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🚀 CLI
npm i -g @nestjs/cli
nest new project-name
nest generate module users
nest generate controller users
nest generate service users
nest build
nest start
nest info
🏗️ Module
import { Module } from '@nestjs/common';

@Module({
  imports: [],
  controllers: [UsersController],
  providers: [UsersService],
})
export class UsersModule {}
🎮 Controller
import { Controller, Get, Post, Body, Param } from '@nestjs/common';

@Controller('users')
export class UsersController {
  @Get()
  findAll() { /* ... */ }

  @Get(':id')
  findOne(@Param('id') id: string) { /* ... */ }

  @Post()
  create(@Body() dto: CreateUserDto) { /* ... */ }
}
⚙️ Service
import { Injectable } from '@nestjs/common';

@Injectable()
export class UsersService {
  findAll() { /* ... */ }
  findOne(id: string) { /* ... */ }
  create(dto: CreateUserDto) { /* ... */ }
}
🛡️ Provider & Dependency Injection
@Injectable()
export class MyProvider {}

@Module({
  providers: [MyProvider],
})
export class AppModule {}
🗄️ DTO & Validation
import { IsString, IsInt } from 'class-validator';

export class CreateUserDto {
  @IsString()
  name: string;

  @IsInt()
  age: number;
}
🔒 Middleware
import { Injectable, NestMiddleware } from '@nestjs/common';

@Injectable()
export class LoggerMiddleware implements NestMiddleware {
  use(req, res, next) {
    console.log('Request...');
    next();
  }
}
🧩 Pipe
import { PipeTransform, Injectable } from '@nestjs/common';

@Injectable()
export class ParseIntPipe implements PipeTransform {
  transform(value: string) {
    return parseInt(value, 10);
  }
}
🛑 Exception Filter
import { ExceptionFilter, Catch, ArgumentsHost, HttpException } from '@nestjs/common';

@Catch(HttpException)
export class HttpErrorFilter implements ExceptionFilter {
  catch(exception: HttpException, host: ArgumentsHost) {
    // handle exception
  }
}
🏃 Lifecycle Hook
import { OnModuleInit, Injectable } from '@nestjs/common';

@Injectable()
export class AppService implements OnModuleInit {
  onModuleInit() {
    // Called once module is initialized
  }
}
🔗 Routing & Params
@Get(':id')
findOne(@Param('id') id: string) { /* ... */ }

@Post()
create(@Body() dto: CreateUserDto) { /* ... */ }
📦 Configuration
npm i @nestjs/config

// app.module.ts
import { ConfigModule } from '@nestjs/config';
@Module({
  imports: [ConfigModule.forRoot()],
})
🗃️ Database (TypeORM Example)
npm i @nestjs/typeorm typeorm sqlite3

// app.module.ts
import { TypeOrmModule } from '@nestjs/typeorm';
@Module({
  imports: [TypeOrmModule.forRoot()],
})
🧪 Testing
npm run test
npm
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