How to catch a global error with NodeJS

Question

I am getting an unhandled error but not sure where it's coming from. My app has several http.request(options, callback).end() in different methods, with the callback's trapping "uncaughtException" and "error". I'd like to know which of my methods initiated this issue. Below is the error I get. It is random. Any ideas how to track this down? I was hoping for some global way of trapping unhandled errors.

events.js:85
      throw er; // Unhandled 'error' event
            ^
Error: read ECONNRESET
    at exports._errnoException (util.js:746:11)
    at TCP.onread (net.js:559:26)

Elad Nava · Accepted Answer · 2018-09-05 09:07:55Z

25

ECONNRESET means that the other side of the TCP connection is aborted. You could look at the server logs, but since it was random times this makes me think that the server becomes overloaded and kills a few connections.

If you're starting a process at any point in the process try the below:

process.on('uncaughtException', function (err) {
  console.error(err.stack);
  console.log("Node NOT Exiting...");
});

edited Sep 5, 2018 at 9:07

Elad Nava

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answered Dec 9, 2015 at 18:24

Ross The Boss

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1 Comment

user603749 Over a year ago

see my other comment above

AlexD · Accepted Answer · 2015-12-09 18:23:05Z

5

attach a

request.on('error', function(err) {
    // Handle error
});

to your requests.

You can also catch uncaught errors for the process:

process.on('uncaughtException', function(err) {
  console.log('Caught exception: ' + err);
});

This error as it reads states the connection was reset, so its definitely one of the requests.

answered Dec 9, 2015 at 18:23

AlexD

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4 Comments

user603749 Over a year ago

As I state in my posting, already been doing that. I am trying to find out if there is a global catchall errors (kind of like the old days of ON ERROR GOTO :)

AlexD Over a year ago

And your program enters none of them?

user603749 Over a year ago

Nope, does not enter any of them.

AlexD Over a year ago

Try the library request-promise-json, i think it has better error handling, its on top of the default request

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