JSON formatter

Beautify, minify, sort keys, validate — with live preview.

Features

Real-time validation highlights syntax errors with line and column numbers.
Sort-keys mode alphabetizes every object's keys for consistent, diff-friendly output.
Minify mode strips all whitespace to produce the smallest possible JSON string.

How it works

Paste or type any JSON into the input pane — syntax errors are flagged inline as you type.
Choose indent size (2 spaces, 4 spaces, tab), toggle minify or sort-keys mode.
The formatted output updates live; copy it to clipboard or download as a .json file.

Your files never leave this page

Every conversion runs entirely in your browser using WebAssembly. There is no upload, no server-side processing, no analytics, and no cookies. Open DevTools → Network during the operation and you will see zero outbound traffic.

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Topics covered

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sort json keys
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