JSON Formatter & Validator
Format and validate JSON online. Paste your JSON to beautify it, minify it, or check it for errors. Free, instant, no data sent to servers.
What is a JSON formatter?
A JSON formatter (also called a JSON beautifier or pretty-printer) takes compact or unformatted JSON and adds indentation and line breaks to make it human-readable. It also validates the JSON structure and reports any syntax errors. JSON (JavaScript Object Notation) is the standard data format for APIs and web services.
What is the difference between JSON format and minify?
Formatting (beautifying) adds indentation, line breaks, and spacing to make JSON easy to read and edit. Minifying removes all unnecessary whitespace to produce the smallest possible string, which is ideal for network transfer and storage. Both operations preserve the data — only the whitespace changes.
How do I validate JSON?
Paste your JSON into the editor above and click Format. If the JSON is invalid, the tool will display the exact error and line number. Common issues include trailing commas, unquoted keys, and single quotes instead of double quotes.
Is my JSON data sent to a server?
No. All formatting, validation, and minification happens entirely in your browser using JavaScript. Your data never leaves your device.