Build a Full Custom JavaScript Video Chat App with VideoSDK

Rajan Surani
Video SDK
Published in
3 min readFeb 28, 2022


We have seen a major increase in the usage of virtual meetings in the past year and the existing platforms cannot cater to everyone’s custom needs. Also, building a custom feature-rich solution for your need from scratch is not a great option as you need to manage a lot of tasks, this is where comes to the rescue.

With video SDK you can build a customized Video Chat App with all features your need. We will see in this guide, how you can build a video chat app using Javascript.


  1. Node.js v12+
  2. NPM v6+ (comes pre-installed with newer Node versions)
  3. You should have a video SDK account to generate tokens. Visit the video SDK dashboard to generate a token.

Project Structure

├── index.html
├── assets
│ ├── css
│ │ ├── index.css
│ ├── js
│ ├── index.js

Step 1: Adding VideoSDK

Update the index.html file with the <script ... /> as shown to add the VideoSDK Javascript SDK to your project.

If you don’t want to use <script ... /> you can use `npm` to install VideoSDK in your project.

npm install you can use yarn
yarn add

Step 2: Creating the UI

For the interface, we will have simple Join and Create Meeting meeting buttons which will join and create a new meeting room respectively.

The meeting room will show the local participant view, remote participant view and show buttons to toggle mic, webcam, and leave the meeting.

You can get the complete custom CSS style from here.

We will declare all the DOM variables we will need in the index.js file.

Step 3: Meeting Implementation

To start the meeting implementation, we will need the token so if you don't have one, you can generate it from here.

  1. Now update your token in the index.js file as shown to add the token in the script and add a validator.

2. We have got the token. Now we will add the meetingHandler which will create or join to a meeting room.

3. Now the meetingId is either generated or updated with the value user entered. After this, startMeeting is triggered which is responsible to initialize the meeting with the required configuration and join the meeting.

4. Now we will create the local participant view.

5. To show the remote participants, we will add the event listeners on meeting who will notify us when a participant joins or leaves the meeting.

6. At last, we will add the event listeners to the toggle buttons and leave button.

Run and Test

To run the app you will need live-server. If you don't have it installed already you can do it using:

npm install -g live-server

Once you have the live-server installed, just run it using:



With this, we successfully built the video chat app using the video SDK in Javascript. If you wish to add functionalities like chat messaging, screen sharing, you can always check out our documentation. If you face any difficulty with the implementation you can check out the example on GitHub or connect with us on our discord community.