How to output a deep stack trace in node.js?

Question

When a normal exception occurs, a stack trace like the following is outputted:

util.js:38
      case '%s': return String(args[i++]);
                        ^
TypeError: Cannot convert object to primitive value
    at String (unknown source)
    at util.js:38:25
    at String.replace (native)
    at Object.<anonymous> (util.js:35:23)
    at Object.<anonymous> (console.js:25:36)
    at EventEmitter.<anonymous> (/project/src/routines/debug/boot.js:16:21)
    at EventEmitter.emit (/project/node_modules/eventemitter2/lib/eventemitter2.js:319:22)
    at /project/src/bootstrap.js:15:14
    at /project/src/util/routineloader.js:36:11
    at /project/src/util/routineloader.js:47:6

Which is very helpful. When I then do the following somewhere:

process.on('uncaughtException', function(err) {
        console.trace();
        throw err;
    });

I only get:

Trace: 
    at EventEmitter.<anonymous> (/project/src/routines/debug/exceptions.js:4:17)
    at EventEmitter.emit (events.js:88:20)

Which is not helpful at all.

How do I make it return the entire stack trace, like the original one?

possible duplicate of How to print a stack trace in Node.js? — Gábor Imre
– Gábor Imre, Commented Sep 18, 2015 at 11:41

Ryan Roemer · Accepted Answer · 2012-05-10 17:38:53Z

30

You're almost there:

process.on('uncaughtException', function(err) {
  console.log(err.stack);
  throw err;
});

function foo() {
  throw new Error("HI. I'm an error.");
}

foo();

/* Prints
Error: HI. I'm an error.
    at foo (/Users/rye/Desktop/test.js:7:9)
    at Object.<anonymous> (/Users/rye/Desktop/test.js:10:1)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:31)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:479:10)
    at EventEmitter._tickCallback (node.js:192:40)
*/

answered May 10, 2012 at 17:38

Ryan Roemer

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1 Comment

KMA Badshah Over a year ago

DONT STOP HERE! If you need a deeper/longer stack trace than the default one there is a better solution below.

Salketer · Accepted Answer · 2018-01-03 08:49:28Z

8

node --stack_trace_limit=200 your-script.js

edited Jan 3, 2018 at 8:49

Salketer

15.8k2 gold badges32 silver badges64 bronze badges

answered Nov 21, 2015 at 18:00

Trident D'Gao

19.9k22 gold badges101 silver badges169 bronze badges

Comments

John · Accepted Answer · 2017-01-24 05:20:11Z

0

I found that when I used console.log(err) I got the right results so I looked at the api and found the following:

var mystring=require('util').inspect(error_object);

and you'll get the stack trace as a string

answered Jan 24, 2017 at 5:20

John

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