Tool
JSON Formatter and Validator
Validate, pretty-print, and minify JSON with clear parse error messages.
Developer Tools
What this tool does
Paste JSON to validate syntax, format it for readability, or minify it for production use.
How to use
- Paste raw JSON into the input area.
- Click Format to pretty-print or Minify to compress whitespace.
- Fix any parse errors shown before copying the output.
Examples
Minified to pretty
Input: {"name":"Ada","skills":["math","coding"]}
Output: { "name": "Ada", "skills": [ "math", "coding" ] }
Pretty printing adds indentation for easier reading.
Common use cases
- Debug API responses
- Clean config files before commit
- Validate JSON before importing into apps
FAQ
How do I pretty print JSON?
Paste minified JSON and click Format to add indentation and line breaks.
Does this send my JSON to a server?
No. Formatting and validation run entirely in your browser.
What if my JSON has a syntax error?
The tool shows the parse error message so you can fix the issue before copying output.
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Last reviewed: 2026-05-23