Browser-only tool
JSON schema validator
Paste JSON data and a schema to check required fields, primitive types, arrays, and objects locally in the browser.
Warning: this is a practical subset validator, not a full JSON Schema implementation. Backend validation is still required.
Privacy And Limitations
Both JSON data and schema are processed locally in your browser and are not uploaded.
- This first version supports a practical subset: type, required, properties, items, enum, and additionalProperties.
- It is not a full replacement for production JSON Schema libraries.
- Do not paste secrets unless you trust the local browser environment.
FAQ
Does this implement every JSON Schema draft feature?
No. It starts with a useful subset and clearly reports unsupported production needs as a limitation.
Is validation server-side?
No. Data and schema are parsed locally in the browser.
Can this replace backend validation?
No. Backend validation remains required for production systems.
What schema features work?
The tool supports type, required, properties, items, enum, and additionalProperties for common checks.
What happens on invalid JSON?
The tool reports a parse error before attempting schema validation.