How to Build a REST API with NestJS

From zero to a production-ready NestJS API - the architecture that handles real traffic.

NestJS is opinionated enough to prevent the most common Node.js architectural mistakes, but flexible enough to adapt to any domain. This guide covers the module structure, validation patterns, authentication setup, and error handling that make a NestJS API production-ready from day one.

No fluff. Production-grade answers from engineers who build this every day.

Why NestJS Over Plain Express?

Express is flexible. That flexibility is its weakness at scale: every team ends up reinventing dependency injection, validation, and error handling in slightly different ways. NestJS provides these as framework primitives. The practical benefits: TypeScript-first, built-in dependency injection, module system that maps naturally to bounded contexts, decorator-based validation, and a testing story that doesnt require mocking the entire framework.

At Valletta Software, we focus on:

Module structure: feature modules (UserModule AuthModule) - not a flat file dump

Controllers: thin - HTTP in DTO out nothing else. No business logic in controllers

Services: business logic call repositories or external APIs return domain objects

DTOs with class-validator: validate at the entry point - never trust raw req.body

TypeORM / Prisma: repository pattern typed entities migrations in version control

Authentication: @nestjs/passport plus JWT with guards - not middleware

Error handling: HttpExceptionFilter plus domain exceptions - consistent error responses

The Production Checklist Before You Ship

The things tutorials skip that bite you in production.

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Helmet: security headers - one line always on

Rate limiting: @nestjs/throttler - protect every public endpoint

Request logging: Morgan or custom interceptor - log method path status duration

Health endpoints: /health for load balancer checks - liveness plus readiness

Swagger: @nestjs/swagger decorators - auto-generated always in sync

Environment validation: Joi schema at startup - crash on missing required env vars

Graceful shutdown: SIGTERM handler stop accepting new requests before process exit

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How to Build a REST API with NestJS - With Engineers Who Build These in Production

Our Node.js engineers build NestJS APIs with feature modules typed DTOs JWT auth Swagger docs and health endpoints from the first sprint.

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Our Node.js engineers build NestJS APIs with feature modules, typed DTOs, JWT auth, Swagger docs, and health endpoints from the first sprint.

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