JSON Formatter & Validator

Format, validate, and minify JSON. All processing happens in your browser.

Indent:
Input JSON
Output

Format JSON

Pretty-print JSON with customizable indentation (2 or 4 spaces). Makes nested structures easy to read.

Validate JSON

Real-time JSON validation as you type. Highlights syntax errors with descriptive messages.

Minify JSON

Remove all whitespace and compress JSON to the smallest possible size for production use.

How to Use the JSON Formatter

  1. 1. Paste your JSON string into the Input JSON panel on the left.
  2. 2. Click Format to pretty-print with your chosen indent size (2 or 4 spaces).
  3. 3. Click Minify to strip all whitespace for compact production output.
  4. 4. The Valid / Invalid badge shows real-time syntax validation as you type.
  5. 5. Click Copy to copy the formatted output to your clipboard.

Frequently Asked Questions

What is a JSON formatter?

A JSON formatter (also called a JSON beautifier) takes compact or unformatted JSON and adds indentation and line breaks to make it human-readable. It is essential for debugging API responses, config files, and data exports.

What does JSON validation check for?

JSON validation checks for syntax errors: mismatched braces/brackets, missing commas, unquoted keys, trailing commas, and invalid data types. This tool shows the exact error message so you can fix issues quickly.

What is JSON minification?

JSON minification removes all whitespace (spaces, tabs, newlines) that is not part of string values, producing the smallest possible file size. Use minified JSON in production APIs and config bundles to reduce bandwidth.

Is my JSON data sent to a server?

No. All formatting, validation, and minification is done locally in your browser using JavaScript. Your data never leaves your device.