express.js全局try/catch

问题描述：

我正在使用Express在Node JS上开发一个REST服务器.

I'm developing a rest server on Node JS with Express.

我正在尝试将所有端点包装在try \ catch块中，因此错误的中心点将向发送方发送详细信息. 我的问题是，每个终结点方法都响应(res实例)，但是我不知道如何使其全局.

I'm trying to wrap all my endpoints in try\catch block, so a central point of error will response back to the sender with details. My problem that response (res instance) is alive for each of the endpoints methods, but I don't know how to make it global.

try {
    app.get('/webhook', function (req, res) {
        webhook.register(req, res);
    });

    app.get('/send', function (req, res) {
        sendAutoMessage('1004426036330995');
    });

    app.post('/webhook/subscribe', function (req, res) {
        webhook.subscribe("test");
    });

    app.post('/webhook/unsubscribe', function (req, res) {
        webhook.unsubscribe("test");
    });
} catch (error) {
    //response to user with 403 error and details
}

答

try catch不能异步捕获错误. 这将起作用:

try catch can not catch error asynchronously. This will work:

app.get('/webhook', function (req, res) {
        try { 
          //enter code here
        } catch (error) {
          // something here
        }
    });

但这是本地方法，而不是最佳方法.

But it is local and not the best way.

好的方法是使错误处理中间件功能.它是全球性的.您需要在所有app.use()和路由呼叫之后定义它.

Good way is make error-handling middleware function. It is global. You need to define it after all app.use() and routes calls.

    app.use(function(err, req, res, next) {
      // This is error handler
    });

您可以像往常一样将带有错误详细信息的html页面发送给客户端.

You can send the html page with details of error to client as usual.

此外，默认情况下，Express具有内置的错误处理程序.该错误将通过堆栈跟踪写入客户端(在生产模式下不起作用).

Also, by default, Express have built-in error handler. The error will be written to the client with stack trace (It does not work in production mode).

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