NestJS Crash Course
Build a Task Management REST API in 1 hour with NestJS, PostgreSQL, and Prisma.
ជំពូកនេះមិនទាន់ត្រូវបានបកប្រែជាភាសាខ្មែរនៅឡើយទេ — សូមអានជាភាសាអង់គ្លេសខាងក្រោម។
This is a free, self-contained crash course that builds one complete project from start to finish: a Task Management REST API, using NestJS, PostgreSQL, and Prisma. By the end you'll have a working, validated, documented API — and understand the relationship between Module → Controller → Service → Prisma → PostgreSQL.
It's for developers who are brand new to NestJS, or who've only skimmed the official docs. No prior production backend experience assumed.
What you'll build
GET /tasks
GET /tasks/:id
POST /tasks
PATCH /tasks/:id
DELETE /tasks/:id
A single tasks feature module, backed by a real PostgreSQL database via Prisma, with request validation, proper HTTP error responses, and a live Swagger UI to try it all from the browser.
Source code and video
The full source code, including the finished project in its final state, is available on GitHub: nestjs-crash-course-2026.
- 01Setup & Project CreationInstall the NestJS CLI, scaffold a new project, and understand the four building blocks of a Nest app.
- 02ModulesGroup related code into a feature module and wire it into the app.
- 03Controllers & RoutingHandle the five task routes with decorators, route params, and request bodies.
- 04Services & Dependency InjectionMove business logic into an injectable service the controller calls into.
- 05DTOs & ValidationValidate incoming request bodies with DTOs, class-validator, and a global ValidationPipe.
- 06Database Integration (Prisma + PostgreSQL)Replace the in-memory array with a real PostgreSQL database using Prisma.
- 07Error HandlingReturn proper HTTP error responses with NestJS's built-in exception classes.
- 08API Documentation with SwaggerDocument the API and try it live from the browser with Swagger UI.
- 09Architecture ReviewReview the finished project structure, the request lifecycle, and what to learn next.