parse-uuid-list.pipe.ts

import { ArgumentMetadata, BadRequestException, Injectable, PipeTransform } from '@nestjs/common'
import { isUUID } from 'class-validator'

@Injectable()
export class ParseUuidListPipe implements PipeTransform {
  transform(value: any, metadata: ArgumentMetadata): string[] {
    if (typeof value !== 'string') {
      throw new BadRequestException()
    }

    const parts = value.split(',')
    for (const id of parts) {
      if (!isUUID(id, 4)) {
        throw new BadRequestException()
      }
    }

    return parts
  }
}