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)

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!
         alert(trace.join('\n\n'));
    }
    ... more code of yours ...
</script>

Bookmarklet available on the project home page.

You can also pass in your own Error to get a stacktrace not available in IE or Safari 5-

var lastError;
try {
    // error producing code
} catch(e) {
   lastError = e;
   // do something else with error
}

if (lastError) {
    // Returns stacktrace from lastError!
    var trace = printStackTrace({e: lastError});
    alert('Error!\n' + 'Message: ' + lastError.message + '\nStack trace:\n' + trace.join('\n'));
}

Note that error message is not included in stack trace.

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

function logStackTrace(stack) {
    console.log(stack.join('\n'));
}
var p = new printStackTrace.implementation();
p.instrumentFunction(this, 'baz', logStackTrace);

function foo() {
    var a = 1;
    bar();
}
function bar() {
    baz();
}
foo(); //Will log a stacktrace when 'baz()' is called containing 'foo()'!

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

It is currently tested and working on:

• Firefox (and Iceweasel) 0.9+
• Google Chrome 1+
• Safari 3.0+ (including iOS 1+)
• Opera 7+
• IE 5.5+
• Konqueror 3.5+
• Flock 1.0+
• SeaMonkey 1.0+
• K-Meleon 1.5.3+
• Epiphany 2.28.0+
• Iceape 1.1+

This project is made possible due to the efforts of these fine people:

• Eric Wendelin
• Luke Smith
• Loic Dachary
• Johan Euphrosine
• Øyvind Sean Kinsey
• Victor Homyakov