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Free JSON Schema Validator - Validate JSON Against Schema Online
Validate JSON Data with JSON Schema - Support Draft-07, Draft-06, and More
JSON Schema Validator
Free online JSON schema validator supporting 700+ schemas and 5 draft versions. Validate JSON instantly with detailed error reports - perfect for API testing and configuration validation.
How to Validate JSON with Schema - Step by Step Guide
Validate your JSON data against schemas in 3 simple steps with support for 700+ predefined schemas and all major draft versions
1
Step 1 – Select or Input Your JSON Schema
Access the web's largest JSON schema library - Choose from 700+ predefined schemas from SchemaStore.org (like package.json, tsconfig.json) or paste your custom JSON Schema. The validator supports Draft-04, Draft-06, Draft-07, Draft 2019-09, and Draft 2020-12.
700+ Predefined Schemas: Access popular schemas from SchemaStore.org including package.json, tsconfig.json, docker-compose.yml, and many more
Custom Schema Input: Paste your own JSON Schema or upload a schema file for validation against your specific requirements
Schema Self-Validation: Automatically validates your schema itself to ensure it's a valid JSON Schema before using it to validate data
Example Schema
{
"$schema": "http://json-schema.org/draft-07/schema#",
"title": "User Registration",
"type": "object",
"required": [
"username",
"email",
"age"
],
"properties": {
"username": {
"type": "string",
"minLength": 3,
"maxLength": 20,
"pattern": "^[a-zA-Z0-9_]+$"
},
"email": {
"type": "string",
"format": "email"
},
"age": {
"type": "integer",
"minimum": 18,
"maximum": 120
},
"country": {
"type": "string",
"enum": [
"USA",
"UK",
"Canada",
"Australia"
]
}
}
}2
Step 2 – Input JSON Data for Validation
Test API payloads, configuration files, or any JSON data in seconds - Paste your JSON data or upload a JSON file to validate against the schema. The validator provides real-time feedback with detailed error messages showing exactly what doesn't match the schema.
Real-time Validation: Instant validation feedback as you type or paste data with clear success/error indicators
Precise Error Location: Errors show exact property paths and line numbers to help you quickly identify issues
Multiple Input Methods: Paste JSON directly, upload files, or use sample data to test the validation process
Auto Validate→Real-time
Example Data
{
"username": "john_doe",
"email": "[email protected]",
"age": 25,
"country": "USA"
}3
Step 3 – Review Validation Results & Fix Errors
Save hours of debugging with pinpoint error messages - Get detailed validation results with comprehensive error messages. Each error includes the property path, failed constraint, and helpful messages to guide you in fixing issues.
Clear Success Indicator: Visual confirmation when data passes validation with summary of validated properties
Detailed Error Reports: Comprehensive error list showing property path, constraint type, and expected vs actual values
Fix Suggestions: Helpful error messages with guidance on how to correct validation failures
Valid Data Example
✅ Validation successful - All properties match the schema
{
"username": "john_doe",
"email": "[email protected]",
"age": 25,
"country": "USA"
}Invalid Data Example
/username
/email
/age
/country
JSON Schema Validator FAQs
Common questions about validating JSON with schemas
JSON Schema validation verifies whether a JSON document conforms to a defined JSON Schema. The schema specifies the structure, data types, required fields, and validation rules that your data must satisfy. This ensures data consistency across APIs, configuration files, and applications.
Yes, this JSON schema validator is 100% free with no registration, no ads, and no usage limits. Validate unlimited JSON documents against schemas—completely free forever. All validation runs in your browser, so your data stays private and secure.
All JSON schema validation runs 100% locally in your browser using client-side JavaScript. Your JSON data and schemas never leave your device—no uploads, no server processing, no data collection. This ensures complete privacy, security, and instant validation speed.
We integrate with SchemaStore.org to provide 700+ ready-to-use JSON schemas for popular tools and frameworks. Validate package.json, tsconfig.json, docker-compose.yml, ESLint configs, GitHub Actions workflows, and many more without writing schemas from scratch. Simply select a template and start validating.
Yes! This tool is perfect for API validation. Use JSON Schema to define your API request/response contracts, then validate payloads against the schema. Supports REST APIs, GraphQL, webhooks, and microservices. Catch data format errors before they reach production.
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