Chat JavaScript v3
Chat JavaScript
New Docs for the latest Chat SDK v4 beta for JavaScript is now available.Go to v4 beta

Send your first message

With Sendbird Chat SDK for JavaScript, you can efficiently integrate real-time chat into a client app. On the client-side implementation, you can initialize and configure the chat with minimal effort. On the server-side, Sendbird ensures reliable infra-management services for the chat service within your app.

This page demonstrates how to install the Chat SDK in your app so that you can send your first message in just a few simple steps. In addition, try building your app on top of our sample app to jumpstart your build.

Note: To learn about how to build a chat app using React Native and Hooks, see our React Native chat tutorial.

Supported browsers

The following table lists browsers and their versions we support.


Internet Explorer

10 or higher


13 or higher


16 or higher


11 or higher


7 or higher


12.1 or higher

iOS Safari

7 or higher

Android Browser

4.4 (Kitkat) or higher

Note: Sendbird server supports Transport Layer Security (TLS) from version 1.0 up to 1.3. For example, in the server regions where TLS 1.3 isn’t available, lower versions, sequentially from 1.2 to 1.0, will be supported for secure data transmission.

Before you start

Before installing Sendbird Chat SDK, you need to create a Sendbird application on the Sendbird Dashboard, which comprises everything required in a chat service including users, messages, and channels. You will need the App ID of your Sendbird application when initializing the Chat SDK.

Note: Each Sendbird application can be integrated with a single client app. Within the same application, users can communicate with each other across all platforms, whether they are on mobile devices or on the web.

Sendbird UIKit

UIKit is a Sendbird Chat SDK add-on with user interfaces that enable an easy and fast integration of standard chat features into new or existing client apps.

If you would like a sample app with embedded UIs, see UIKit Quickstart for React.

Get started

To send a message in a client app, you should build and configure an in-app chat using Sendbird Chat SDK. Sendbird Chat SDK can be installed through either a web sample project or React Native project.

Step 1 Install Sendbird Chat SDK

Installing Sendbird Chat SDK is simple if you’re familiar with using external libraries or SDK’s in your projects. You can install the Chat SDK with npm using the following command.

$ npm install sendbird

Or you can download the latest Chat SDK for JavaScript, copy the Chat SDK to your project classpath (most commonly the lib/ directory), and then include the Chat SDK file to your working file.

Note: For Sendbird Chat SDK v3.0.127 or higher, you should also add the axios library into the <script> tag before adding the Sendbird library. You can host the library yourself or make use of a CDN.

<script src=""></script>
<!-- or -->
<script src="lib/SendBird.min.js"></script>

Step 2 Initialize Sendbird Chat SDK

Now, initialize Sendbird Chat SDK in the app to allow the Chat SDK to respond to changes in the connection status in JavaScript client apps. Initialization requires the App ID, which can be found on the Sendbird Dashboard.

Note: The new SendBird() method must be called across a client web app at least once. We recommend that you initialize the Chat SDK at the top of your JavaScript file.

With local caching, a new optional parameter has been added to the SendBird() method, which is localCacheEnabled.

The localCacheEnabled determines whether the client app will use the local storage through Sendbird Chat SDK or not. Because this is optional, the default value will be false. If you want to build a client app with our local caching functionalities, set the localCacheEnabled to true.

// Initialize SendBird instance to use APIs in your app.
var sb = new SendBird({appId: APP_ID, localCacheEnabled: true });   // The `localCacheEnabled` is optional.

Step 3 Connect to Sendbird server

You will need a user in order to send a message to a channel. You can either create a user on our dashboard or use a unique ID that hasn't been taken by any of your Sendbird application users. In the latter case, a new user will be automatically created in your Sendbird application before being connected.

Note: To learn more about authenticating with an access token, go to Authentication.

// The USER_ID below should be unique to your Sendbird application.
sb.connect(USER_ID, function(user, error) {
    if (error) {
        // Handle error.

    // The user is connected to Sendbird server.

Step 4 Create a new open channel

Create an open channel. Open channels are where all users in your Sendbird application can easily participate without an invitation.

The following codes show how to create an open channel.

sb.OpenChannel.createChannel(function(openChannel, error) {
    if (error) {
        // Handle error.

    // An open channel is successfully created.
    // Through the "openChannel" parameter of the callback function,
    // you can get the open channel's data from the result object that Sendbird server has passed to the callback function.

Note: You can also create a group channel to send a message. To learn more, see Create a channel in the Group channel page.

Step 5 Enter the channel

Enter the open channel to send and receive messages.

// The CHANNEL_URL below can be retrieved using the openChannel.url.
sb.OpenChannel.getChannel(CHANNEL_URL, function(openChannel, error) {
    if (error) {
        // Handle error.

    // Call the instance method of the result object in the "openChannel" parameter of the callback function.
    openChannel.enter(function(response, error) {
        if (error) {
            // Handle error.

        // The current user successfully enters the open channel,
        // and can chat with other users in the channel by using APIs.

Step 6 Send a message to the channel

Finally, send a message to the channel. To learn more about the message type you can send, see Message.

const params = new sb.UserMessageParams();
params.message = TEXT_MESSAGE;

openChannel.sendUserMessage(params, function(message, error) {
  if (error) {
    // Handle error.
  // The message is successfully sent to the channel.
  // The current user can receive messages from other users through the onMessageReceived() method of an event handler.

Step 7 Receive a message

Add the onMessageReceived() channel event handler using the addChannelHandler() method so that you can receive the message you just sent to the channel. You can also see the message on our dashboard.

var channelHandler = new sb.ChannelHandler();

channelHandler.onMessageReceived = function(channel, message) {

sb.addChannelHandler(UNIQUE_HANDLER_ID, channelHandler);    // The `UNIQUE_HANDLER_ID` is a unique identifier
                                                            // to register multiple concurrent handlers.