JSON Validator
Paste JSON and click Validate to check the syntax. Invalid JSON returns the error message with line and column number.
How JSON Validation Works
ParseJSON validates JSON using the browser’s native JSON.parse(). Modern browsers (Chrome, Firefox, Safari, Edge) include position information in the error message — ParseJSON extracts and displays the line and column where the problem starts.
Because different browser engines format error messages differently, ParseJSON normalizes the output so you always get a clear, actionable message regardless of which browser you’re using.
What Gets Validated
- Correct JSON syntax (RFC 8259 / ECMA-404)
- Matching braces and brackets
- Double-quoted keys and string values
- No trailing commas
- No comments
- Valid number, boolean, and null literals
Related Tools
- JSON Formatter — format and validate together
- Common JSON Errors Guide — fix typical mistakes