gem-hunter
Language: TypeScript
A collaboration application built with the twilio-video.js SDK and React.js
This application demonstrates a multi-party video application built with Twilio's Programmable Video JS SDK, Twilio's Conversations JS SDK, and Create React App.
You must have the following installed:
You can check which versions of Node.js and NPM you currently have installed with the following commands:
node --version
npm --version
Clone this repository and cd into the project directory:
git clone https://github.com/twilio/twilio-video-app-react.git
cd twilio-video-app-react
Run npm install inside the main project folder to install all dependencies from NPM.
If you want to use yarn to install dependencies, first run the yarn import command. This will ensure that yarn installs the package versions that are specified in package-lock.json.
Twilio Video has partnered with Krisp Technologies Inc. to add noise cancellation to the local audio track. This feature is licensed under the Krisp Plugin for Twilio. In order to add this feature to your application, please run npm run noisecancellation:krisp immediately after the previous step.
The on-screen Captions functionality is provided by the Real-Time Transcriptions for Video(beta) feature. To use captions in this reference application Real-Time Transcriptions must be enabled by default in the Room settings page on the Twilio Console. Note that usage charges will apply.
The app is deployed to Twilio using the Twilio CLI. You can install the Twilio CLI using Homebrew on a Mac or npm.
To install twilio-cli using npm, run the following command:
npm install -g twilio-cli
Note: If you run into permissions errors when installing the twilio-cli globally with the npm install -g command, you might need to change the permissions of your global node_modules directory or configure npm to use a different directory for globally installed npm packages. See this StackOverflow thread, which has more information about both options. This code sample in GitHub is also a helpful guide for how to install npm packages globally without needing to change directory permissions and without sudo.
Login to the Twilio CLI. You will be prompted for your Account SID and Auth Token, both of which you can find on the dashboard of your Twilio console.
twilio login
Note: If you installed the Twilio CLI using npm and you receive an error that the twilio command is not found, you might need to update your Node install prefix. See this StackOverflow thread for more information.
This app requires an additional plugin. Install the CLI plugin with:
twilio plugins:install @twilio-labs/plugin-rtc
Note: If you have previously installed the @twilio-labs/plugin-rtc plugin, please make sure that you are using the most recent version. You can upgrade the plugin by running twilio plugins:update. The chat feature requires version 0.8.1 or greater of @twilio-labs/plugin-rtc.
Before deploying the app, make sure you are using the correct account on the Twilio CLI (using the command twilio profiles:list to check).
The app is deployed to Twilio with a single command:
npm run deploy:twilio-cli
This performs the following steps:
src directoryNOTE: The Twilio Function that provides access tokens via a passcode should NOT be used in a production environment. This token server supports seamlessly getting started with the collaboration app, and while convenient, the passcode is not secure enough for production environments. You should use an authentication provider to securely provide access tokens to your client applications. You can find more information about Programmable Video access tokens in this tutorial. As a precaution, the passcode will expire after one week. To generate a new passcode, redeploy the app:
npm run deploy:twilio-cli -- --override
NOTE: As of November 10th, 2025, Twilio Functions requires Node.js v20 or v22, see the migration guide. If you previously deployed this Twilio Video React App using Node.js v18 then you either need to edit the Function entry in the Twilio Console and select node v22 or else delete the entry in the Twilio Console and redeploy from the command line. The node setting can be found in the Twilio Console in the Functions & Assets section -> Services and select the video-app-xxxx entry.
View the URL and passcode for the Video app with
twilio rtc:apps:video:view
Delete the app with
twilio rtc:apps:video:delete
This removes the Serverless app from Twilio. This will ensure that no further cost are incurred by the app.
If any errors occur after running a Twilio CLI RTC Plugin command, then try the following steps.
twilio plugins:update to update the rtc plugin to the latest version.twilio rtc:apps:video:delete to delete any existing video apps.npm run deploy:twilio-cli to deploy a new video app.The Video app has the following features:
See browser support table for twilio-video.js SDK.
This application requires an access token to connect to a Room for Video and a Conversation for Chat. The included local token server provides the application with access tokens. This token server can be used to run the app locally, and it is the server that is used when this app is run in development mode with npm start. Perform the following steps to setup the local token server:
.env in the root level of the application (example below).TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
TWILIO_API_KEY_SID=SKxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
TWILIO_API_KEY_SECRET=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
TWILIO_CONVERSATIONS_SERVICE_SID=ISxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Now the local token server (see server/index.ts) can dispense Access Tokens to connect to a Room and a Conversation. See .env.example for information on additional environment variables that can be used.
Note: the use of Twilio Conversations is optional. If you wish to opt out, simply run or build this app with the REACT_APP_DISABLE_TWILIO_CONVERSATIONS environment variable set to true.
Run the app locally with
npm start
This will start the local token server and run the app in the development mode. Open http://localhost:3000 to see the application in the browser.
The page will reload if you make changes to the source code in src/.
You will also see any linting errors in the console. Start the token server locally with
npm run server
The token server runs on port 8081 and expects a POST request at the /token route with the following JSON parameters:
{
"user_identity": string, // the user's identity
"room_name": string, // the room name
}
The response will be a token that can be used to connect to a room. The server provided with this application uses the same endpoints as the plugin-rtc Twilio CLI plugin that is used to deploy the app. For more detailed information on the server endpoints, please see the plugin-rtc README.
If you want to see how the application behaves with multiple participants, you can simply open localhost:3000 in multiple tabs in your browser and connect to the same room using different user names.
Additionally, if you would like to invite other participants to a room, each participant would need to have their own installation of this application and use the same room name and Account SID (the API Key and Secret can be different).
Build the React app with
npm run build
This script will build the static assets for the application in the build/ directory.
This application has unit tests (using Jest) and end-to-end tests (using Cypress). You can run the tests with the following scripts.
Run unit tests with
npm test
This will run all unit tests with Jest and output the results to the console.
Run end to end tests with
npm run cypress:open
This will open the Cypress test runner. When it's open, select a test file to run.
Note: Be sure to complete the 'Getting Started' section before running these tests. These Cypress tests will connect to real Twilio rooms and real Twilio conversations, so you may be billed for any time that is used.
The state of this application (with a few exceptions) is managed by the room object that is supplied by the SDK. The room object contains all information about the room that the user is connected to. The class hierarchy of the room object can be viewed here.
One great way to learn about the room object is to explore it in the browser console. When you are connected to a room, the application will expose the room object as a window variable: window.twilioRoom.
Since the Twilio Video SDK manages the room object state, it can be used as the source of truth. It isn't necessary to use a tool like Redux to track the room state. The room object and most child properties are event emitters, which means that we can subscribe to these events to update React components as the room state changes.
React hooks can be used to subscribe to events and trigger component re-renders. This application frequently uses the useState and useEffect hooks to subscribe to changes in room state. Here is a simple example:
import { useEffect, useState } from 'react'; export default function useDominantSpeaker(room) { const [dominantSpeaker, setDominantSpeaker] = useState(room.dominantSpeaker); useEffect(() => { room.on('dominantSpeakerChanged', setDominantSpeaker); return () => { room.off('dominantSpeakerChanged', setDominantSpeaker); }; }, [room]); return dominantSpeaker; }
In this hook, the useEffect hook is used to subscribe to the dominantSpeakerChanged event emitted by the room object. When this event is emitted, the setDominantSpeaker function is called which will update the dominantSpeaker variable and trigger a re-render of any components that are consuming this hook.
For more information on how React hooks can be used with the Twilio Video SDK, see this tutorial: https://www.twilio.com/blog/video-chat-react-hooks. To see all of the hooks used by this application, look in the src/hooks directory.
The VideoProvider component contains much of the logic that relates to connecting to video rooms and acquiring local input devices. The VideoProvider component exposes many properties and methods to the rest of the application through the useVideoContext hook. Similarly, the ChatProvider contains logic that relates to connecting to a Twilio Conversation, and it exposes properties and methods through the useChatContext hook.
The connect function from the SDK accepts a configuration object. The configuration object for this application can be found in src/utils/useConnectionOptions/useConnectionOptions.ts. In this object, we 1) enable dominant speaker detection, 2) enable the network quality API, and 3) supply various options to configure the bandwidth profile.
This application dynamically changes the priority of remote video tracks to provide an optimal collaboration experience. Any video track that will be displayed in the main video area will have track.setPriority('high') called on it (see the VideoTrack component) when the component is mounted. This higher priority enables the track to be rendered at a high resolution. track.setPriority(null) is called when the component is unmounted so that the track's priority is set to its publish priority (low).
This application can be configured to authenticate users before they use the app. Once users have signed into the app with their Google credentials, their Firebase ID Token will be included in the Authorization header of the HTTP request that is used to obtain an access token. The Firebase ID Token can then be verified by the server that dispenses access tokens for connecting to a room.
See .env.example for an explanation of the environment variables that must be set to enable Google authentication.
This repository is publicly available and maintained by Twilio under a limited external contribution model.
Due to limited maintenance capacity, external pull requests are not currently accepted.
GitHub Issues may be used to report reproducible bugs or provide feature feedback about this application. Issues are reviewed on a best-effort basis, with no SLA or guaranteed response.
GitHub Issues are not an official Twilio support channel. For production issues, general usage questions, or account-specific assistance, please contact Twilio Support. If you have a Twilio account manager, you may also escalate through them.
Do not share Personally Identifiable Information (PII) or sensitive account information, including access tokens, API keys, and credentials, in issues, logs, or screenshots.
Report security vulnerabilities privately through Twilio's Vulnerability Disclosure Program, rather than public GitHub Issues.
See CONTRIBUTING.md for reporting guidance.
See the LICENSE file for details.