Free Online JSON Formatter, Validator & Minifier
Format, validate, and minify JSON instantly in your browser. Beautify messy JSON, catch syntax errors, and compress data for APIs — no upload required.
Indent
Paste JSON to format or validate.
Input
Output
Frequently Asked Questions
No. All formatting and validation run entirely in your browser. Your data never leaves your device.
Minifying removes unnecessary whitespace and line breaks so the JSON becomes a compact single line — useful for APIs, storage, or reducing payload size.
No. It validates against the JSON standard and shows clear error messages so you can fix the issue. It does not silently rewrite invalid syntax.
Format and Validate JSON in Seconds
Working with minified or messy JSON from APIs, logs, or config files is painful. Our JSON Formatter beautifies your data with consistent indentation, validates syntax against the JSON standard, and can minify it back down when you need a compact payload.
Built for Developers
Paste JSON, choose your indent size, and format or minify instantly. Syntax errors are reported with a clear message so you can locate and fix problems quickly. Because everything runs client-side, it is fast, private, and ready for everyday debugging and API work.