Nodejs 异常处理

局部异常处理

同步代码异常

try{} catch(e){}

异步 Promise 代码异常

Promise.reject().then((e)=>{ })

全局异常处理

process

process.on('uncaughtException',(err)=>{ }) process.on(`unhandledRejection`,(err)=>{ })

Koa

app.use(async (ctx, next) => { try { await next(); } catch (err) { } });

Express

app.use((err, req, res, next) => { // logic })

Nest.js

link

// http-exception.filter.ts @Catch(HttpException) export class HttpExceptionFilter implements ExceptionFilter { catch(exception: HttpException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse<Response>(); const request = ctx.getRequest<Request>(); const status = exception.getStatus(); response .status(status) .json({ statusCode: status, timestamp: new Date().toISOString(), path: request.url, }); } }

Locally

// single route handler @Post() @UseFilters(new HttpExceptionFilter()) async create(@Body() createCatDto: CreateCatDto) { throw new ForbiddenException(); } // every router in controller @UseFilters(new HttpExceptionFilter()) export class CatsController {}

Globally

const app = await NestFactory.create(AppModule); app.useGlobalFilters(new HttpExceptionFilter());

注:

unhandledRejection: 每当 Promise 被拒绝并且在事件循环的一个轮询内没有错误句柄附加到承诺时，则会触发 'unhandledRejection' 事件。link

在 .then(()=>{...}) 或者类似段落中出现的Excpetion且未处理可通过unhandledRejection捕获

在新版本的Nodejs中(15+) Rejection 将会导致程序终止