Source Map Decoder

Decode line/column positions using a source map locally

Decode minified JavaScript line/column positions with a source map — files read locally, never uploaded.

Also known as: source map resolver · decode sourcemap · map stack trace · original source lookup

100% In-Browser & Private — your data never leaves this device
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How to use the Source Map Decoder

  1. Paste a source map JSON or load a .map file.
  2. Enter minified line and column (or paste a stack frame).
  3. Review the mapped original file, line, column, and source snippet.

FAQ

Do I need the original source files?
The map alone resolves file names and positions; embedded sources in the map enable snippet preview.
Is the source map sent to a server?
No. Decoding runs entirely in your browser.
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