JSON Formatter and Validator
Use this free online JSON formatter to validate, pretty print and minify JSON in your browser. Paste any JSON on the left and view clean formatted or compact minified JSON on the right.
All processing happens locally in your browser so your data never leaves your device. This makes the tool safe for working with API payloads, configuration files, logs and other sensitive JSON.
How to use this JSON formatter
Paste or type your JSON into the input box on the left. Choose Format JSON to pretty print the JSON with indentation, which is useful for debugging or code review. Choose Minify JSON to remove all unnecessary whitespace and line breaks to produce a compact string that is ideal for APIs, environment variables or storage.
Common questions
What does this JSON validator check?
The validator checks that the input is valid JSON according to the JSON specification. If the input contains syntax errors such as missing quotes, trailing commas or unmatched brackets the tool will show an error message.
Is my JSON data sent to a server?
No. All parsing and formatting happens in your browser using JavaScript. The JSON you paste never leaves your device which makes this tool suitable for sensitive or internal data.
When should I format versus minify JSON?
Use formatted JSON when you need readability, for example while debugging or reviewing a payload. Use minified JSON when size matters, such as when sending data over a network or storing it in configuration files.