Topic

Express.js LLM Backend Integration

13 posts on express.js llm backend integration — part of api integration on the n4n AI blog.

Structuring an Express.js project for an LLM SaaS backend

Practical guide to designing an Express.js project structure for LLM SaaS backends: layering, service isolation, streaming, metering, and fallback.

July 17, 20263 min read

API integrationHow-to

Rate limiting an Express LLM API with express-rate-limit

Step-by-step guide to implementing express.js rate limiting express-rate-limit on an Express LLM API proxy, including middleware code and load tests for production.

July 17, 20264 min read

API integrationHow-to

How to proxy OpenAI-compatible requests through Express

Step-by-step guide to building an Express.js proxy for OpenAI-compatible APIs: handle streaming, inject API keys, add CORS, and verify with real requests.

July 17, 20263 min read

API integrationHow-to

How to cache LLM responses in Express with Redis

Step-by-step guide to express.js cache llm responses redis: build a Redis-backed caching layer for LLM calls in Express with runnable code.

July 17, 20263 min read

API integrationHow-to

How to add request logging to an Express LLM API

Learn how to implement express.js request logging llm api middleware to capture latency, token usage, and errors in your Node.js LLM proxy service.

July 17, 20263 min read

API integrationComparison

Express.js vs Fastify for building LLM-backed APIs

A hands-on comparison of Express.js vs Fastify for LLM-backed APIs: streaming, latency, ergonomics, ecosystem, and which to choose for your use case.

July 17, 20265 min read

API integrationGuide

Express.js error handling for upstream LLM provider failures

Practical guide to express.js error handling llm provider failures: structured errors, retries, timeouts, circuit breakers, and gateway offload.

July 17, 20264 min read

API integrationGuide

Express middleware for LLM API key authentication

A practical guide to building Express.js middleware for LLM API key authentication: scoped keys, rotation, rate limits, and safe proxying to LLM gateways.

July 17, 20264 min read

API integrationHow-to

Deploying an Express LLM backend with PM2

Step-by-step how-to for an express.js deploy pm2 llm backend: initialize Node app, add OpenAI-compatible proxy route, run under PM2 cluster mode, and validate.

July 17, 20263 min read

API integrationTutorial

Building a WebSocket chat server with Express and ws

A practical, step-by-step tutorial for building an express.js websocket chat server ws with Express and the ws library, plus LLM integration.

July 17, 20262 min read

API integrationHow-to

Streaming LLM responses from Express with res.write

Learn how to implement express.js res.write llm streaming in Node.js to pipe tokens from an LLM API to the browser with backpressure and error handling.

July 16, 20264 min read

API integrationTutorial

Building an LLM-powered Express.js API from scratch

Hands-on express.js llm api tutorial: build a streaming OpenAI-compatible chat backend in Node.js with Express, including error handling and rate limits.

July 16, 20263 min read

API integrationTutorial

Building a RAG API with Express.js and pgvector

Step-by-step tutorial for building an Express.js RAG API with pgvector: ingest text, store embeddings in Postgres, and serve LLM answers via similarity search.

July 16, 20262 min read