NestJS Basic Concepts (V 10.X)

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 Main Building Blocks

  • Controller - Handle incoming request
  • Services - Handle business logic
  • Modules - Group together everything
  • Pipes - Validate incoming data
  • Filters - Handle incoming errors
  • Guards - Handle authentication
  • Interceptors - Adding extra data to incoming request or to response
  • Repositories - Handle data stored in DB
How to generate Nest project using Nest CLI?

First, need to install Nest CLI on computer,

npm install -g @nestjs/cli

Then, create a new project using nest new <project_name>

This will generate the boilerplate for the project


The entry point of the application is main.ts file. It is calling main AppModule,


3 files attached with the main.ts,
  • app.module.ts - The entry point
  • app.controller.ts 
  • app.service.ts
Rest of the modules should be included to the AppModule as bellow,





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