ChatJS

Stop rebuilding the same AI chat infrastructure. ChatJS gives you a production-ready foundation with authentication, 120+ models, streaming, and tools so you can focus on what makes your app unique.

Website · Live Demo · Documentation

CLI

Create a new ChatJS app:

npx @chat-js/cli@latest create my-app

The CLI walks you through gateway, features, and auth choices, generates chat.config.ts, and lists the env vars required by your selections.

Features

• 120+ Models: Claude, GPT, Gemini, Grok via one API
• Auth: GitHub, Google, anonymous. Ready to go.
• Attachments: Images, PDFs, docs. Drag and drop.
• Resumable Streams: Continue generation after page refresh
• Branching: Fork conversations, explore alternatives
• Sharing: Share conversations with public links
• Web Search: Real-time web search integration
• Image Generation: AI-powered image creation
• Code Execution: Run code snippets in sandbox
• MCP: Model Context Protocol support
• Desktop App: Package as a native macOS, Windows, or Linux app with Electron

Stack

• Next.js - App Router, React Server Components
• TypeScript - Full type safety
• AI SDK - The AI Toolkit for TypeScript
• AI Gateway - Unified access to 120+ AI models
• Better Auth - Authentication & authorization
• Drizzle ORM - Type-safe database queries
• PostgreSQL - Primary database
• Redis - Caching & resumable streams
• Vercel Blob - Blob storage
• Shadcn/UI - Beautiful, accessible components
• Tailwind CSS - Styling
• tRPC - End-to-end type-safe APIs
• Zod - Schema validation
• Zustand - State management
• Motion - Animations
• t3-env - Environment variables
• Pino - Structured Logging
• Langfuse - LLM observability & analytics
• Vercel Analytics - Web analytics
• Biome - Code linting and formatting
• Ultracite - Biome preset for humans and AI
• Streamdown - Markdown for AI streaming
• AI Elements - AI-native Components
• AI SDK Tools - Developer tools for AI SDK

Monorepo Layout

• apps/site: Landing page (chatjs.dev)
• apps/chat: Next.js chat app (demo.chatjs.dev)
• apps/docs: Mintlify docs (chatjs.dev/docs)
• packages/cli: interactive scaffold CLI

Development

• bun dev:chat: run chat app
• bun dev:docs: run docs
• bun lint: run workspace lint
• bun test:types: run chat app typecheck

License

Apache-2.0