使用拦截器格式化响应数据

创建拦截器文件commom/interceptors/response.interceptor.ts

response.interceptor.ts

import {
  Injectable,
  NestInterceptor,
  ExecutionContext,
  CallHandler,
} from '@nestjs/common';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

export interface ResponseFormat<T = any> {
  code: number;
  message: string;
  data?: T;
}

@Injectable()
export class ResponseInterceptor<T>
  implements NestInterceptor<T, ResponseFormat<T>>
{
  intercept(
    context: ExecutionContext,
    next: CallHandler,
  ): Observable<ResponseFormat<T>> {
    return next.handle().pipe(
      map((data): ResponseFormat<T> => {
        return {
          code: 200,
          message: 'success',
          data: data as T,
        };
      }),
    );
  }
}

main.ts

import { ResponseInterceptor } from './common/interceptor/response.interceptor';
// 全局响应拦截器
app.useGlobalInterceptors(new ResponseInterceptor());