Topic

NestJS LLM API Integration

12 posts on nestjs llm api integration — part of api integration on the n4n AI blog.

Validate chat completion requests with NestJS DTOs

Learn how to implement nestjs dto chat completion validation for LLM APIs using class-validator and NestJS pipes, with step-by-step code and verification.

July 17, 20262 min read

API integrationHow-to

Unit testing a NestJS OpenAI client with Jest mocks

Learn how to build a nestjs jest mock openai client to unit test your LLM service without network calls, covering chat, streaming, and errors step by step.

July 17, 20263 min read

API integrationGuide

Type-safe NestJS controllers for streaming chat

A practical guide to building a nestjs typed streaming chat controller with TypeScript, SSE, and OpenAI-compatible APIs—covering pitfalls and patterns.

July 17, 20262 min read

API integrationHow-to

Retry and timeout logic for NestJS OpenAI API calls

Implement production-grade NestJS OpenAI API retry and timeout logic with Axios: step-by-step setup, exponential backoff, idempotency, and tests.

July 17, 20263 min read

API integrationHow-to

Rate limit LLM calls in NestJS with @nestjs/throttler

Learn how to implement nestjs throttler llm rate limiting in a NestJS app to protect LLM proxy routes from abuse, upstream limits, and cost spikes.

July 17, 20262 min read

API integrationTutorial

Queue long LLM completions with NestJS and BullMQ

Learn how to build a robust NestJS BullMQ LLM queue to offload long-running completions, with step-by-step code and real output for production.

July 17, 20262 min read

API integrationGuide

NestJS microservice pattern for multi-provider LLM routing

Practical guide to implementing a NestJS microservice pattern for multi-provider LLM routing with fallback, metering, and cache control.

July 17, 20263 min read

API integrationGuide

NestJS dependency injection for pluggable LLM providers

Practical guide to building pluggable LLM providers in NestJS using dependency injection, with interfaces, factories, and runtime selection.

July 17, 20263 min read

API integrationHow-to

Log token usage with a NestJS interceptor

Learn how to build a NestJS interceptor to log LLM token usage from OpenAI-compatible responses, with step-by-step code and verification tips for observability.

July 17, 20264 min read

API integrationHow-to

Stream LLM responses in NestJS using server-sent events

Learn how to implement nestjs server-sent events llm streaming end to end, from controller setup to OpenAI-compatible client and verification.

July 16, 20263 min read

API integrationHow-to

Handle OpenAI 429 rate limit errors in NestJS

Practical guide to nestjs openai 429 error handling: implement retries, exponential backoff, global exception filters, and provider fallback in production NestJS apps.

July 16, 20262 min read

API integrationTutorial

Build an OpenAI-compatible chat endpoint in NestJS

Hands-on tutorial to build a nestjs openai compatible chat endpoint with NestJS: request DTOs, provider proxying, streaming, and curl tests.

July 16, 20262 min read