Is there a way to match a compressed javascript stack trace with a source map to pinpoint the correct error message?

Question

Is there a way to match a compressed javascript stack trace with a source map to pinpoint the correct error message?

When managing our production server, I have implemented minified javascript without including a map file to prevent users from easily deciphering errors.

To handle angular exceptions caught by $exceptionHandler, I developed a logging service that forwards the stack traces to my email. Unfortunately, the stack trace provided is difficult to read:

n is not defined
    at o (http://localhost:9000/build/app.min.js:1:3284)
    at new NameController (http://localhost:9000/build/app.min.js:1:3412)
    at e (http://localhost:9000/build/bower.min.js:44:193)
    at Object.g.instantiate (http://localhost:9000/build/bower.min.js:44:310)
    at b.$get (http://localhost:9000/build/bower.min.js:85:313)
    at d.compile (http://localhost:9000/build/bower.min.js:321:23333)
    at aa (http://localhost:9000/build/bower.min.js:78:90)
    at K (http://localhost:9000/build/bower.min.js:67:39)
    at g (http://localhost:9000/build/bower.min.js:59:410)
    at http://localhost:9000/build/bower.min.js:58:480 <ui-view class="ng-scope">

I am curious if there is a tool available that can match this stack trace with the original non-minified source code using a map file or another method.

javascript angularjs minify

Answer 1

Answer №1

Realizing there was a lack of simple tools available for converting a minified stack trace to a readable one using a source map without relying on a web service, I decided to create my own solution:

https://github.com/mifi/stacktracify

To get started, simply install the tool by running the following command:

npm install -g stacktracify

Once installed, copy your minified stack trace to your clipboard and execute the following command:

stacktracify /path/to/js.map

Answer 2

Realizing there was a lack of simple tools available for converting a minified stack trace to a readable one using a source map without relying on a web service, I decided to create my own solution:

https://github.com/mifi/stacktracify

To get started, simply install the tool by running the following command:

npm install -g stacktracify

Once installed, copy your minified stack trace to your clipboard and execute the following command:

stacktracify /path/to/js.map

Answer 3

Answer №2

To uncover the hidden gems of source code, one must dive into the world of source maps. Forget about web browsers - all you need is to decode the minified references into their full-bodied counterparts.

If you're familiar with NodeJS, there's a handy package waiting for you to make this task a breeze.

https://github.com/mozilla/source-map/

First, install the library by running:

npm install -g source-map

or

yarn global add source-map

Next, craft a file named "issue.js"

fs = require('fs');
var sourceMap = require('source-map');
var smc = new sourceMap.SourceMapConsumer(fs.readFileSync("./app.min.js.map","utf8"));
console.log(smc.originalPositionFor({line: 1, column: 3284}));

Execute the script using node:

node issue.js

Voilà! The console will unveil the original file location corresponding to the first line from the stack trace.

Just a tip: I recommend installing source-map globally for convenience, but feel free to incorporate it directly into your Node project for a more localized approach.

Answer 4

To uncover the hidden gems of source code, one must dive into the world of source maps. Forget about web browsers - all you need is to decode the minified references into their full-bodied counterparts.

If you're familiar with NodeJS, there's a handy package waiting for you to make this task a breeze.

https://github.com/mozilla/source-map/

First, install the library by running:

npm install -g source-map

or

yarn global add source-map

Next, craft a file named "issue.js"

fs = require('fs');
var sourceMap = require('source-map');
var smc = new sourceMap.SourceMapConsumer(fs.readFileSync("./app.min.js.map","utf8"));
console.log(smc.originalPositionFor({line: 1, column: 3284}));

Execute the script using node:

node issue.js

Voilà! The console will unveil the original file location corresponding to the first line from the stack trace.

Just a tip: I recommend installing source-map globally for convenience, but feel free to incorporate it directly into your Node project for a more localized approach.

Answer 5

Answer №3

Expanding on the solution provided by @Reactgular, the following code snippet is compatible with the most recent version of source-map.

  const rawSourceMap = fs.readFileSync("./app.min.js.map","utf8");

  const whatever = sourceMap.SourceMapConsumer.with(rawSourceMap, null, consumer => {
    console.log(consumer.originalPositionFor({
      line: 1,
      column: 3284
    }));
  });

In addition to the conversation in the thread, a basic regex like /\/(\w*[-\.]?\w*).js:\d*:\d*/g can be used.

Here is a straightforward regex to identify all line numbers in a stack trace.

  //regex for patterns like utils.js, utils123.js, utils-name.js, utils.version.js
  var patt = /\/(\w*[-\.]?\w*).js:\d*:\d*/g; 
  // returns matches like ['/app.min.js:1:3284', '/bower.min.js:44:193', ..]
  var errorPositions = line.match(patt);
  console.log(errorPositions);
  if(!errorPositions || errorPositions.length === 0) {
      console.log("No error line numbers detected in the file. Ensure your stack trace file is proper");
      return;
  }
  errorPositions.forEach(function(error) {
    findInSourceMap(error);
  });
});

Answer 6

Expanding on the solution provided by @Reactgular, the following code snippet is compatible with the most recent version of source-map.

  const rawSourceMap = fs.readFileSync("./app.min.js.map","utf8");

  const whatever = sourceMap.SourceMapConsumer.with(rawSourceMap, null, consumer => {
    console.log(consumer.originalPositionFor({
      line: 1,
      column: 3284
    }));
  });

In addition to the conversation in the thread, a basic regex like /\/(\w*[-\.]?\w*).js:\d*:\d*/g can be used.

Here is a straightforward regex to identify all line numbers in a stack trace.

  //regex for patterns like utils.js, utils123.js, utils-name.js, utils.version.js
  var patt = /\/(\w*[-\.]?\w*).js:\d*:\d*/g; 
  // returns matches like ['/app.min.js:1:3284', '/bower.min.js:44:193', ..]
  var errorPositions = line.match(patt);
  console.log(errorPositions);
  if(!errorPositions || errorPositions.length === 0) {
      console.log("No error line numbers detected in the file. Ensure your stack trace file is proper");
      return;
  }
  errorPositions.forEach(function(error) {
    findInSourceMap(error);
  });
});

Answer 7

Answer №4

If you were able to access the source map file from an external source and maintain the same file structure, you might be able to figure it out with some effort. However, as far as I know, there aren't any tools outside of the browser that can assist with this.

One added benefit of having the data within a live browser environment is the ability to check locals, which isn't possible even with a source map.

Consider using a tool like rollbar for error reporting. This tool will provide detailed reports of all locals in each frame to aid in debugging. It also offers support for utilizing sourcemaps outside of the browser to address security concerns.

Answer 8

If you were able to access the source map file from an external source and maintain the same file structure, you might be able to figure it out with some effort. However, as far as I know, there aren't any tools outside of the browser that can assist with this.

One added benefit of having the data within a live browser environment is the ability to check locals, which isn't possible even with a source map.

Consider using a tool like rollbar for error reporting. This tool will provide detailed reports of all locals in each frame to aid in debugging. It also offers support for utilizing sourcemaps outside of the browser to address security concerns.

Answer 9

Answer №5

If you're struggling with reading stack traces, I've developed a handy web tool just for that - check it out at .

All you have to do is paste your stack trace and upload your source maps, then the tool will display the "original" stack trace for you.

And best of all, this tool runs directly in your browser and is completely free to use.

Answer 10

If you're struggling with reading stack traces, I've developed a handy web tool just for that - check it out at .

All you have to do is paste your stack trace and upload your source maps, then the tool will display the "original" stack trace for you.

And best of all, this tool runs directly in your browser and is completely free to use.

Answer 11

Answer №6

Include a comment directive in your JavaScript code for referencing the source map file.

//# sourceMappingURL=/path/to/your/sourcemap.map

In Firefox (not certain about Chrome), you can enable source maps by clicking on the "Debugger settings" button and choosing "Show original sources" from the settings menu that appears:

Answer 12

Include a comment directive in your JavaScript code for referencing the source map file.

//# sourceMappingURL=/path/to/your/sourcemap.map

In Firefox (not certain about Chrome), you can enable source maps by clicking on the "Debugger settings" button and choosing "Show original sources" from the settings menu that appears:

Is there a way to match a compressed javascript stack trace with a source map to pinpoint the correct error message?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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