NestJS

@nestjs main.ts

 import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
 
async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  await app.listen(3000);
}
bootstrap(); import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
 
async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  await app.listen(3000);
}
bootstrap();

Bootstrap our application
Main module definition
Port
And more...

@nestjs Controllers

 import { Controller, Get } from '@nestjs/common';
 
@Controller('plants')
export class PlantsController {
  @Get()
  findAll(): string {
    return 'This action returns all plants';
  }
} import { Controller, Get } from '@nestjs/common';
 
@Controller('plants')
export class PlantsController {
  @Get()
  findAll(): string {
    return 'This action returns all plants';
  }
}

Use classes and decorators
Incoming requests
Returning responses
CRUD

@nestjs Providers

 import { Injectable } from '@nestjs/common';
import { Plant } from './interfaces/plant.interface';
 
 
@Injectable()
export class PlantsService {
  private readonly plants: Plant[] = [];
 
  create(plant: Plant) {
    this.plants.push(plant);
  }
  //..
} import { Injectable } from '@nestjs/common';
import { Plant } from './interfaces/plant.interface';
 
 
@Injectable()
export class PlantsService {
  private readonly plants: Plant[] = [];
 
  create(plant: Plant) {
    this.plants.push(plant);
  }
  //..
}

Use classes and decorators
Point of contact with the data
Injected as dependency

 constructor(private catsService: CatsService) {}

@nestjs Modules

 import { Module } from '@nestjs/common';
import { PlantsController } from './plants.controller';
import { PlantsService } from './plants.service';
 
@Module({
  controllers: [PlantsController],
  providers: [PlantsService],
  exports: [PlantsService],
})
export class PlantsModule {} import { Module } from '@nestjs/common';
import { PlantsController } from './plants.controller';
import { PlantsService } from './plants.service';
 
@Module({
  controllers: [PlantsController],
  providers: [PlantsService],
  exports: [PlantsService],
})
export class PlantsModule {}

Use classes and decorators
Organize the application structure
Controllers / Providers / Exports

@nestjs ...

 @Injectable()
export class LoggerMiddleware implements NestMiddleware {
  use(req: Request, res: Response, next: NextFunction) {
    console.log('Request...');
    next();
  }
} @Injectable()
export class LoggerMiddleware implements NestMiddleware {
  use(req: Request, res: Response, next: NextFunction) {
    console.log('Request...');
    next();
  }
}

Middleware

 @Get(':id')
async findOne(@Param('id', ParseIntPipe) id: number) {
  return this.catsService.findOne(id);
} @Get(':id')
async findOne(@Param('id', ParseIntPipe) id: number) {
  return this.catsService.findOne(id);
}

Pipes

Pipes

Guards
Interceptors
...

	npm install -g @nestjs/cli
	nest new my-nest-project

	// OR

	npx @nestjs/cli new my-nest-project

	.
	\|-- node_modules
	\|-- src
	\| \|-- app.controller.ts
	\| \|-- app.module.ts
	\| \|-- app.service.ts
	\| `-- main.ts
	\|-- nest-cli.json
	\|-- package.json
	\|-- tsconfig.json
	`-- .eslintrc.js

	.
	\|-- node_modules
	\|-- src
	\| \|-- app.controller.ts
	\| \|-- app.module.ts
	\| \|-- app.service.ts
	\| `-- main.ts
	\|-- nest-cli.json
	\|-- package.json
	\|-- tsconfig.json
	`-- .eslintrc.js

Emmanuel DEMEY

Aurélien LOYER

NestJS

You all already know NestJS or have heard of them!

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NestJS

overview in

~10 minutes !!

Nest (NestJS) is a framework for building efficient, scalable Node.js server-side applications

@nestjs/cli

@nestjs/cli new app

@nestjs/cli new app

@nestjs/cli --help

@nestjs Project Structure

@nestjs main.ts

@nestjs Controllers

@nestjs Providers

@nestjs Modules

@nestjs ...

	import { NestFactory } from '@nestjs/core';
	import { AppModule } from './app.module';

	async function bootstrap() {
	const app = await NestFactory.create(AppModule);
	await app.listen(3000);
	}
	bootstrap();

	import { Controller, Get } from '@nestjs/common';

	@Controller('plants')
	export class PlantsController {
	@Get()
	findAll(): string {
	return 'This action returns all plants';
	}
	}

	import { Injectable } from '@nestjs/common';
	import { Plant } from './interfaces/plant.interface';


	@Injectable()
	export class PlantsService {
	private readonly plants: Plant[] = [];

	create(plant: Plant) {
	this.plants.push(plant);
	}
	//..
	}

	import { Module } from '@nestjs/common';
	import { PlantsController } from './plants.controller';
	import { PlantsService } from './plants.service';

	@Module({
	controllers: [PlantsController],
	providers: [PlantsService],
	exports: [PlantsService],
	})
	export class PlantsModule {}

	@Injectable()
	export class LoggerMiddleware implements NestMiddleware {
	use(req: Request, res: Response, next: NextFunction) {
	console.log('Request...');
	next();
	}
	}

	@Get(':id')
	async findOne(@Param('id', ParseIntPipe) id: number) {
	return this.catsService.findOne(id);
	}