JSON Formatter & Validator
Paste messy JSON and make it readable — or shrink it down for sending. Format with clean indentation, minify to a single line, or validate and see the exact error when something is wrong. Your data never leaves your browser.
How to use
- Paste your JSON into the input box.
- Click Format to beautify it, Minify to shrink it, or Validate to check it.
- Copy the result or download it as a .json file.
Frequently asked questions
What does Format do?
Format re-prints your JSON with a 2-space indent and one value per line, so nested objects and arrays are easy to read. It does not change any data — only the whitespace.
What does Minify do?
Minify removes all unnecessary whitespace and line breaks, shrinking the JSON to the smallest valid form. That is handy when you need to paste JSON into a URL, a config field, or a small payload.
Why does my JSON fail validation?
The most common causes are trailing commas, single quotes instead of double quotes around keys and strings, unquoted keys, or comments. The status line above the output shows the exact error and the position where the parser stopped.
Is my JSON data private?
Yes. Formatting and validation run entirely in your browser with the built-in JSON parser. Nothing is uploaded, stored, or shared. Use it as a free json formatter online — no signup, nothing to install.
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