Validate and get actual line number of the stacktrace using source map

sourcemap-checker.js

//
// Purpose:
//
// To validate the source map
// To get actual line number of the stack trace
//
// Usage:
// You need to do following
//
// 1. Copy the source map to the directory where you have this script.
// 2. Change source map file in the `fs.readFile` method.
// 3. Install source-map package
//      npm install source-map
// 4. Specify the minified line number and column number and 'Save'
// 5. Run the script
//      node sourcemap-checker.js
//

var sourcemap = require('source-map'),
    fs = require('fs');

fs.readFile('./myscript.min.js.map', 'utf8', function (err, rawSourceMap) {

  if (err) {
    return console.log(err);
  }

  var smc = new sourcemap.SourceMapConsumer(rawSourceMap);

  // List all sources
  console.log(smc.sources);

  console.log(smc.originalPositionFor({
    line: 4,        // Specify minified file line number
    column: 275     // Specify minified file column number
  }));

});