JSON Schema Validator
Validate JSON data against a schema with type checking, required fields, patterns, enums, and detailed error reporting.
JSON Schema
JSON Data
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Everything you need to know
Free JSON Schema Validation
Paste your JSON Schema in one pane and your JSON data in the other, then click Validate. The tool checks your data against the schema and reports every validation error with the exact JSON path and a clear description of what went wrong. This is invaluable for debugging API contracts, configuration files, and data pipelines.
Comprehensive Validation Rules
The validator supports a wide range of JSON Schema keywords: type checking for all JSON types including integer, required properties, enum and const constraints, string length and regex patterns, numeric ranges and multiples, array item validation with min/max counts and uniqueness, and object property restrictions including additionalProperties. This covers the most common validation scenarios you will encounter in practice.
Detailed Error Reporting
When validation fails, the tool shows every error with the exact JSON path (like $.users[0].email) and a human-readable description. This makes it easy to find and fix data issues, especially in deeply nested structures with many properties. Pass/fail status is clearly indicated with color-coded results.
Sample Schemas
Get started quickly with built-in sample schemas for common patterns: User Profile (with email pattern validation), Product List (with array and nested object validation), and API Response (with enum status codes). Each sample loads both a schema and matching test data.
Related Developer Tools
Format JSON data with the JSON Formatter, compare JSON documents with the Diff Checker, or encode data with the Base64 Encoder.