All tools
Developer

JSON Formatter

Validate, beautify, or minify JSON.

🔒 Runs entirely in your browser — nothing here is ever uploaded

About the JSON Formatter

Validates, beautifies, or minifies JSON text — catching syntax errors and reformatting valid JSON into either a clean, indented format or a compact single line.

How to use it
  1. Paste or type your JSON input field.
  2. Click Beautify for indented output, or Minify for a compact single line.
  3. Copy the formatted result, or read the error message if it's invalid.
Formula
Uses the browser's built-in JSON parser to validate structure, then re-serializes with either 2-space indentation (beautify) or no whitespace (minify).
Worked example

{"name":"CalcoTools","tools":62} beautifies into a clean multi-line, indented structure, or stays compact when minified.

Recommendations
  • • An 'invalid JSON' error often means a trailing comma, unquoted key, or single quotes — all common but invalid in strict JSON syntax.
  • • Minified JSON is smaller to transmit over a network; beautified JSON is easier for a human to read and debug.
  • • Copy the formatted output directly with the copy button rather than manually selecting text.
Frequently asked questions
Strict JSON requires double-quoted keys and values, no trailing commas, and no comments — JavaScript object syntax allows things JSON doesn't, a common source of confusion.
Related tools
Base64 Encoder / Decoder
Hash Generator
Check Digit Validator
Sources