Free Online JSON Schema Validator
Validate JSON data against a JSON Schema online. Check required fields, types, enums, ranges, string lengths, patterns, arrays, and additional properties. Free and client-side.
100% Client-Side · Your data never leaves your browserHow to Use JSON Schema Validator
Paste your JSON Schema and JSON data, then click Validate. The validator reports whether the data matches the schema and lists each issue with a JSON path.
- Use it to test API payloads, configuration files, and form data.
- Common keywords such as
type,required,properties,enum,minimum,pattern, anditemsare supported. - All validation runs in your browser.
Frequently Asked Questions
What is JSON Schema?
JSON Schema describes the expected structure of JSON data, including fields, types, required values, arrays, and validation constraints.
Is every JSON Schema draft supported?
This tool focuses on common validation keywords for everyday checks. Very advanced draft-specific features may need a dedicated validator.
Is my JSON uploaded?
No. The schema and JSON data are validated locally in your browser.