Tools PlatformOne Platform. Many Tools.

JSON Formatter / Validator

Paste JSON to pretty-print, minify, or validate it — errors show the exact line and position.

Loading tool…

How to use

  1. Paste or type your JSON into the input.
  2. Click Format to beautify, or Minify to compact it.
  3. Copy the output — invalid JSON shows the exact error location.
JSON DiffCompare two JSON documents and see exactly what changed — keys, values, structure.
Text CompareCompare two texts and see exactly what changed — by word, line, or character.
Base64 Encode / DecodeEncode and decode Base64 with correct UTF-8 handling.
Regex TesterTest regular expressions live with match highlighting, flags, and capture groups.

Frequently asked questions

What happens if my JSON is invalid?

You'll see a clear message with the exact line and position of the problem, so you can fix it fast.

Is my data sent anywhere?

No. Parsing and formatting run entirely in your browser — nothing is transmitted.

Can it handle large JSON files?

Yes, within your browser's memory. Very large files may take a moment to render.

About this tool

JSON Formatter / Validator is a free, browser-based tool from Tools Platform. It runs entirely on your device — your data is never uploaded to a server, so it stays completely private. There are no accounts, no watermarks, and no limits. Paste JSON to pretty-print, minify, or validate it — errors show the exact line and position.