JSON Formatter & Validator
Instantly prettify, validate, and minify JSON data with real-time syntax error highlighting. Works completely offline in your browser.
How to Use the JSON Formatter
Paste JSON
Paste your raw or minified JSON data into the input editor on the left side.
Choose Mode
Click Prettify to format with indentation, or Minify to compress for production. Switch between 2-space and 4-space indent.
Copy or Download
Click Copy to clipboard or Download to save the formatted JSON as a .json file.
Frequently Asked Questions
Is my JSON data sent to any server?
No. All formatting and validation happens inside your browser using JavaScript's native JSON.parse() and JSON.stringify(). Your data never leaves your device.
What's the difference between Prettify and Minify?
Prettify adds human-readable whitespace and indentation so you can read and debug JSON easily. Minify removes all whitespace to reduce file size — ideal for production API responses.
Can this validate nested or complex JSON?
Yes. Our validator uses the browser's native JSON parser which fully supports all valid JSON including nested objects, arrays, null values, unicode strings, and numbers.