JSON Formatter
Format, minify and validate JSON online for free. Clear error messages, one-click copy, and sample JSON to try — everything runs in your browser.
How to use the JSON Formatter
- Paste your JSON into the box.
- Hit Format for readable output, Minify for compact output, or Validate to check it.
- Copy the result with one click.
Frequently Asked Questions
What does the JSON formatter do?
It parses your JSON and reprints it with clean 2-space indentation, so nested data is easy to read. Minify does the opposite — removes all whitespace for the smallest possible file.
Why does my JSON fail to validate?
The usual causes are a trailing comma, single quotes instead of double quotes, or unquoted property names. The error message shows where parsing stopped — fix that spot and try again.
Is my JSON uploaded anywhere?
No. Formatting and validation happen entirely in your browser. Your data never leaves your device.