JSON Formatter
Free online JSON formatter and validator. Beautify, minify, and fix messy JSON instantly in your browser — no data ever leaves your device.
How to use the JSON Formatter
- Paste or type your JSON into the input box on the left (or click Load sample to try it).
- Click Beautify to pretty-print it, or Minify to strip whitespace.
- If your JSON is invalid, the status line shows the exact error so you can fix it.
- Use Copy or Download to grab the formatted result.
Frequently asked questions
Is my JSON data uploaded anywhere?
No. All formatting and validation happens locally in your browser using JavaScript. Your data never leaves your device.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks to make JSON easy to read. Minify removes all unnecessary whitespace to make the file as small as possible — useful for production.
Why does it say my JSON is invalid?
Common causes are trailing commas, single quotes instead of double quotes, missing brackets, or comments (standard JSON does not allow comments). The error message points to the position where parsing failed.
Can it handle large JSON files?
Yes, within your browser’s memory limits. Very large files (tens of MB) may take a moment to process.