React.js Integration

Add CometChat to a React.js app in 4 steps: create project, install, init + login, render.

AI Integration Quick Reference

Field	Value
Package	@cometchat/chat-uikit-react v7.0.x
Peer deps	react >=18, react-dom >=18, @cometchat/chat-sdk-javascript ^4.1.9, dompurify ^3.3.1
Init	CometChatUIKit.init(UIKitSettings) — must resolve before login()
Login	CometChatUIKit.login("UID") — must resolve before rendering components
Order	init() → login() → render <CometChatProvider>. Breaking this order = blank screen
Auth Key	Dev/testing only. Use Auth Token in production
Calling	Optional. Install @cometchat/calls-sdk-javascript and call .setCallingEnabled(true) on UIKitSettingsBuilder
Other frameworks	Next.js · React Router · Astro

This guide walks you through adding CometChat to a React.js app. By the end you’ll have a working chat UI.

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Prerequisites

You need three things from the CometChat Dashboard:

Credential	Where to find it
App ID	Dashboard → Your App → Credentials
Auth Key	Dashboard → Your App → Credentials
Region	Dashboard → Your App → Credentials (e.g. us, eu, in)

You also need Node.js 18+ and npm/yarn installed.

Auth Key is for development only. In production, generate Auth Tokens server-side via the REST API. Never ship Auth Keys in client code.

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Step 1 — Create a React Project

Vite (recommended)

npm create vite@latest my-app -- --template react-ts
cd my-app

Create React App

npx create-react-app my-app --template typescript
cd my-app

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Step 2 — Install the UI Kit

npm

npm install @cometchat/chat-uikit-react @cometchat/chat-sdk-javascript dompurify

yarn

yarn add @cometchat/chat-uikit-react @cometchat/chat-sdk-javascript dompurify

If you want voice/video calling, also install:

npm install @cometchat/calls-sdk-javascript

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Step 3 — Initialize, Login, and Render

Call CometChatUIKit.init() and CometChatUIKit.login() before rendering your app. Then wrap your components in CometChatProvider.

For development, use one of the pre-created test UIDs:

cometchat-uid-1 · cometchat-uid-2 · cometchat-uid-3 · cometchat-uid-4 · cometchat-uid-5

src/main.tsx

import ReactDOM from "react-dom/client";
import { CometChatUIKit, UIKitSettingsBuilder } from "@cometchat/chat-uikit-react";
import App from "./App";

const settings = new UIKitSettingsBuilder()
  .setAppId("YOUR_APP_ID")
  .setRegion("YOUR_REGION")
  .setAuthKey("YOUR_AUTH_KEY")
  .subscribePresenceForAllUsers()
  .build();

CometChatUIKit.init(settings).then(async () => {
  await CometChatUIKit.login("cometchat-uid-1");
  ReactDOM.createRoot(document.getElementById("root")!).render(<App />);
});

src/App.tsx

import { useState } from "react";
import { CometChat } from "@cometchat/chat-sdk-javascript";
import {
  CometChatProvider,
  CometChatConversations,
  CometChatMessageHeader,
  CometChatMessageList,
  CometChatMessageComposer,
} from "@cometchat/chat-uikit-react";

function App() {
  const [chatUser, setChatUser] = useState<CometChat.User | undefined>();
  const [chatGroup, setChatGroup] = useState<CometChat.Group | undefined>();

  const handleConversationClick = (conversation: CometChat.Conversation) => {
    const entity = conversation.getConversationWith();
    if (conversation.getConversationType() === "user") {
      setChatUser(entity as CometChat.User);
      setChatGroup(undefined);
    } else {
      setChatGroup(entity as CometChat.Group);
      setChatUser(undefined);
    }
  };

  return (
    <CometChatProvider>
      <div style={{ display: "flex", height: "100vh" }}>
        <div style={{ width: 360, borderRight: "1px solid #eee" }}>
          <CometChatConversations onItemClick={handleConversationClick} />
        </div>
        <div style={{ flex: 1, display: "flex", flexDirection: "column" }}>
          {(chatUser || chatGroup) && (
            <>
              <CometChatMessageHeader user={chatUser} group={chatGroup} />
              <CometChatMessageList user={chatUser} group={chatGroup} />
              <CometChatMessageComposer user={chatUser} group={chatGroup} />
            </>
          )}
        </div>
      </div>
    </CometChatProvider>
  );
}

export default App;

CometChatProvider supplies theme, locale, plugin registry, and event context to all child components. Init and login must complete before the provider mounts. See the CometChatProvider guide for all props.

For production, use CometChatUIKit.loginWithAuthToken(token) instead of login(uid). Generate auth tokens server-side via the REST API. Never ship auth keys in client code.

By default, session data is stored in localStorage. To use sessionStorage instead, see Setting Session Storage Mode.

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Step 4 — Run

npm run dev

Open http://localhost:5173 (Vite) or http://localhost:3000 (CRA). You should see the conversation list on the left. Click a conversation to open the message panel.

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Choose a Chat Experience

Conversation List + Message View

Two-panel layout — conversation list on the left, messages on the right.

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One-to-One / Group Chat

Single chat window — no sidebar. Good for support chat or embedded widgets.

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Tab-Based Chat

Tabbed navigation — Chat, Call Logs, Users, Settings in separate tabs.

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Build Your Own Chat Experience

Need full control over the UI? Use individual components, customize themes, and wire up your own layouts.

• Sample App — Working reference app to compare against
• Components — All prebuilt UI elements with props and customization options
• Core Features — Messaging, real-time updates, and other capabilities
• Theming — Colors, fonts, dark mode, and custom styling
• Build Your Own UI — Skip the UI Kit entirely and build on the raw SDK

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iFrame Embedding

If your React app runs inside an <iframe>, wrap your tree in CometChatFrameProvider so dialogs and portals mount in the correct frame:

import { CometChatFrameProvider } from "@cometchat/chat-uikit-react";

<CometChatFrameProvider iframeId="cometchat-frame">
  <App />
</CometChatFrameProvider>

Prop	Type	Description
iframeId	string	The DOM id of the target <iframe> element

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Next Steps

Components Overview

Browse all prebuilt UI components

Theming

Customize colors, fonts, and styles

Plugins

Customize message rendering

Troubleshooting

Common issues and fixes