這篇文章主要介紹了nestjs返回給前端數據格式的封裝實現,文中通過示例代碼介紹的非常詳細,對大家的學習或者工作具有一定的參考學習價值,需要的朋友們下面隨著小編來一起學習學習吧
一般開發過程中不不會根據httpcode來判斷接口請求成功與失敗的,而是會根據請求返回的數據,里面加上code字段
一、返回的數據格式對比
1、直接返回的數據格式
{
"id": 1,
"uuid": "cbbe7abc-b95e-48a0-8d24-b1ac93c45328",
"name": "哈士奇1",
"age": 12,
"color": null,
"createAt": "2019-07-25T09:13:30.000Z",
"updateAt": "2019-07-25T09:13:30.000Z"
}2、我們自己包裝后的返回數據
{
code: 0,
message: "請求成功",
data: {
"id": 1,
"uuid": "cbbe7abc-b95e-48a0-8d24-b1ac93c45328",
"name": "哈士奇1",
"age": 12,
"color": null,
"createAt": "2019-07-25T09:13:30.000Z",
"updateAt": "2019-07-25T09:13:30.000Z"
}
}二、攔截全部的錯誤請求,統一返回格式
1、使用命令創建一個過濾器
nest g f filters/httpException
2、過濾器的代碼
import {
ArgumentsHost,
Catch,
ExceptionFilter,
HttpException,
HttpStatus,
Logger,
} from '@nestjs/common';
@Catch(HttpException)
export class HttpExceptionFilter implements ExceptionFilter {
catch(exception: HttpException, host: ArgumentsHost) {
const ctx = host.switchToHttp();
const response = ctx.getResponse();
const request = ctx.getRequest();
const message = exception.message.message;
Logger.log('錯誤提示', message);
const errorResponse = {
data: {
error: message,
}, // 獲取全部的錯誤信息
message: '請求失敗',
code: 1, // 自定義code
url: request.originalUrl, // 錯誤的url地址
};
const status =
exception instanceof HttpException
? exception.getStatus()
: HttpStatus.INTERNAL_SERVER_ERROR;
// 設置返回的狀態碼、請求頭、發送錯誤信息
response.status(status);
response.header('Content-Type', 'application/json; charset=utf-8');
response.send(errorResponse);
}
}3、在main.ts中全局注冊
.
..
import { HttpExceptionFilter } from './filters/http-exception.filter';
async function bootstrap() {
...
// 全局注冊錯誤的過濾器
app.useGlobalFilters(new HttpExceptionFilter());
}
bootstrap();4、測試,返回的錯誤信息
{
"statusCode": 400,
"error": "Bad Request",
"data": {
"message": [
{
"age": "必須的整數"
}
]
},
"message": '請求失敗',
"code": 1,
"url": "/api/v1/cat"
}三、統一請求成功的返回數據
1、創建一個攔截器src/interceptor/transform.interceptor.ts
2、攔截器的代碼
import {
Injectable,
NestInterceptor,
CallHandler,
ExecutionContext,
} from '@nestjs/common';
import { map } from 'rxjs/operators';
import { Observable } from 'rxjs';
interface Response<T> {
data: T;
}
@Injectable()
export class TransformInterceptor<T>
implements NestInterceptor<T, Response<T>> {
intercept(
context: ExecutionContext,
next: CallHandler<T>,
): Observable<Response<T>> {
return next.handle().pipe(
map(data => {
return {
data,
code: 0,
message: '請求成功',
};
}),
);
}
}3、全局注冊
...
import { TransformInterceptor } from './interceptor/transform.interceptor';
async function bootstrap() {
...
// 全局注冊攔截器
app.useGlobalInterceptors(new TransformInterceptor());
...
}
bootstrap();4、測試返回數據
{
"data": {
"id": 1,
"uuid": "cbbe7abc-b95e-48a0-8d24-b1ac93c45328",
"name": "哈士奇1",
"age": 12,
"color": null,
"createAt": "2019-07-25T09:13:30.000Z",
"updateAt": "2019-07-25T09:13:30.000Z"
},
"code": 0,
"message": "請求成功"
}





