Langchain Chat
Freeanother Next.js frontend for LangChain Chat. 
FreeFree tier
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About Langchain Chat
LangChain Chat - Next.js is an open-source frontend for LangChain Chat built with Next.js. It provides a chat interface that communicates with a LangChain backend via API routes. The project is deployed at chat.langchain.dev and serves as a demonstrative UI for interacting with LangChain's language model capabilities. The repository includes source code for the Next.js app, with pages, styles, and API routes. It is licensed under MIT and is a popular example in the LangChain ecosystem.
Key Features
Built with Next.js framework
API routes for LangChain backend integration
Deployed at chat.langchain.dev
Open source under MIT license
Easy local setup with npm install and run
Pros & Cons
Pros
- Open source with MIT license
- Simple setup (clone, install, run)
- Uses popular Next.js framework
- Direct integration with LangChain backend
- Active community (1k stars on GitHub)
Cons
- Basic UI with limited customization out of the box
- Requires a separate LangChain backend to function
- Documentation is minimal (mainly README)
Best For
Building custom chat interfaces powered by LangChainPrototyping LangChain-based applicationsLearning LangChain and Next.js integrationSelf-hosting a LangChain chat frontend
FAQ
What is LangChain Chat - Next.js?
It's an open-source Next.js frontend that provides a chat interface for LangChain, allowing users to interact with language models through a web UI.
How do I run it locally?
Clone the repo, run npm install, then npm run dev, and open http://localhost:3000.
Is it free to use?
Yes, the project is open source under the MIT license and is free to use.
Where can I see a live demo?
It is deployed at chat.langchain.dev.