NestJS Cheat Sheet

A single-page NestJS reference for decorators, module metadata, request pipeline pieces, and CLI commands used throughout this course.

How to Use This Cheat Sheet

Use the tables below as a lookup while building. Each entry maps to deeper lessons earlier in the course.

nest g resource cats
# module + controller + service + DTO stubs

The Nest CLI remains the fastest way to scaffold consistent feature files.

middleware -> guards -> interceptors(pre) -> pipes -> handler -> interceptors(post) -> filters(on error)

Controllers map HTTP; services hold logic; modules wire DI.
Pipes validate/transform; guards authorize; interceptors wrap; filters format errors.
Config and secrets come from ConfigModule.
Test with TestingModule and Supertest.

Most-used Nest decorators.

Decorator	Purpose
`@Module()`	Declare module metadata
`@Controller()`	HTTP controller
`@Injectable()`	Provider participating in DI
`@Get/Post/Patch/Delete()`	Route handlers
`@Body/@Param/@Query()`	Input extraction
`@UseGuards/@UsePipes/@UseInterceptors/@UseFilters()`	Attach pipeline pieces

Field	Meaning
`imports`	Other modules whose exported providers you need
`controllers`	HTTP/GraphQL controllers/resolvers registered here
`providers`	Injectable classes owned by this module
`exports`	Providers shared with importing modules

Command	Purpose
`nest new`	Scaffold project
`nest g module\|controller\|service`	Generate building blocks
`nest g resource`	CRUD resource scaffold
`nest build`	Compile to dist
`nest start --watch`	Dev watch mode

This sheet compresses Nest decorators, module fields, pipeline order, and CLI commands.
Use it for recall, then return to deeper lessons when needed.
Pipeline order explains many surprising bugs.

Pro Tip

Pin this page and the official Nest docs side by side—cheat sheets help memory; docs settle version-specific details.