Express js - Error handling in middleware

Question

I have a route

 app.get("/some/url/", function(req, res){ res.sendStatus(404) })

I am trying to handle or catch this 404 in express error handling middleware and it is not working

 app.use(function(err, req, res, next){do something here})

Any help how do i capture the error thrown by route in the middleware.

The response is still successfully communicated, regardless of the status code, so Express doesn't consider it an error. You can, however, raise an error yourself – res.sendStatus(404); next(new Error('404 Not found'));. — Jonathan Lonowski
– Jonathan Lonowski, Commented Jun 2, 2016 at 5:02
A little more meaningful and less generic title to your question would be good. — jfriend00
– jfriend00, Commented Jun 2, 2016 at 5:09

Jitendra Khatri · Accepted Answer · 2018-05-28 09:05:26Z

4

app.get("/some/url/", function(req, res) {
    // Generate Error yourself.
    throw new Error("Generated Error.");
});

// global error handler
app.use(function(err, req, res, next) {
    console.dir(err);
    
    if(err) {
        // Your Error Status code and message here.
        res.status(500).send('Something broke!');
    }

    // Send Some valid Response
});

edited May 28, 2018 at 9:05

answered Jun 2, 2016 at 5:10

Jitendra Khatri

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2 Comments

Chen Over a year ago

Just tried your solution, the global error handler was not able to catch the error. It still crashed

Jitendra Khatri Over a year ago

Better if you can share the code and detailed issue.

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