Source map reader

Load a .map file, then look up a position in minified code or paste a stack trace. Your map and code never leave this page.

Source map file (.map or .json)or paste the map JSON

One position

LineColumn

Stack trace

Mapped trace

This reads the map's "mappings" data directly. Line numbers are 1-based and columns 0-based, as in browser stack traces (which show 1-based columns; the tool adjusts for that in stack traces).