What does 'valid JSON' mean exactly?

Valid JSON follows the RFC 8259 standard: proper quoting, no trailing commas, no JavaScript comments.

Is there a size limit?

No. The validator runs in your browser with no server upload.

JSON Validator

Validate JSON and get a clear error message if it is invalid.

About the JSON Validator

A missing comma or an unquoted key can break an entire API response. Our JSON validator pinpoints the error so you can fix it immediately rather than guessing.

How to use the JSON Validator

Paste your JSON into the input area.
Click Validate. A green tick means valid; a red message shows the exact error.
Fix the error and validate again.

Frequently Asked Questions

What does 'valid JSON' mean exactly?: Valid JSON follows the RFC 8259 standard: proper quoting, no trailing commas, no JavaScript comments.
Is there a size limit?: No. The validator runs in your browser with no server upload.