JSON Formatter

Pretty-print, minify, and validate JSON documents client-side.

Privacy: 100% Client-Side. Your data never leaves this browser tab. Processing uses Web APIs and client-side libraries only.
Local History: ON

Input persists in localStorage and syncs to #data= for shareable links (small payloads).

{
  "hello": "Utilxo",
  "ok": true
}

What does the JSON formatter do?

API payloads and config blobs are often minified or invalid. A local formatter helps you pretty-print, minify, and catch syntax errors quickly.

This tool processes JSON in your browser so sensitive payloads do not need to be pasted into an online black box.

How to use this tool

  1. Paste JSON into the editor.
  2. Pretty-print, minify, or validate until the document is well-formed.
  3. Copy the result into your API client, fixture, or config file.

Frequently asked questions

Is JSON uploaded?

No. Formatting and validation are client-side only.