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The CometChat React UI Kit provides pre-built, customizable UI components that developers can use to quickly integrate real-time messaging and calling into any React application.

Check out the Sample App to see the UI Kit in action with a fully functional chat experience including conversations, messaging, calling, and AI features.

• Node.js >= 18
• npm >= 9
• React >= 18

1. Register at the CometChat Dashboard to create an account.
2. Create a new app to get your App ID, Region, and Auth Key.

npm install @cometchat/chat-uikit-react

CometChat Agent Skills teach your AI coding agent how to build with the CometChat React UI Kit in React 18+ apps built with Vite, Create React App, Next.js, React Router, or Astro. Ask your agent to "add chat to my app" and it detects your project setup, walks you through a short plan for your approval, and then writes the integration code directly into your existing app, following the official CometChat guides. The skills work with Claude Code, Cursor, GitHub Copilot, Codex, Windsurf, and other popular coding agents.

Run the installer in your project root (requires Node.js 18+):

npx @cometchat/skills add

The skills are installed for Claude Code by default; pass --ide <agent> (for example, --ide cursor) to install them for a different agent. Then open your project in your agent and prompt it with "add chat to my app", or run /cometchat.

To learn more, visit CometChat Agent Skills.

• Conversations — List and manage one-on-one and group chats
• Messages — Rich message list with reactions, threads, and read receipts
• Calling — Voice and video calling with call logs
• AI Features — AI-powered assistant chat and smart replies
• Theming — CSS custom properties for full visual customization
• Localization — Built-in multi-language support

The project has three test suites: unit tests (Vitest), E2E tests (Playwright), and Storybook.

Unit tests live alongside the source files as *.spec.ts / *.spec.tsx and cover individual components, hooks, and utilities.

Run all unit tests (single pass):

npm test

Run with coverage:

npm run test:coverage

No browser or running server is required.

Storybook provides an interactive development environment for building and testing components in isolation.

Start Storybook (dev mode):

npm run storybook

Opens at http://localhost:6006.

Build static Storybook:

npm run build-storybook

End-to-end tests live in sample-app/e2e/ and run against the live sample app. They cover full user journeys: login, messaging, reactions, threads, groups, calls, search, and more.

Create a new CometChat app (or use an existing one dedicated to E2E testing).

• Go to CometChat Dashboard
• Note down: App ID, Region, Auth Key, REST API Key

In the CometChat Dashboard, enable:

• Stickers (also add sticker packs from settings)
• Calling
• Conversation & Advanced Search
• Polls
• Collaborative Document
• Collaborative Whiteboard

Then, under Chat & Messaging → Settings → General Configuration → Media URL Access, select Presigned URLs

Required for every attachment flow — e2e/multi-attachment, the e2e/message-composer attachment tests, and the image test in e2e/thread-subscription. Without it the upload tray never resolves and those tests time out.

In the Dashboard → BYO Agents:

• UID: ai-agent-e2e
• Name: AI Agent E2E
• Role: @agentic

cd sample-app
cp .env.e2e.example .env.e2e

Fill in .env.e2e:

COMETCHAT_APP_ID=your-app-id
COMETCHAT_REGION=us
COMETCHAT_AUTH_KEY=your-auth-key
COMETCHAT_API_KEY=your-rest-api-key
AI_AGENT_UID=ai-agent-e2e

.env.e2e.example is the full reference — it also carries the optional per-suite flags below, each of which self-skips its tests when left blank:

npx playwright install

Seed test data (one-time, idempotent):

cd sample-app
npm run e2e:seed

Start dev server (keep running in separate terminal):

npm run dev

Run all E2E tests (headless):

npm run e2e

Run with Playwright UI (interactive):

npm run e2e:ui

Run headed (visible browser):

npm run e2e:headed

Run in debug mode:

npm run e2e:debug

Run a specific test file:

npx playwright test e2e/conversations/conversations.spec.ts

To delete all E2E-created data and reset the app:

npm run e2e:cleanup

Engineering & Testing groups — create two public groups named exactly Engineering and exactly Testing (any guids). Add e2e-user-1 to Engineering (the tests send it a message as e2e-user-1 to bring it into the list, then pin it) and e2e-user-2 to Testing (used to send an incoming). The suite resolves both by name at runtime, so no guids go in env. Treat Testing as a free secondary group for future tests.

The pin/save suites (e2e/pin-messages, e2e/save-messages, and the "Pin conversation" block in e2e/conversations) need these enabled on the E2E app:

• Enable in the dashboard: features.ux.messages.pinned.enabled, features.ux.messages.saved.enabled, features.ux.conversations.pinned.enabled.

• Strategy roles: e2e-user-1 is owner/admin; e2e-user-2 is a participant. The UI Kit shows Pin/Unpin to every member and the server enforces who may act — so the permission test asserts the participant is offered Pin message (the deny surfaces as a toast, covered below).

• Pin-message limit test self-skips unless E2E_PIN_MESSAGES_LIMIT=5 (it's only meaningful at a small cap). Set it to your features.ux.messages.pinned.limit.

• Pin-permission deny tests (denied pin / denied unpin / denied pinned-listing) each self-skip until you both (a) apply the matching deny to the participant scope in the Strategy group and (b) set the flag. Apply these in the dashboard after seeding — they act on the Strategy group, so it must already exist:

  • Deny the participant scope pin → set E2E_PARTICIPANT_PIN_DENIED=1.
  • Deny the participant scope unpin → set E2E_PARTICIPANT_UNPIN_DENIED=1.
  • Deny the participant scope pinned-messages listing → set E2E_PARTICIPANT_PIN_LISTING_DENIED=1.

  Leave a flag blank to skip its test. (The deny lives in dashboard config, not seeding, so an un-configured app would let the action through and the test would fail for the wrong reason — hence the self-skip.) There are also three permutation tests that need a specific mix of allowed/denied — a denied listing must not append a realtime pin (pin allowed, listing denied); a denied pin must not reach the list (pin denied, listing allowed); a denied unpin keeps the message listed (unpin denied, pin & listing allowed). Because they need different mixes, the full permission matrix spans more than one env/dashboard configuration — run them in separate passes.

• Each test clears its own pinned/saved state over REST first, so the low pin/save caps never leak between tests. Conversation-pin tests system-pin Strategy and pin only the Engineering chat (Bob stays a read-only fixture).

e2e/thread-subscription needs no dashboard flag of its own, but:

• Stickers and Polls extensions must be enabled (step 2) — the "auto-subscribe by message type" tests send one of each.
• Presigned URLs must be on (step 2) — one test sends an image.
• Runs against Strategy (group cases) and the Bob Smith 1:1 — thread subscription is offered in 1:1 as well as groups, so the 1:1 case asserts the option is present.

Two tests in e2e/multi-attachment/multi-attachment.spec.ts exercise the composer's rejected (non-retryable) upload states. They need inputs that are impractical to commit (a huge file) or that depend on dashboard config, so they skip themselves unless you add a matching fixture to e2e/fixtures/. The lookup is by name prefix, so the extension is up to you (within the limits noted below).

1. File size exceeded — e2e-oversize.*

Any single file larger than 100 MB (any extension) in e2e/fixtures/. You can generate one with:

# from sample-app/
head -c 150000000 /dev/urandom > e2e/fixtures/e2e-oversize.txt   # ~150 MB

2. File type not supported — e2e-blocked-mime.* + E2E_BLOCKED_MIME_TYPE

This test needs both of the following — if either is missing it is skipped:

• A fixture named e2e-blocked-mime.* in e2e/fixtures/. Its extension must not be png, mp4, mp3, or pdf (so it can't collide with the standard fixtures). The file's bytes are what get uploaded; the extension itself doesn't matter beyond that.
• E2E_BLOCKED_MIME_TYPE in .env.e2e, set to the exact MIME type you denied in the dashboard (e.g. E2E_BLOCKED_MIME_TYPE=image/svg+xml). The test attaches this MIME to the upload explicitly. This is required because Playwright can't infer a MIME for exotic extensions and would send an empty one — the server then rejects with mimeType is required (a retryable failure) instead of the permission-denied rejected state the test asserts. There is no fallback: the MIME must come from this env var and must match what you denied.

Where to set the restriction: on the Strategy group → Scope permissions → Admin role. The E2E suite runs against the Strategy group and the e2e user e2e-user- is normally an admin/owner there, so blocking the MIME type for the Admin scope reliably applies to the uploads under test.

cd sample-app
cp .env.e2e.example .env.e2e    # Fill in credentials
npx playwright install           # Install browsers (once)
npm run e2e:seed                 # Seed test data (once)
npm run dev                      # Start dev server
npm run e2e                      # Run tests

For issues running the project or integrating with our UI Kits, consult our documentation or create a support ticket or seek real-time support via the CometChat Dashboard.