Warning

Effective April 1, 2025, Twilio will end of life (EOL) our support for Twilio Voice JS SDK version 1.x. In an effort to offer a product with the latest and greatest features, bug fixes, and security patches, we replaced this version with a new one, Voice JS SDK 2.x, in July 2021. To avoid service interruptions, migrate from Voice JS SDK 1.x to Voice JS SDK 2.x (or greater) before April 1, 2025, following our migration guide.

Twilio's JavaScript Voice SDK 2.0 is now GA!

This repository contains an outdated version of Twilio's Javascript Client SDK. We have now released 2.0 as Generally Available. You can find the new repository containing the JavaScript Voice SDK 2.0 here.

This new major version cleans up a lot of the legacy API, such as:

• Removing deprecated methods
• Renaming classes and methods to be less ambiguous
• Implementing the new features from 1.x as defaults rather than behind feature flags
• Completely moving to the new TwilioError class which is standardized between Voice SDKs and contains much more detailed information about errors

Additionally, new features from this point onward will only be added to the 2.0 project, and not be backported to 1.x, so anyone looking to use the latest features will want to be moved to the new 2.0 API.

Existing customers can review our migration guide here.

twilio-client.js

twilio-client.js allows you to add real-time voice and PSTN calling to your web apps.

• API Docs
• More Docs
• Quickstart
• Changelog

Issues and Support

Please check out our common issues page or file any issues you find here on Github. For general inquiries related to the Voice SDK you can file a support ticket. Please ensure that you are not sharing any Personally Identifiable Information(PII) or sensitive account information (API keys, credentials, etc.) when reporting an issue.

Installation

NPM

We recommend using npm to add the Client SDK as a dependency.

npm install twilio-client --save

Using this method, you can import twilio-client.js using ES Module or TypeScript syntax:

import { Device } from 'twilio-client';

Or using CommonJS:

const Device = require('twilio-client').Device;

CDN

Though not recommended, releases of twilio-client.js are also hosted on a CDN and you can include these directly in your web app using a <script> tag.

<script src="https://sdk.twilio.com/js/client/v1.14/twilio.js"></script>

Using this method, twilio-client.js will set a browser global:

const Device = Twilio.Device;

Testing

Running unit tests requires no setup aside from installation (above). You can run unit tests via:

npm run test:unit

Integration tests require some set up:

1. If the account you want to use doesn't already have a TwiML app set up, create one using the TwiML code below.
2. Copy config.example.yaml to config.yaml, replacing the placeholder information with valid credentials.

<?xml version="1.0" encoding="UTF-8"?>
<Response>
  <Dial>
    <Client>
      <Identity>{{To}}</Identity>
      <Parameter name="duplicate" value="12345" />
      <Parameter name="duplicate" value="123456" />
      <Parameter name="custom + param" value="我不吃蛋" />
      <Parameter name="foobar" value="some + value" />
      <Parameter name="custom1" value="{{Custom1}}" />
      <Parameter name="custom2" value="{{Custom2}}" />
      <Parameter name="custom3" value="{{Custom3}}" />
    </Client>
  </Dial>
</Response>

Integration tests can be run via:

npm run test:integration

These tests will run via karma, one at a time, in your system's default Chrome and then Firefox.

Content Security Policy (CSP)

Use the following policy directives to enable CSP that is compatible with twilio-client.js.

script-src https://media.twiliocdn.com https://sdk.twilio.com
media-src mediastream https://media.twiliocdn.com https://sdk.twilio.com
connect-src https://eventgw.twilio.com wss://chunderw-vpc-gll.twilio.com https://media.twiliocdn.com https://sdk.twilio.com

If you are providing a non-default value for Device.Options.edge or Device.Options.region parameter, you need to add the Signaling URI wss://chunderw-vpc-gll-{regionId}.twilio.com in your connect-src directive where regionId is the Region ID as defined in this page. See examples below.

If Device.Options.region is us1

connect-src https://eventgw.twilio.com https://media.twiliocdn.com https://sdk.twilio.com wss://chunderw-vpc-gll-us1.twilio.com

If Device.Options.edge is ashburn

connect-src https://eventgw.twilio.com https://media.twiliocdn.com https://sdk.twilio.com wss://chunderw-vpc-gll-us1.twilio.com

If Device.Options.edge is ['ashburn', 'sydney', 'roaming']

connect-src https://eventgw.twilio.com https://media.twiliocdn.com https://sdk.twilio.com wss://chunderw-vpc-gll-us1.twilio.com wss://chunderw-vpc-gll-au1.twilio.com wss://chunderw-vpc-gll.twilio.com

License

See LICENSE.md