JSON Validator — Check if JSON is Valid
Validate JSON syntax online. Paste your JSON and see if it is valid — detailed error messages for invalid data.
Paste your JSON and instantly see whether it is valid. Invalid JSON gets a detailed error message pinpointing the exact line and character where the syntax breaks — making debugging API responses and config files much faster.
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
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