JSON Formatter. Format, Validate, and Minify.
Paste any JSON and get a properly indented, readable version in one click. The tool validates the syntax and highlights errors inline. Choose 2 or 4 space indentation, or hit Minify to compress back to a single line. Everything runs in your browser and nothing is uploaded.
JSON Formatter
Paste JSON to format, validate, or minify it.
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How it works
Paste your JSON
Paste raw, minified, or malformed JSON into the input field.
See the result
The formatted output appears immediately. Syntax errors are highlighted in the output panel.
Copy or minify
Copy the formatted output to clipboard, or hit Minify to compress it back to a single line.
Frequently asked questions
It takes any valid JSON string and re-serialises it with consistent indentation (2 or 4 spaces) so it is easy to read. It also validates the syntax and shows the first error it encounters if the JSON is invalid.
Minification removes all whitespace and newlines from JSON, reducing file size. Useful before sending JSON in an API request or storing it in a database where size matters.
Common issues include trailing commas (not valid in JSON), single-quoted strings (JSON requires double quotes), missing commas between values, or unquoted keys.
No. The formatting and validation happen entirely in your browser using JavaScript. Nothing is uploaded.