✎ The Anatomy of Source Maps and Reconstructing Original Source Code

A source map is a .map file that links transformed code back to the original source, allowing browsers to display the original code in debuggers. For bug hunters, this is valuable because it makes reading code easier, reveals developer comments and ... .

Browsers use source maps to reconstruct original code automatically. Similarly, you can use tools like Sourcemapper to retrieve a website’s original source if the .map files are publicly accessible.

sourcemapper -output dhubsrc -url https://target.com/js/client.356c1491.js.map

 
References
• Introduction to JavaScript Source Maps
• Source maps: languages, tools
• Extracting JavaScript from Sourcemaps

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