langchain-ai/chat-langchain

github.com/langchain-ai/chat-langchain ↗

Python

20 environment variables found in .env.example

Set these on your host before deploying. Each platform has an “Environment Variables” section in the deploy flow. (showing first 20, more exist in .env.example)

ANTHROPIC_API_KEY secret LLM Provider API Keys (at least one required)
OPENAI_API_KEY secret
GOOGLE_API_KEY secret
BASETEN_API_KEY secret
PYLON_API_KEY secret Pylon Knowledge Base
PYLON_KB_ID
LANGCHAIN_TRACING_V2 LangSmith for tracing and monitoring
LANGSMITH_API_KEY secret
LANGSMITH_PROJECT
NEXT_PUBLIC_SUPABASE_URL Frontend Optional Login (Supabase Auth) Used by frontend/ to mimic support portal LangSmith account login. The app still works without…
NEXT_PUBLIC_SUPABASE_ANON_KEY secret
NEXT_PUBLIC_SUPABASE_EU_URL
NEXT_PUBLIC_SUPABASE_EU_ANON_KEY secret
NEXT_PUBLIC_SUPABASE_APAC_URL
NEXT_PUBLIC_SUPABASE_APAC_ANON_KEY secret
NEXT_PUBLIC_SUPABASE_AWS_URL
NEXT_PUBLIC_SUPABASE_AWS_ANON_KEY secret
SUPABASE_URL Used by identity.py (MDA) to validate Supabase access tokens.
SUPABASE_ANON_KEY secret
SUPABASE_EU_URL

Best match Fly.io Anything Dockerized — requires the Fly CLI.

macOS

brew install flyctl && fly launch --from https://github.com/langchain-ai/chat-langchain

Linux

curl -L https://fly.io/install.sh | sh && fly launch --from https://github.com/langchain-ai/chat-langchain

Windows (PowerShell)

iwr https://fly.io/install.ps1 -useb | iex; fly launch --from https://github.com/langchain-ai/chat-langchain

Alternative Deploy on Railway Apps that need Postgres, Redis, or background workers.

Or deploy to a different host

Render Full-stack with managed Postgres + Redis. DigitalOcean App Platform Containers, droplets, and managed services.

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