// limit.pipe.ts

import { ArgumentMetadata, Injectable, PipeTransform } from '@nestjs/common';

​

@Injectable()

export class LimitPipe implements PipeTransform<number, number> {

  /**

* Pipe to check the limit query param is higher than 100, if so limits it to 100.

* @publicApi

*/

  constructor() { }

  transform(value: number, metadata: ArgumentMetadata): number {

    if (metadata.data === 'limit') {

      return value > 100 ? 100 : value;

    }

    return value;

  }

}

​

// in main.ts

async function bootstrap() {

const app = await NestFactory.create(AppModule, { cors });

//...

app.useGlobalPipes(

    new ValidationPipe({

      whitelist: true,

      forbidUnknownValues: true,

      enableDebugMessages: true,

    }),

    new LimitPipe()

  );

//...

}