JSON Formatter & Validator
Format, validate and beautify JSON data instantly in your browser.
Format & Beautify
Pretty-print JSON with configurable indentation for readability.
Validate
Quickly detect JSON syntax errors with helpful messages and locations.
Download & Copy
Copy formatted JSON to clipboard or download as a .json file.
How to use
- Paste or type JSON into the Input JSON box.
- Choose an indent size (2 or 4).
- Click Format to prettify or Minify to compress.
- Use Validate to check for syntax errors before copying or downloading.
FAQ
- Is my data uploaded to the server?
- No — all operations happen in your browser.
- What about very large files?
- Large inputs may slow your browser. Consider using a local tool for very large files.