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What is stacktrace.js?

A Javascript tool that allows you to debug your Javascript by giving you a stack trace of function calls leading to an error (or any condition you specify)

How do I use stacktrace.js?

Just include stacktrace.js file on your page, and call it like so:

<script type="text/javascript" src="path/to/stacktrace.js" />
<script type="text/javascript">
    ... your code ...
    if (errorCondition) {
         var trace = printStackTrace();
         //Output however you want!
    ... more code of yours ...

Bookmarklet available on the project home page.

You can also pass in your own Error to get a stacktrace not in IE or Safari, though :(

<script type="text/javascript">
    var lastError;
    try {
        // error producing code
    } catch(e) {
       lastError = e;
       // do something else with error

    // Returns stacktrace from lastError!
    printStackTrace({e: lastError});

Some people recommend just assigning it to window.onerror. Make sure that you have script debugging turned off for IE. Only in IE, FF and Chrome

window.onerror = function(msg, file, line) {

Function Instrumentation

You can now have any (public or privileged) function give you a stacktrace when it is called:

var p = new printStackTrace.implementation();
p.instrumentFunction(this, 'baz', logStackTrace);
function logStackTrace(stack) {
function foo() {
    var a = 1;
function bar() {
foo(); //Will log a stacktrace when 'baz()' is called containing 'foo()'!

p.deinstrumentFunction(this, 'baz'); //Remove function instrumentation

What browsers does stacktrace.js support?

It is currently tested and working on:

  • Firefox (and Iceweasel) 0.9+
  • Google Chrome 1+
  • Safari 3.0+
  • Opera 10+
  • IE 5.5+
  • Konqueror 3.5+
  • Flock 1.0+
  • SeaMonkey 1.0+
  • K-Meleon 1.5.3+
  • Epiphany 2.28.0+
  • Iceape 1.1+

Working (readable, valid stack trace) but not perfectly tested on:

  • Opera 9-
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