Paste JSON to beautify, minify, or validate it. Syntax errors are highlighted with exact line numbers. All processing runs in your browser — no data sent anywhere.
Paste ugly, minified, or broken JSON and get it back clean. Three modes: Beautify (proper indentation, line breaks), Minify (compress to one line), and Validate (find syntax errors with exact line numbers). All processing happens in your browser — nothing sent to a server.
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. It is commonly used for API responses and configuration files.
Yes. The formatter will alert you if your JSON contains syntax errors, such as missing commas, unquoted keys, or trailing commas.
Yes. Besides pretty-printing with indentation, the tool can also minify (compact) JSON by removing all unnecessary whitespace.
No. All formatting and validation happen directly in your browser. Your JSON data never leaves your device.
Standard JSON does not support comments. If your file contains comments, it is technically not valid JSON. Consider removing comments or using JSONC format.