LangChain + Next.js Starter Template

Use it when

• You are starting an LLM chat app in Next.js and do not want to hand-wire streaming, structured output, agents, and RAG routes from scratch
• You want a free-tier-friendly reference showing how LangChain.js modules compose with Vercel AI SDK streaming and edge functions before building your own app

What it solves

Not the fit when

• Python LangChain projects
• production-ready SaaS scaffolding with auth and payments
• non-Next.js frontends
• not a production app; retrieval demos require setting up Supabase yourself and the agent demo needs a SerpAPI key
• does not cover auth, billing, or multi-user concerns
• JS/TS only; not a template for Python LangChain

Install

git clone https://github.com/langchain-ai/langchain-nextjs-template && cd langchain-nextjs-template && cp .env.example .env.local (add OPENAI_API_KEY) && yarn

Invoke

yarn dev, then open http://localhost:3000 and chat; backend logic lives in app/api/chat/route.ts

Alternatives

No reviewed alternatives recorded yet.