JSON Validator
JSON validator that checks whether a JSON string is syntactically valid and pinpoints the exact line and column of any error. Fix missing commas or quotes in seconds, free in your browser.
JSON is validated automatically as you type.
Embed
What is JSON Validator?
JSON validator that checks whether a JSON string is syntactically valid and pinpoints the exact line and column of any error. Fix missing commas or quotes in seconds, free in your browser.
How to Use
- 1Enter JSON— Paste the JSON string you want to validate into the text input area.
- 2Select Validation Mode— Choose basic mode or detailed mode (duplicate key detection).
- 3View Results— Check the valid/invalid result immediately in the top banner.
- 4Fix Errors— If there are errors, refer to the line number, column number, and error message to fix them.
Related Tools
Frequently Asked Questions
A JSON Validator is a tool that checks whether the entered JSON string follows valid syntax and reports exact error locations and messages.
Basic mode only checks for JSON syntax errors. Detailed mode additionally detects duplicate keys.
The JSON standard (RFC 8259) does not specify how duplicate keys should be handled, so different parsers process them differently. Removing duplicate keys prevents unpredictable behavior.
No. Only standard JSON (RFC 8259) is supported.
No. All validation is performed in the browser and no data is sent to a server.