JSON Formatter & Validator
Turn compact JSON into readable data, reduce it for transport, or find syntax problems before they reach your application.
Output
What is this tool?
The formatter parses JSON using the browser's native parser, then rebuilds it with consistent two-space indentation. Minify removes unnecessary whitespace without changing the data.
How to use
- Paste JSON into the input.
- Choose Format, Minify, or Validate.
- Review any syntax message below the output.
- Copy the result when ready.
Example
{"active":true,"items":[1,2]} becomes a multi-line, indented object when formatted.
FAQ
Does formatting change values?
No. It changes whitespace only, although insignificant number notation may be normalized by JavaScript.
Why is my JSON invalid?
Common causes include trailing commas, single quotes, comments, or missing quotation marks around keys.
Is my JSON stored?
No. Input stays in the current browser tab.