Setup

Migrating app version from v3 to v4 ?

Skip the create new app step. Your existing v3 app can be migrated to v4.

Follow steps mentioned in Add the CometChat dependency section below to upgrade to latest version of v4

Get your Application Keys

Signup for CometChat and then:

1. Create a new app
2. Head over to the API & Auth Keys section and note the Auth Key, App ID & Region

Add the CometChat Dependency

NPM

Javascript

npm install @cometchat/chat-sdk-javascript@latest --save

Then, import the CometChat object wherever you want to use CometChat.

Javascript

import { CometChat } from "@cometchat/chat-sdk-javascript";

HTML (via CDN)

Include the CometChat Javascript library in your HTML code.

HTML

<script
  type="text/javascript"
  src="https://unpkg.com/@cometchat/chat-sdk-javascript@latest/CometChat.js"
></script>

Initialize CometChat

The init() method initialises the settings required for CometChat. The init() method takes the below parameters:

1. appID - You CometChat App ID
2. appSettings - An object of the AppSettings class can be created using the AppSettingsBuilder class. The region field is mandatory and can be set using the setRegion() method.

The AppSettings class allows you to configure two settings:

• Region: The region where you app was created.
• Presence Subscription: Represents the subscription type for user presence (real-time online/offline status)
• autoEstablishSocketConnection(boolean value): This property takes a boolean value which when set to true informs the SDK to manage the web-socket connection internally. If set to false , it informs the SDK that the web-socket connection will be managed manually. The default value for this parameter is true. For more information on this, please check the Managing Web-Socket connections manually section. The default value for this property is true.
• overrideAdminHost(adminHost: string): This method takes the admin URL as input and uses this admin URL instead of the default admin URL. This can be used in case of dedicated deployment of CometChat.
• overrideClientHost(clientHost: string): This method takes the client URL as input and uses this client URL instead of the default client URL. This can be used in case of dedicated deployment of CometChat.

You need to call init() before calling any other method from CometChat. We suggest you call the init() method on app startup, preferably in the index.js file.

Javascript

let appID = "APP_ID";
let region = "APP_REGION";
let appSetting = new CometChat.AppSettingsBuilder()
  .subscribePresenceForAllUsers()
  .setRegion(region)
  .autoEstablishSocketConnection(true)
  .build();
CometChat.init(appID, appSetting).then(
  () => {
    console.log("Initialization completed successfully");
  },
  (error) => {
    console.log("Initialization failed with error:", error);
  }
);

Typescript

let appID: string = "APP_ID",
  region: string = "APP_REGION",
  appSetting: CometChat.AppSettings = new CometChat.AppSettingsBuilder()
    .subscribePresenceForAllUsers()
    .setRegion(region)
    .autoEstablishSocketConnection(true)
    .build();
CometChat.init(appID, appSetting).then(
  (initialized: boolean) => {
    console.log("Initialization completed successfully", initialized);
  },
  (error: CometChat.CometChatException) => {
    console.log("Initialization failed with error:", error);
  }
);

Make sure you replace the APP_ID with your CometChat App ID and APP_REGION with your App Region in the above code.

Parameter	Description
appID	CometChat App ID
appSetting	An object of the AppSettings class.