next.js 使用validatePipe的错误过滤器，自定义错误信息返回

validationException.filter.ts

import {
  BadRequestException,
  ExceptionFilter,
  Catch,
  ArgumentsHost,
} from '@nestjs/common';

import { jsonMsg } from '../common/utils/jsonMsg';
import { ApiCode } from '../common/enums/api-code.enum';

@Catch(BadRequestException)
export class ValidationExceptionFilter
  implements ExceptionFilter<BadRequestException> {
  public catch(exception, host: ArgumentsHost) {
    const ctx = host.switchToHttp();
    const response = ctx.getResponse();
    const { constraints } = exception.message.message.shift();
    const errMsg = [];

    for (const key in constraints) {
      if (constraints.hasOwnProperty(key)) {
        errMsg.push(constraints[key]);
      }
    }

    response.json(jsonMsg(ApiCode.FAILED, errMsg.join(), []));
  }
}