What errors can the JSON validator detect?

It detects missing commas, unquoted keys, trailing commas, unclosed brackets, incorrect data types, and all standard JSON syntax violations.

Is the JSON validator free?

Yes, completely free with no account needed.

The tool requires an internet connection to load, but all validation happens locally in your browser.

JSON Validator & Lint

Instantly find errors in your JSON data. Get clear feedback on syntax issues and ensure your data is perfectly formatted.

JSON Code Source

Linter Ready

Instantly identifies missing commas, quotes, brackets, and other common JSON syntax errors that break APIs.

Instead of generic "Invalid JSON", get descriptive messages that point you directly to the cause of the failure.

Ensure your config files and API payloads meet the RFC 8259 standard for JSON data interchange format.