JSON Formatter & Validator
12 toolsFormat, validate, and minify JSON.
Runs in your browser — your files and text stay on your device
Paste JSON to format it with readable indentation, minify it, or find syntax errors. The validator points to what's wrong, such as a trailing comma, single quotes or a missing bracket, so you can fix it quickly. Your data is processed in your browser, which matters for API responses that may contain tokens or personal details.
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Formatted output
How to use this tool
- 1Paste or type your JSON into the Input box.
- 2It's validated and pretty-printed automatically — invalid JSON shows an error.
- 3Click Minify to collapse to a single line, or Copy to grab the formatted output.
Frequently asked questions
What does the error message tell me?
It shows the underlying JavaScript JSON.parse error, usually pointing to the type of problem and its position in the string.
Is my JSON uploaded to a server?
No — parsing and formatting use the browser's built-in JSON.parse/stringify.