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Free online JSON formatter, validator, and minifier. Works in your browser — no data leaves your device.
Our free JSON formatter tool helps you format, validate, and minify JSON data instantly. Perfect for developers, API testers, and data analysts who need to work with JSON data.
What can this JSON tool do?
It can format (prettify) JSON with custom indentation, minify JSON to reduce size, and validate JSON with detailed error messages including line and column numbers.
Does it support large JSON files?
You can paste up to 500,000 characters (about 500 KB). Everything runs in your browser, so very large, deeply nested documents may take a moment on slower devices.
Is my JSON data secure?
Yes. Your JSON data never leaves your browser. No data is sent to any server, making it safe to use with sensitive or proprietary data.
Can the JSON Formatter fix invalid JSON?
The tool validates your JSON and shows syntax errors with descriptions, but it cannot automatically fix invalid JSON. You will need to correct syntax errors manually based on the error messages provided.
Can I use JSON Formatter on my phone?
Yes, JSON Formatter works on any device with a modern web browser, including smartphones and tablets.
What indentation options are available?
You can choose 2-space, 4-space, or tab indentation for prettified output. The minify option removes all whitespace to produce the smallest possible output.