class-validator

Nestjs

yarn add class-transformer class-validator

main.ts

import { NestFactory } from '@nestjs/core';

import { AppModule } from './app.module';

import { ValidationPipe } from '@nestjs/common'

async function bootstrap() {

  const app = await NestFactory.create(AppModule);

  app.useGlobalPipes(new ValidationPipe({

    disableErrorMessages: true, // 不显示错误信息

    whitelist: true, // 开启过滤

  }))

  await app.listen(5000);

}

bootstrap();

controller

import { signInDto } from './dto/signin.dto'

  @Post('signin')

  signIn(@Body() body: signInDto ){

    l(body)

    return this.appService.signIn(body)

  }

signin.dto.ts

import { IsNotEmpty, Length, IsString } from 'class-validator'

export class signInDto {

  @IsNotEmpty()

  @IsString()

  username: string;

  @IsNotEmpty({

    message: '密码不能为空?'

  })

  @Length(6, 12)

  password: string;

}