stacktrace.js v2.0 is out, featuring ES6 support, better stack frames, and more!
This guide breaks down why these tools don't exist, how to spot dangerous scams, and what official "viewer" tools Facebook actually provides. 1. Does a Legitimate Profile Viewer Exist?
If you have already tried a third-party "Facebook Profile Viewer," assume your account is compromised. Take these steps immediately:
reveals performance metrics (like profile visits and reach) but only as aggregate numbers , never specific names. The Risk of the "Stalker Tracker"
Elias knew better. He worked in IT; he knew these were scams. They were phishing attempts designed to steal credentials or malware disguised as a feature that Facebook would never actually allow. Logic told him to close the tab.
: You can see what your profile looks like to strangers by using the tool in your profile settings. 4. Summary Table of Viewer Features Shows Names? Availability Profile Views Never allowed Facebook Stories Visible for 24 hours Professional Insights No (Numbers only) Requires Professional Mode Third-Party Apps Risk of account theft Are you trying to secure your profile from unwanted visitors, or were you looking for analytics for a business page
More than meets the eye
5 tools in 1!
stacktrace.js - instrument your code and generate stack traces
stacktrace-gps - turn partial code location into precise code location
In version 1.x, We've switched from a synchronous API to an asynchronous one using Promises because synchronous ajax calls are deprecated and frowned upon due to performance implications.
All methods now return stackframes. This Object representation is modeled closely after StackFrame representations in Gecko and V8. All you have to do to get stacktrace.js v0.x behavior is call .toString() on a stackframe.
Use Case: Give me a trace from wherever I am right now
var error = new Error('Boom');
printStackTrace({e: error});
==> Array[String]
v1.x:
var error = new Error('Boom');
StackTrace.fromError(error).then(callback).catch(errback);
==> Promise(Array[StackFrame], Error);
If this is all you need, you don't even need the full stacktrace.js library! Just use error-stack-parser!
ErrorStackParser.parse(new Error('boom'));
Use Case: Give me a trace anytime this function is called
Instrumenting now takes Function references instead of Strings.
v0.x:
function interestingFn() {...};
var p = new printStackTrace.implementation();
p.instrumentFunction(this, 'interestingFn', logStackTrace);
==> Function (instrumented)
p.deinstrumentFunction(this, 'interestingFn');
==> Function (original)
v1.x:
function interestingFn() {...};
StackTrace.instrument(interestingFn, callback, errback);
==> Function (instrumented)
StackTrace.deinstrument(interestingFn);
==> Function (original)
Facebook Profile Viewer In Facebook File
.parseError()
Error: Error message
at baz (http://url.com/file.js:10:7)
at bar (http://url.com/file.js:7:17)
at foo (http://url.com/file.js:4:17)
at http://url.com/file.js:13:21
Parsed Error
.get()
function foo() {
console.log('foo');
bar();
}
function bar() {
baz();
}
function baz() {
function showTrace(stack) {
var event = new CustomEvent('st:try-show', {detail: stack});
document.body.dispatchEvent(event);
}
function showError(error) {
var event = new CustomEvent('st:try-error', {detail: error});
document.body.dispatchEvent(event);
}
StackTrace.get()
.then(showTrace)
.catch(showError);
}
foo();
StackTrace output
Facebook Profile Viewer In Facebook File
This guide breaks down why these tools don't exist, how to spot dangerous scams, and what official "viewer" tools Facebook actually provides. 1. Does a Legitimate Profile Viewer Exist?
If you have already tried a third-party "Facebook Profile Viewer," assume your account is compromised. Take these steps immediately:
reveals performance metrics (like profile visits and reach) but only as aggregate numbers , never specific names. The Risk of the "Stalker Tracker"
Elias knew better. He worked in IT; he knew these were scams. They were phishing attempts designed to steal credentials or malware disguised as a feature that Facebook would never actually allow. Logic told him to close the tab.
: You can see what your profile looks like to strangers by using the tool in your profile settings. 4. Summary Table of Viewer Features Shows Names? Availability Profile Views Never allowed Facebook Stories Visible for 24 hours Professional Insights No (Numbers only) Requires Professional Mode Third-Party Apps Risk of account theft Are you trying to secure your profile from unwanted visitors, or were you looking for analytics for a business page
Facebook Profile Viewer In Facebook File
Turn partial code location into precise code location
This library accepts a code location (in the form of a StackFrame) and returns a new StackFrame with a more accurate location (using source maps) and guessed function names.
Usage
var stackframe = new StackFrame({fileName: 'http://localhost:3000/file.min.js', lineNumber: 1, columnNumber: 3284});
var callback = function myCallback(foundFunctionName) { console.log(foundFunctionName); };
// Such meta. Wow
var errback = function myErrback(error) { console.log(StackTrace.fromError(error)); };
var gps = new StackTraceGPS();
// Pinpoint actual function name and source-mapped location
gps.pinpoint(stackframe).then(callback, errback);
//===> Promise(StackFrame({functionName: 'fun', fileName: 'file.js', lineNumber: 203, columnNumber: 9}), Error)
// Better location/name information from source maps
gps.getMappedLocation(stackframe).then(callback, errback);
//===> Promise(StackFrame({fileName: 'file.js', lineNumber: 203, columnNumber: 9}), Error)
// Get function name from location information
gps.findFunctionName(stackframe).then(callback, errback);
//===> Promise(StackFrame({functionName: 'fun', fileName: 'http://localhost:3000/file.min.js', lineNumber: 1, columnNumber: 3284}), Error)
Simple, cross-browser Error parser. This library parses and extracts function names, URLs, line numbers, and column numbers from the given Error's stack as an Array of StackFrames.
Once you have parsed out StackFrames, you can do much more interesting things. See stacktrace-gps.
Note that in IE9 and earlier, Error objects don't have enough information to extract much of anything. In IE 10, Errors are given a stack once they're thrown.