The validator parses your payload, highlights the exact character that failed, and confirms when the structure is safe to ship. It understands comments, numbers, booleans, and nested arrays the same way modern runtimes do.
Instant feedback loop
Paste JSON and get a green “valid” state or a descriptive error message that points to the line and column that caused the issue.
Fast iteration workflow
Use it while editing configuration files, API fixtures, or CI templates. The validator runs locally so you can use it even when you are offline.
When it earns its keep
- Validate configuration files before pushing to Git
- Ensure API mocks are syntactically correct
- Confirm user-provided JSON before importing it into a database
Questions people ask
Does it support comments?
It follows the official JSON specification which does not allow comments. Remove inline comments before validation.
Why is validation local?
Keeping everything in-browser means sensitive payloads never leave your machine.