JSON Formatter
Format, minify and validate JSON data instantly in your browser. Paste messy or minified JSON and get a clean, readable, indented result — or compress it down to a single line.
How to use the JSON Formatter
Paste your JSON into the input box.
Click 'Format' for a readable, indented version, or 'Minify' to compress it to one line.
Invalid JSON shows a clear error message with the problem location.
Use the 'Copy' button to copy the result to your clipboard.
Frequently Asked Questions
Frequently asked questions about the JSON Formatter
Is my JSON data uploaded to a server?+
No. All formatting and validation happens locally in your browser using standard JSON parsing — your data never leaves your device.
What does 'invalid JSON' mean?+
It means the text doesn't follow valid JSON syntax — common causes are trailing commas, missing quotes around keys, or unclosed brackets. The error message points to where parsing failed.
What's the difference between format and minify?+
Format adds indentation and line breaks for readability during development. Minify removes all unnecessary whitespace to reduce file size for production use.