RapidCheck

JSON Formatter & Validator

Format, beautify, minify and validate JSON.

Last updated: 25 Aug 2026

Quick answer

Paste JSON and click Format to pretty-print it with indentation, or Minify to strip whitespace. If the JSON is invalid, the error is shown. Everything runs in your browser — nothing is uploaded.

Format, minify and validate JSON instantly. Paste your JSON, then beautify it with indentation or minify it — all locally in your browser.

How to format JSON

  1. 1 Paste your JSON.
  2. 2 Click Format to beautify or Minify to compact it.
  3. 3 Copy the result; invalid JSON shows an error.

Frequently asked questions

What does the JSON formatter do?
It parses your JSON and re-prints it with clean indentation, or compacts it, and flags syntax errors.
Is my JSON sent to a server?
No — parsing and formatting happen entirely in your browser.
Why is my JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes, or unquoted keys.

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