100% local processing - your files and data never leave your browser.
No accounts, no tracking - we don't save your credentials, files, or usage.
Free forever - donations are welcomed, but every tool is and always will be free.
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FREE TOOL - VALIDATE JSON - NO UPLOAD

JSON
FORMATTER

Paste messy JSON and instantly pretty-print, minify, sort keys, and validate it locally in your browser.

Format JSON - Free All 114 Tools
{bad:true,items:[1,2]}{"ok": true,"items": [1, 2]}
Pretty Print
Turn compact JSON into readable, indented code.
Validate
Catch parse errors with line and column hints.
Minify
Compress JSON into one line for transport.
Sort Keys
Normalize object key order for easier diffs.
Stats
See objects, arrays, keys, and size at a glance.
Private
Everything runs locally in your browser.
The Tool

FORMAT JSON

Paste JSON on the left. Clean output appears on the right.

json-format.php - readyLIVE

Input

Output

Waiting for JSON...
0objects
0arrays
0keys
0bytes
Process

HOW IT WORKS

Parse, clean, and copy valid JSON.

01
Paste JSON
Add raw API output, config, or logs.
02
Format or minify
Choose readable or compact output.
03
Copy clean output
Use valid JSON wherever you need it.
FAQ

COMMON QUESTIONS

No. Parsing and formatting happen in your browser.

It validates and shows errors. It will not guess unsafe fixes.

Yes, but very large files depend on browser memory.

It recursively sorts object keys alphabetically.

Yes. Use the Minify button for compact one-line output.

Yes. Parsed JSON values are serialized without changing their meaning.
Accent colour
Custom