JSON Formatter & Validator — Free Online
Free JSON formatter, beautifier, and validator. Pretty-print or minify JSON data instantly.
Input JSON
Output
🔒100% Private — Your files never leave your device. All processing runs locally in your browser.
How It Works
Paste your JSON into the input panel, then click Format to pretty-print it or Minify to compress it. Invalid JSON shows a detailed error message with the exact position of the syntax error.
The formatter uses the browser's native JSON.parse() for validation and JSON.stringify() with configurable indentation for formatting. This ensures 100% spec-compliant parsing — if something is invalid JSON, you'll know exactly where and why.
Features
- ✓Format with 2 or 4 space indentation
- ✓Minify to single line
- ✓Validate JSON and show errors with position
- ✓Copy formatted output
- ✓Monospace code view
⚡Uses the browser's native JSON.parse() — 100% spec-compliant with the ECMA-404 JSON standard.
Perfect For
- →Developers formatting raw API responses for debugging and documentation
- →DevOps engineers validating and formatting JSON configuration files
- →QA testers inspecting API response payloads during testing
- →Data analysts formatting JSON exports from databases and analytics tools
Frequently Asked Questions
Yes — invalid JSON shows a detailed error message.