Every NestJS Concept Explained

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10 concept

1. application

   1. http server → NestFactory.create()

   2. microservice application → NestFactory.createMicroservice()

   3. standalone application → NestFactory.createApplicationContext()

2. modules → @Module({})

   1. root module

      1. order (cart,payment)

      2. product

         1. config

3. Decorator → fn → Class,Method

4. Controllers → receive req and return response

   1. @ Controller(““) → root path

   2. @ GET(““) → http verb(get,post,put,delete) → sub root

   3. methods → hello(){} → can add methods to handle incoming req and return res

5. Provider → class that can be injected in other classes as dependency

   1. all logic is written here and is used in controllers

6. req → middlewares → guards → Interceptors → pipes → controller’s route handler → Interceptors → exception filters→ res

7. flow

   1. app.module.ts → feature.module.ts → feature.service.ts(provider→actual logic) → feature.controller.ts(return res→endpoint,http req type(get,post,put,delete))