JSON Validator
Validate JSON and check syntax errors. Instant browser-based validation with detailed line and column error reporting. No uploads.
All processing happens locally in your browser. No files are uploaded.
FAQ
- What counts as valid JSON?
- Standard JSON: strings in double quotes, numbers (no NaN or Infinity), booleans, null, arrays, and objects. Trailing commas, comments, and single-quoted strings are invalid.
- What error details are shown?
- You get the line number, column, and a snippet of the input text near the error so you can find and fix the issue quickly.
- Is my data uploaded anywhere?
- No. All validation happens locally in your browser.