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A sample backend that demonstrates how to generate a Virgil JWT and Twilio token used for authentication with the Virgil and Twilio services
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Twilio Sample Backend for Node.js

This repository contains a sample backend code that demonstrates how to combine Virgil and Twilio JWT generation, which are used for authentication with the Virgil and Twilio services.

Do not use this authentication in production. Requests to a /virgil-jwt and /twilio-jwt endpoints must be allowed for authenticated users. Use your application authorization strategy.



Clone the repository from GitHub.

$ git clone

Get Virgil and Twilio Credentials

If you don't have an account yet, sign up for one using your email.

To generate a Virgil JWT the following values are required:

Variable Name Description
API_PRIVATE_KEY Private key of your Virgil API key that is used to sign the JWTs.
API_KEY_ID ID of your Virgil API key. A unique string value that identifies your account in the Virgil Cloud.
APP_ID ID of your Virgil Application.

To generate a Twilio JWT the following values are required:

Variable Name Description
TWILIO_ACCOUNT_SID Your primary Twilio account identifier - find this in the console here.
TWILIO_API_KEY SID of Twilio Api Key. Used for authentication on Twilio services. Generated with TWILIO_API_SECRET
TWILIO_API_SECRET Twilio API key secret: generate one here
TWILIO_SERVICE_SID A service instance where all the data for our application is stored and scoped. Generate one in the console here.

Add Credentials to .env

  • open the project folder
  • create a .env file
  • fill it with your account credentials (take a look at the .env.example file to find out how to setup your own .env file)
  • save the .env file

Install Dependencies and Run the Server

$ npm install
$ npm run start

Now, use your client code to make a request to get a JWT from the sample backend that is working on http://localhost:3000.


/authenticate endpoint

This endpoint is an example of users authentication. It takes user identity and responds with unique token.

POST https://localhost:3000/authenticate HTTP/1.1
Content-type: application/json;

    "identity": "string"


    "authToken": "string"

/virgil-jwt endpoint

This endpoint checks whether a request is authenticated by an authorization header. It takes user's authToken, finds related user identity and generates a virgilToken (which is JSON Web Token) with this identity in a payload. Use this token to make authorized API calls to Virgil Cloud.

GET https://localhost:3000/virgil-jwt HTTP/1.1
Content-type: application/json;
Authorization: Bearer <authToken>


    "virgilToken": "string"

/twilio-jwt endpoint

Same as Virgil token endpoint Twilio endpoint should be protected and responds with twilioToken.

GET https://localhost:3000/twilio-jwt HTTP/1.1
Content-type: application/json;
Authorization: Bearer <authToken>


    "twilioToken": "string"

Virgil JWT Generation

To generate a Virgil JWT, you need to use the JwtGenerator class from the Virgil SDK.

const virgilCrypto = new VirgilCrypto();

const generator = new JwtGenerator({
  appId: process.env.APP_ID,
  apiKeyId: process.env.API_KEY_ID,
  apiKey: virgilCrypto.importPrivateKey(process.env.API_PRIVATE_KEY),
  accessTokenSigner: new VirgilAccessTokenSigner(virgilCrypto)

Then you need to provide an HTTP endpoint which will return the JWT with the user's identity as a JSON.

For more details take a look at the virgilToken.js file.

Demo Twilio backend

If you use Demo Twilio Chat Android or iOS and you looking for its backend, you can find it here:


This library is released under the 3-clause BSD License.


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