Javascript backtrace

Question

How to I get a backtrace in Javascript?

Ideal features:

entry function name, or some meaningful identifier for anonymous functions,
argument list at each level,
line numbers.

Can this be done in standard ECMAScript?

If not, can it be done in the common web browser dialects?

Thanks.

Edit --

Thanks for your suggestions.

My dialect doesnot support arguments.caller or arguments.callee.

I can do this:

try {
    let x = null;
    x .foo ();
}
catch (e) {
        debug (dump (e.stack));
}

Which gets me the information as a string, which is okay for at-a-glance, but it would be a great help to walk e.stack. Does it have a standard form?

Thanks again.

The best way to get strack traces is to use browser based debuggers. — Raynos, Jul 22 '11 at 09:04
It's a proprietry dialect, seems mostly complete, has a few extentions. — spraff, Jul 22 '11 at 11:01

linzuojian · Answer 1 · 2019-06-06T07:47:50.380

39

In my debugging experience, I always use this

(function () { console.log(new Error().stack); })();

As the comments below suggested, the readers should prefer: console.log(new Error().stack);

edited Jun 06 '19 at 07:47

answered Jun 10 '15 at 03:22

linzuojian

602
6
8

5

Why the extra function wrapper? can't you just use `console.log(new Error().stack);`? It worked for me. – Daniel Tonon Aug 30 '17 at 02:15
1

I don't see any reason for the wrapper function either – Timo Huovinen Jun 15 '18 at 13:19
1

I like clean global scope. So I add a wrapper. – linzuojian Feb 28 '19 at 09:00
Adding the wrapper function obviously adds an extra function (pointlessly?) to top of the stack, making the code you care about one step down. I recommend readers don't do this, idk if the poster had a reason for wanting it this way so I won't change the answer. – DanielM Apr 25 '19 at 09:52

score 9 · Answer 2 · answered Mar 07 '20 at 14:23

9

Another way is to use console.trace();

source: https://developer.mozilla.org/en-US/docs/Web/API/Console/trace

answered Mar 07 '20 at 14:23

Lafif Astahdziq

3,788
29
38

score 3 · Answer 3 · answered Jan 10 '18 at 12:35

3

This lib: stacktrace-js works anywhere, not only with errors.

Example:

StackTrace.get()
    .then(stack => { console.log(stack) })
    .catch(err => { console.log(err) });

answered Jan 10 '18 at 12:35

paul.ago

3,904
1
22
15

Javascript backtrace

Edit --

3 Answers3

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