Framework cheatsheet

NestJS 11 Cheatsheet

Generate and run NestJS apps, and write controllers, providers, DTO validation, guards, interceptors, configuration and tests.

CLI

Install the Nest CLI — Install the command-line tool globally.
Create a project — Scaffold a new application.
Run in watch mode — Start the app and restart on file changes.
Generate a full resource — Create a module, controller, service, DTOs and entity for a REST resource.
Generate individual parts — Create a module, controller, service, guard, pipe or interceptor.
Build for production — Compile to JavaScript in dist, then run it.

Write a controller — Decorators map methods to routes. Pipes such as ParseIntPipe convert and validate parameters.
Write a provider (service) — @Injectable classes are created and injected by Nest. Throw built-in HTTP exceptions for errors.
Wire things together in a module — A module declares its controllers and providers, and exports what other modules may use.
Provide a value or factory — Register a value, class or factory under a token, for example to inject configuration or fakes.
Load configuration — Make environment variables available everywhere, then inject ConfigService.

Describe and validate a request body — Use class-validator decorators on a DTO class.
Enable validation globally — Validate and transform every request body. whitelist removes properties the DTO doesn't declare.
Protect routes with a guard — A guard decides whether a request may proceed. Throw or return false to deny it.
Run code around handlers — An interceptor can log, transform responses or time requests.
Customize error responses — A filter turns exceptions into the responses you want.
Enable CORS — Allow browser apps on other origins to call the API.
Generate OpenAPI docs — Serve an OpenAPI document and Swagger UI. Install @nestjs/swagger first.

Unit test a service — Build a small testing module with only what the test needs.
Replace a dependency with a fake — Provide a mock in place of the real provider.
Test over HTTP — Start the app in memory and call it with supertest.
Run the tests — Run unit tests, e2e tests and coverage.

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