject.form.io/myform');
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    formio.loadForm().then(function(form) {
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        console.log(form);
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    });
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</script>
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Import into application
You can also import the SDK into your application as follows. 
First perform an npm install using the terminal application.
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npm install --save formiojs
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Then, you can import it into your application as follows.
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import Formio from 'formiojs/Formio';
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​
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// Load a form
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const formio = new Formio('https://myproject.form.io/myform');
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formio.loadForm().then(function(formio) {
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  console.log(formio);
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});
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Usage
Creating an instance of Formio is simple, and takes only a path (URL String). The path can be different, depending on the desired output. The Formio instance can also access higher level operations, depending on how granular of a path you start with.
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const formio = new Formio(<endpoint>, [options]);
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Where endpoint is any valid API endpoint within Form.io. These URL's can provide a number of different methods depending on the granularity of the endpoint. This allows you to use the same interface but have access to different methods depending on how granular the endpoint url is.
The options (optional) is used to configure certain behaviors of the JavaScript API. The following options are available.
Property
Description
Example
base
Allows you to override the base api url.
​https://api.form.io​
project
Allows you to override the project api url.
​https://humanresources.form.io​
namespace
The namespace to store the localStorage variables. Defaults to formio
formio
API Scopes
When using the JavaScript SDK, it is important to understand the different kinds of API scopes that are being queried via the API. The Form.io API is hierarchical which is also congruent with the JavaScript SDK when making API calls with the SDK. The following scopes are provided via the Form.io API / SDK (we will use "formio.com" as the hypothetical domain name you have deployed the Form.io platform against.
Scope
Description
Example API
Root
This is the root or base URL for your Form.io deployment
https://formio.com
Project
This is the API endpoint for a specific project
:rootScope/project/:projectId
Form
This is the API endpoint for a specific 
:projectScope/form/:formId
Submission
This is the API endpoints for a specific submission
:formScope/submission/:submissionId
Action
This is the API endpoints for specific action
:formScope/action/:actionId
Role
This is the API endpoints for a specific role.
:projectScope/role/:roleId
Project and Form Aliases
The Form.io API also uses aliases to make the use of the hierarchical API's easier to use. Currently, we provide alias support for both Projects and Forms, so that a typical Form URL would look like the following.
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https://formio.com/myproject/myform
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Where "formio.com" would be replaced with the URL of your deployment, "myproject" would be replaced with the alias name of your project, and "myform" would be replaced with the name of your form. All API endpoints within the examples below will use this URL format to demonstrate the different kinds of SDK methods.
Examples
 If you wish to load the project JSON, or search for forms, you will instantiate as follows.
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const formio = new Formio('https://formio.com/myproject');
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formio.loadForms().then((forms) => {
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  console.log(forms);
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});
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If you wish to load a specific submission.
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const formio = new Formio('https://formio.com/myproject/myform/submission/23234234234234');
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formio.loadSubmission().then((submission) => {
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  console.log(submission);
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});
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Now that we understand how the SDK works, we can see all of the different API's available to the different API scopes as follows.
Static Methods
There are a few methods that are used statically, meaning that they do not require the new Formio as the other methods require. These methods can be used as globals that are able to define the behavior of the JavaScript SDK and all instances created afterward. These methods are as follows.
Formio.setBaseUrl(baseUrl)
Sets the Base URL of the renderer and SDK. This is a very important method that allows you to provide to the JavaScript SDK the Base Deployment URL of your API platform. This is always going to be the root URL of your deployment, which is also the same as the URL for the deployed developer portal application (if you have that enabled). The best way to know if you have this correct is that you should see the "status" of your deployment by going to :baseUrl/status If this shows the version of the server, then you know this is the value of the base URL.
Example:
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Formio.setBaseUrl('https://forms.yoursite.com');
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Formio.setProjectUrl(projectUrl)
This is the Project URL that will be used to reference any Project endpoints within the SDK and renderer. This is also important to establish within your application to ensure that all relative urls are referencing the correct Project endpoints.
Example:
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Formio.setProjectUrl('https://forms.yoursite.com/yourproject');
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Formio.fetch(...)
This method is a simple shim around the HTTP Fetch polyfill. 
Formio.request(url, [method], [data], [header], [opts])
A static method to perform an API request to any REST API endpoint. This method is a simple wrapper around the JavaScript fetch method with the added handling of JWT tokens as well as implements a Caching mechanism for GET requests to ensure that multiple requests of the same nature do not constantly spam the API server. It's parameters are defined as follows.
Parameter
Description
url
The URL you wish to send the request to.
method (optional)
The method of the request.  GET, PUT, POST, DELETE
data (optional)
The data to include for PUT and POST requests
header (optional)
An instance of the HTTP Header class to define headers for this request.
opts (optional)
See Query Options​
Example: Send a request to fetch submissions.
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Formio.request(
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  'https://examples.form.io/customers/submission?data.number=1',
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  'GET',
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  null,
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  null,
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  {
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    headers: {
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      'content-type': 'application/json'
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    },
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    mode: 'cors',
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  }).then(function(result) {
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    console.log(result);
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  });
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Formio.makeStaticRequest(url, [method], [data], [opts])
This static method performs an API call to the Form.io API platform. This method is very similar to other request method but will also send the request through the Form.io fetch plugin to allow any fetch plugin to intercept the request being made. Its parameters are defined as follows.
Parameter
Description
url
The URL you wish to send the request to.
method (optional)
The method of the request.  GET, PUT, POST, DELETE
data (optional)
The data to include for PUT and POST requests
opts (optional)
See Query Options​
Formio.setToken(token)
Sets or removes the JWT token within localStorage. 
Parmeter
Description
token
A JWT token to set within localStorage. If the value of this parameter is empty, then the token will be deleted from localStorage.
Formio.getToken()
Retrieve the JWT token from localStorage.
Formio.setUser(user)
Sets the User JSON object of the currently logged in user. This is the same JSON object that you would get if you sent an API request to /current with your current JWT token. This user object is then stored within localStorage as formioUser unless a different namespace option is being used.
Parameter
Description
user
The JSON of the user object that is fetched from the /current endpoint.
Formio.getUser()
Fetch the user JSON object from the localStorage.
Formio.currentUser([formio], [opts])
Fetch the current user via the /current API endpoint.
Parameter
Description
formio (optional)
An instance of the Formio SDK if necessary.
opts (optional)
See Query Options​
Formio.accessInfo([formio])
Retrieves the access information for a specific project. You must ensure you set the project url using Formio.setProjectUrl() before calling this method.
Parameter
Description
formio (optional)
An instance of the Formio SDK if necessary.
Formio.projectRoles([formio])
Retrieves the roles for a specific project. You must ensure you set the project url using Formio.setProjectUrl() before calling this method.
Parameter
Description
formio (optional)
An instance of the Formio SDK if necessary.
Formio.clearCache()
Clears all the fetch caches to ensure that any future requests will retrieve fresh data from the API's.
Formio.logout([formio], [opts])
Perform a logout against the Form.io API server. 
Formio.pageQuery()
Helper function to retrieve all of the URL query parameters in a javascript key-value pair mapped object.
Example: Given the following url
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https://yourapp.formio.com/#/home?data.firstName=Travis&sort=-created
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If you run this method on that page, it will return the following.
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const pageQuery = Formio.pageQuery();
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console.log(pageQuery['data.firstName']); // Prints "Travis"
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console.log(pageQuery.sort); // Prints "-created"
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Formio.ssoInit([type], [options])
Initializes an SSO processes. This is used during SAML authentication processes to instantiate and continue a SAML SSO process.
Instantiate a SAML SSO process
Assuming that your project is configured for SAML, you can instantiate an SSO process by executing the following.
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Formio.ssoInit('saml')
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Process a SAML response
Once the SAML authentication returns to the application, you can process that response using the following.
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if (Formio.pageQuery().saml) {
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    const sso = Formio.ssoInit('saml');
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    if (sso) {
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        sso.then((user) => {
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          window.location.href = '/';
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        });
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    }
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}
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The following parameters can be used.
Parameter
Description
type
The type of SAML sso authentication to instantiate. Either "saml" or "okta"
options
An object of options, which depends on the type.
​
For saml type: 
    - relay: This is the variable that will be provided to the relay of the sso process.
 
For okta type:
    -  OktaAuth: An instance of the OktaAuth javascript object provided by Okta Javascript SDK
    - formio: An instance of the Form.io SDK.
    - scopes: A string of CSV scopes to apply
Formio.requireLibrary(name, property, src, [polling])
  Require an external JavaScript library for lazy-loading purposes.
Parameter
Description
name
The name of the library
property
The property that is added to the "window" object that indicates that the library has finished loading. For example, if you are wanting to load the "Lodash" library, the variable that is added to the window object is "_"
src
The URL of the library you wish to load.
polling
Creates a polling check to see if the library has finished loading.
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Formio.requireLibrary(
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    'lodash',
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    '_',
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    'https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js',
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    true
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).then(function() {
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    console.log(_.version); // Lodash is now part of the dom.
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});
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Formio.libraryReady(name)
Returns a promise that will resolve once the library of the provided name is ready to be used.
Parameter
Description
name
The name of the library to check if it is ready or not.
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Formio.libraryReady('lodash').then((_) => {
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    // Lodash is now ready!
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    console.log(_);
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});
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Formio.loadProjects([query], [opts])
A static method to load all projects within the configured baseUrl of the SDK.
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
Formio.serialize(obj, [interpolate])
A method that will serialize a data map key-value pair object into a URL query string.
Parameter
Description
obj
The object to serialize into a URL query string.
interpolate (optional)
An optional interpolation method to interpolate certain values that are added.
Project API Scope
The following API's are defined at the Project Scope. To instantiate the SDK at the project scope, you simply need to provide a Project API to the constructor as follows.
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const formio = new Formio('https://forms.formio.com/myproject')
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where "myproject" would be the alias name of your project. Once you have instantiated the SDK with the following URL, the following methods are now available to you at the Project Scope.
formio.loadProject([query], [opts])
Loads the project using the following Project Load API
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
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formio.loadProject().then((project) => {
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    // Prints the project JSON
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    console.log(project);
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});
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formio.saveProject(project, [opts])
Creates or Updates a project depending on if the _id of the project is provided (upsert).
Example: Create a new project
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const formio = new Formio('https://api.form.io');
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formio.saveProject({
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    "title": "New Project",
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    "name": "proj980",
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    "description": "An example application",
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    "settings": {
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        "cors": "*"
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    }
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}).then((project) => {
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    // Prints the project that was saved via API.
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    console.log(project);
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});
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Example: Update an existing project.
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const formio = new Formio('https://forms.formio.com/myproject');
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formio.loadProject().then((project) => {
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    project.title = 'Updated Title';
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    formio.saveProject(project).then((updated) => {
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        // Prints the updated project json.
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        console.log(updated);
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    });
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});
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Parmameters
Description
project
The project JSON you wish to create or update. If an "_id" is provided within the json, an update operation will be executed, otherwise it will create a new project.
opts (optional)
See Fetch Options​
formio.deleteProject([opts])
Deletes a project.
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var formio = new Formio('https://myproject.form.io');
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formio.deleteProject().then(() => {
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    console.log('The project has been deleted!');
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});
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Parmameters
Description
opts (optional)
See Fetch Options​
formio.loadForms([query], [opts])
Loads all the forms within a project. This implements the List Forms API.
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
Example: List all Resources within a project, sort them based on created date, and only return the "title" and "path" of those forms
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formio.loadForms({
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  params: {
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    type: 'resource',
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    select: 'title,path',
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    sort: '-created'
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  }
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}).then((resources) => {
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  console.log(resources);
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});
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Example: List all Forms within a project, limit them to 20, and only return the "title" of those forms.
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formio.loadForms({
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  params: {
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    type: 'form',
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    select: 'title',
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    limit: 20
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  }
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}).then((forms) => {
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  console.log(forms);
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});
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formio.getTempToken(expire, allowed, [options])
Retrieves a temporary auth token which can be used in conjunction with the PDF API's to download a PDF output of a submission.
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formio.getTempToken(
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    3600, 
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    'GET:/project/234234234234234/form/234234234234234/submission/234234234234234/download'
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).then((tokens) => {
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    console.log(tokens);
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});
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formio.loadRoles([opts])
Loads a list of roles for the provided project. Implements the List Roles API​
Parameter
Description
opts (optional)
See Fetch Options​
formio.getProjectId()
Returns the Project ID of the project in context, even if the URL provided to the constructor uses the project alias.
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const formio = new Formio('https://forms.formio.com/myproject');
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formio.getProjectId().then((projectId) => {
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    // Prints the project id for the "myproject" project.
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    console.log(projectId);
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});
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formio.accessInfo()
Retrieve the access information for a project. This method implements the Project Access Info API​
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formio.accessInfo().then((accessInfo) => {
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    // Output the role information for this project.
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    console.log(accessInfo.roles);
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});
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formio.currentUser()
Based on the JWT token stored within the localStorage, this method will retrieve the current user metadata and information.
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formio.currentUser().then((user) => {
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    // The current user.
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    console.log(user);
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});
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Form API Scope
The following API's are available when the Form.io SDK is instantiated with the form scope like the following illustrates
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const formio = new Formio('https://forms.formio.com/myproject/myform');
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formio.loadForm([query], [opts])
Loads a form json
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
formio.saveForm(form, [opts])
Creates or Updates a form depending on if an "_id" property is provided within the form json.
Parameter
Description
form
The JSON of the form to save or update. If an "_id" is provided as a property of the form json, then an update operation is performed, otherwise, it will create a new form.
opts (optional)
See Fetch Options​
Example: Create a new form
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// Project scope is only required for creating new forms.
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const formio = new Formio('https://forms.formio.com/myproject');
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​
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formio.saveForm({
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  title: 'Registration',
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  path: 'registration',
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  name: 'registration',
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  components: [
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    {type: 'textfield', key: 'firstName', label: 'First Name'}
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    {type: 'textfield', key: 'lastName', label: 'Last Name'}
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  ]
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}).then((form) => {
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  // Prints out the saved form object.
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  console.log(form);
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});
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Example: Update an existing form
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const formio = new Formio('https://forms.formio.com/myproject/myform');
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formio.loadForm().then((form) => {
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  form.title = 'Updated title';
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  formio.saveForm(form).then((updated) => {
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    console.log(updated);
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  });
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});
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formio.deleteForm([opts])
Deletes a form
Property
Description
opts (optional)
See Fetch Options​
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const formio = new Formio('https://forms.formio.com/myproject/myform');
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formio.deleteForm().then(() => {
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    console.log('Form was deleted!');
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});
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formio.getFormId()
Returns the form Id of the form in context even if the form alias was provided for this form.
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const formio = new Formio('https://forms.formio.com/myproject/myform');
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formio.getFormId().then((formId) => {
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    // Prints the form id for "myform"
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    console.log(formId);
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});
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formio.loadSubmissions([query], [opts])
Loads a view of submissions for a form. This implements the Get Submissions API​
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
Example: Load first 10 submissions, sort by descending created date
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formio.loadSubmissions({
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  params: {
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    sort: '-created'
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  }
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}).then((submissions) => {
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  console.log(submissions);
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});
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Example 2: Load first 20 submissions where the form field age is greater than 18, and sort by modified.
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formio.loadSubmissions({
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    params: {
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        sorted: 'modified',
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        'data.age__gt': 18,
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        limit: 20
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    }
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}).then((submissions) => {
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    console.log(submissions);
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});
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formio.loadActions([query], [opts])
Loads the Actions for a given form. This implements the List Actions API​
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
Examples will be very similar to the loadSubmissions API, but will query against the action json objects instead.
formio.availableActions()
Returns a list of available actions that can be added to this form. Implements the Available Actions API.​
formio.actionInfo(name)
Returns the action information for a specific action including the settings form. This implements the Action Info API​
Parameter
Description
name
The name of the action you would like to retrieve information on.
Submission API Scope
The following API's are available when the Form.io SDK is instantiated with the submission scope like the following illustrates
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const formio = new Formio('https://forms.formio.com/myproject/myform/submission/234234234234234');
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formio.loadSubmission([query], [opts])
Loads a submission for a given form.
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
Example: Load the submission
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const formio = new Formio('https://forms.formio.com/myproject/myform/submission/234234234234234');
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formio.loadSubmission().then((submission) => {
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    console.log(submission);
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});
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formio.saveSubmission(submission, [opts])
Creates or Updates a submission depending on if an "_id" property is provided within the submission json.
Parameter
Description
submission
The JSON of the submission to save or update. If an "_id" is provided as a property of the submission json, then an update operation is performed, otherwise, it will create a new submission.
opts (optional)
See Fetch Options​
Example: Create a new submission
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// Form scope is only required for creating new submissions.
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const formio = new Formio('https://forms.formio.com/myproject/myform');
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​
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formio.saveSubmission({
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  data: {
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    firstName: 'Joe',
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    lastName: 'Smith'
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  }
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}).then((submission) => {
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  // Prints out the saved submission object.
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  console.log(submission);
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});
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Example: Update an existing submission
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const formio = new Formio('https://forms.formio.com/myproject/myform/submission/234234234234234');
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formio.loadSubmission().then((submission) => {
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  submission.data.firstName = 'Updated Name';
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  formio.saveSubmission(submission).then((updated) => {
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    console.log(updated);
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  });
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});
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formio.deleteSubmission([opts])
Deletes a submission
Property
Description
opts (optional)
See Fetch Options​
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const formio = new Formio('https://forms.formio.com/myproject/myform/submission/234234234234234');
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formio.deleteSubmission().then(() => {
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    console.log('Submission was deleted!');
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});
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formio.getDownloadUrl([form])
Retrieves a PDF download url for a specific form.
Parameter
Description
form
The form JSON to retrieve a download url from. If none is provided, then it will use the form that is in scope.
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const formio = new Formio('https://forms.formio.com/myproject/myform/submission/234234234234234');
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formio.getDownloadUrl().then((url) => {
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    // This will print the PDF download url, which also includes the temp token.
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    console.log(url);
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});
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formio.uploadFile(storage, file, fileName, dir, progressCallback, url, options, fileKey, groupPermissions, groupId, uploadStartCallback, abortCallback)
Uploads a file to the provided storage system. See File Component for specific usage and implementation details.
formio.downloadFile(file, [options])
Downloads a file from the provided storage system. See File Component for specific usage and implementation details.
formio.deleteFile(file, [options])
Deletes a file from the provided storage system. See File Component for specific usage and implementation details
Action API Scope
The following API's are available when the Form.io SDK is instantiated with the action scope like the following illustrates
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const formio = new Formio('https://forms.formio.com/myproject/myform/action/234234234234234');
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formio.loadAction([query], [opts])
Loads an action for a given form.
Parameter
Description
query (optional)
See Query Options​
opts (optional)
See Fetch Options​
Example: Load the action
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const formio = new Formio('https://forms.formio.com/myproject/myform/action/234234234234234');
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formio.loadAction().then((action) => {
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    console.log(action);
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});
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formio.saveAction(action, [opts])
Creates or Updates an action depending on if an "_id" property is provided within the action json.
Parameter
Description
action
The JSON of the action to save or update. If an "_id" is provided as a property of the action json, then an update operation is performed, otherwise, it will create a new action.
opts (optional)
See Fetch Options​
Example: Create a new action
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// Form scope is only required for creating new actions.
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const formio = new Formio('https://forms.formio.com/myproject/myform');
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​
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formio.saveAction({
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	"data": {
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		"name": "email",
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		"title": "Email",
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		"method": ["create"],
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		"handler": ["after"],
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		"priority": 0,
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		"settings": {
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			"emails": ["[email protected]"],
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			"from": "[email protected]",
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			"message": "{{ submission(data, form.components) }}",
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			"subject": "New submission for {{ form.title }}.",
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			"transport": "default"
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		}
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	}
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}).then((action) => {
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  // Prints out the saved action object.
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  console.log(action);
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});
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Example: Update an existing submission
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const formio = new Formio('https://forms.formio.com/myproject/myform/action/234234234234234');
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formio.loadAction().then((action) => {
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  action.title = 'Updated Action Title';
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  formio.saveAction(action).then((updated) => {
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    console.log(updated);
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  });
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});
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formio.deleteAction([opts])
Deletes an action
Property
Description
opts (optional)
See Fetch Options​
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const formio = new Formio('https://forms.formio.com/myproject/myform/action/234234234234234');
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formio.deleteAction().then(() => {
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    console.log('Action was deleted!');
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});
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Role API Scope
The following API's are available when the Form.io SDK is instantiated with the role scope like the following illustrates
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const formio = new Formio('https://forms.formio.com/myproject/role/234234234234234');
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formio.loadRole([opts])
Loads a role json.
Parameter
Description
opts (optional)
See Fetch Options​
Example: Load the role
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const formio = new Formio('https://forms.formio.com/myproject/role/234234234234234');
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formio.loadRole().then((role) => {
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    console.log(role);
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});
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formio.saveRole(role, [opts])
Creates or Updates a role depending on if an "_id" property is provided within the role json.
Parameter
Description
role
The JSON of the role to save or update. If an "_id" is provided as a property of the role json, then an update operation is performed, otherwise, it will create a new role.
opts (optional)
See Fetch Options​
Example: Create a new role
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// Project scope is only required for creating new roles.
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const formio = new Formio('https://forms.formio.com/myproject');
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​
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formio.saveRole({
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	title: 'Employee',
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  description: 'A person who belongs to a company.'
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}).then((role) => {
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  // Prints out the saved role object.
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  console.log(role);
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});
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Example: Update an existing role
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const formio = new Formio('https://forms.formio.com/myproject/role/234234234234234');
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formio.loadRole().then((role) => {
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  role.title = 'Manager';
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  formio.saveRole(role).then((updated) => {
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    console.log(updated);
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  });
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});
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formio.deleteRole([opts])
Deletes a role
Property
Description
opts (optional)
See Fetch Options​
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const formio = new Formio('https://forms.formio.com/myproject/role/234234234234234');
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formio.deleteRole().then(() => {
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    console.log('Role was deleted!');
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});
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Utility Methods
formio.isObjectId(id)
Determines if the provided "id" is a valid MongoDB ObjectId
formio.userPermissions([user], [form], [submission])
Fetches an object that describes the users permissions as it pertains to the provided user, form, and submission. If any of these are not provided, then the current object in context is used.
formio.canSubmit()
Returns a promise if the user can submit the form in scope.
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const formio = new Formio('https://forms.formio.com/myproject/myform');
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formio.canSubmit().then((canSubmit) => {
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    if (canSubmit) {
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        console.log('The user can submit the form!');
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    }
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    else {
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        console.log('The user cannot submit the form!');
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    }
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});
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Fetch Plugin API
Formio.js can register plugins that can hook into request calls in several ways. Every fetch plugin is defined using the following JSON structure.
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const FetchPlugin = {
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    /**
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     * The priority of the plugin relative to other plugins that determines call 
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     * order. Higher numbers have higher priority. If not specified it will 
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     * default to a priority of 0.
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     */
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    priority: 0,
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    /**
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     * An initialization function called when registered with Formio.
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     *
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     * @param Formio - The static class of the Form.io SDK
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     */
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    init: (Formio) => {
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    },
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    /**
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     * A deregistration function called when deregistering with Formio
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     *
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     * @param Formio - The static class of the Form.io SDK
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     */
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    deregister: (Formio) => {
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    }
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};
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​
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Formio.registerPlugin(FetchPlugin, 'customfetch');
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Formio.registerPlugin(plugin, [name])
Registers a fetch plugin with the Form.io SDK. 
Parameter
Description
plugin
An instance of the Fetch plugin as described above.
name (optional)
The name of this plugin so that it can be retrieved easily later
Formio.getPlugin(name)
Returns the plugin registered with the given name.
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const plugin = Formio.getPlugin('customplugin');
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Formio.deregisterPlugin(plugin)
Deregisters a plugin with Form.io SDK. It will call the deregister function on the plugin before deregistering. The plugin argument can be the instance of the plugin or the optional name given when registered. Returns true if the plugin was successfully deregistered, false if the plugin does not exist.
Plugin hooks
Plugins can provide hooks that are invoked at different points in the library. To use a particular hook below, add a function to your plugin with the same name as the hook.
The following are the currently available hooks.
preRequest(requestArgs)
Called before a request. If you return a promise, Formio.js will wait for it to resolve before starting the request.
requestArgs is an object that contains the following properties:
formio: The Formio instance calling the request.
type: The type of resource being requested (ex: form, forms, submission).
url: The url being requested.
method: The HTTP request method.
data: The HTTP request body, if any.
opts: Any opts given to the request