JSON Schema Validator
Validate JSON data against JSON Schema (draft-07) online. Get detailed error messages with paths, types, and constraints. Free client-side JSON Schema validator.
Why Use a JSON Schema Validator?
JSON Schema provides a powerful way to define the structure and constraints of your JSON data. A validator checks whether your data conforms to the schema, catching type mismatches, missing required fields, out-of-range values, and other issues. Our tool supports draft-07 features and runs entirely in your browser.
Key Features
- Supports JSON Schema draft-07: type, properties, required, items, enum, pattern, format, and more
- Auto-validate toggle for instant feedback as you type
- Detailed error messages with JSON path and value context
- Pre-loaded sample schema and data for quick demo
- Supports anyOf, oneOf, allOf, and not combinators
How It Works
- Paste your JSON data in the left textarea
- Paste your JSON Schema (draft-07) in the right textarea
- Enable auto-validate or click the Validate button
- Review the validation result and any error details
Technical Details
This validator implements a subset of JSON Schema draft-07 specification entirely client-side in JavaScript. It performs recursive validation through nested objects and arrays, supports all common constraint keywords, and reports errors with precise JSON paths.
Frequently Asked Questions
What JSON Schema version does this support?
This validator supports JSON Schema draft-07 features including type checking, properties, required fields, items, enum, pattern, format validation, minimum/maximum, minLength/maxLength, anyOf, oneOf, allOf, not, and additionalProperties.
What format validations are supported?
Supported format validations include email, uri/url, date, date-time, ipv4, ipv6, uuid, and hostname.
Does this send my data to a server?
No. All validation happens entirely in your browser. Your JSON data and schema never leave your device.
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