Browse Tools Top 100
MAP JSON
Not possible

Convert MAP to JSON

Can you convert MAP to JSON?
Verified by Adam B.· reviewed by FE Editorial ·updated Sep 10, 2026
QUICK ANSWER
Is it possible to convert MAP to JSON?
No - not a direct conversion.

A source map file is plain JSON text starting with { and is parseable by any JSON tool. If the .map extension causes issues in a pipeline, simply rename or copy the file to .json - the content is identical.

No direct path
Also to JSON: BDOB · EXPRESS · REPLIT

On this page

Tested on macOS, Windows & Linux
Last verified Oct 2026

More free converters

HEIC, PNG, WEBP, MP3 and more - every tool here is free.

Open the toolbox

Why convert MAP to JSON?

JavaScript and CSS source maps follow the Source Map v3 specification, which defines them as JSON objects with fields like version, sources, and mappings. The .map extension is a convention, not a distinct binary format - any .JSON parser accepts the file as-is without transformation.

How to convert MAP to JSON

VS Code FREE

Open the .map file in VS Code; it is immediately readable as JSON with syntax highlighting. Rename it to .json if a downstream tool requires that extension.

Notepad++ FREE

Open the .map in Notepad++ to read or edit the JSON content; save a copy with a .json extension if needed.

About these formats

.MAP Source Map (JavaScript / CSS)

A .map file is most often a JavaScript or CSS source map - a JSON file that lets browser DevTools show the original, readable source behind minified or compiled code. You do not open it by…

Open .MAP details →
.JSON JavaScript Object Notation file

A JSON file is a plain-text data file in JavaScript Object Notation format, used by web APIs, app configurations, and data exports. Any text editor opens it - Notepad on Windows, TextEdit…

Open .JSON details →

Quality & what to watch

  • Renaming app.js.map to app.js.json produces a byte-for-byte identical file - no tool parses or transforms anything.
  • The mappings field looks like gibberish because it is VLQ (Base64 Variable-Length Quantity) encoded; all other fields are human-readable JSON.
  • The .map extension is also used by MapInfo GIS files and linker symbol maps - those are not JSON and are unrelated to source maps.

Frequently asked questions

Will any JSON parser accept a `.map` file?
Yes - the content is standard JSON and parses correctly regardless of the file extension.
Why do some sites advertise a MAP-to-JSON converter?
Those entries are auto-generated from file-extension databases and have not been tested; no conversion is performed because the format is already JSON.
What are the key fields inside a source map's JSON?
version (always 3), sources (original file paths), mappings (VLQ-encoded position index), and optionally sourcesContent (embedded original source text).