JSON Schema Validator
Validate JSON data against JSON Schema specifications with comprehensive error reporting and schema compliance verification.
JSON Schema
JSON Data
💡 Validation Tips
Schema Best Practices
- • Use specific types (string, number, boolean, etc.)
- • Define required properties clearly
- • Add format validation for strings (email, date, etc.)
- • Set appropriate min/max constraints
Common Validation Keywords
- •
type: Data type validation - •
required: Required properties - •
properties: Object property schemas - •
items: Array item schema
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What is JSON Schema Validation?
JSON Schema validation is the process of verifying that JSON data conforms to a predefined schema specification. A JSON Schema defines the structure, data types, constraints, and validation rules that JSON data must follow.
This validation ensures data integrity, consistency, and compliance with expected formats, making it essential for API development, data processing, and configuration management.
Key Features
Schema Compliance
Verify JSON data matches schema specifications
Error Detection
Identify validation errors with precise locations
Type Validation
Check data types, formats, and constraints
Schema Support
Support for JSON Schema Draft 7 and later
Detailed Reports
Comprehensive validation reports with suggestions
Real-time Validation
Instant validation as you type
Common Use Cases
API Development
- • Validate API request/response payloads
- • Ensure data contract compliance
- • Generate API documentation
Data Processing
- • Validate data before processing
- • Ensure data quality and consistency
- • Filter invalid records
Configuration Management
- • Validate configuration files
- • Ensure proper settings format
- • Prevent configuration errors
Data Validation
- • Validate user input forms
- • Check data integrity
- • Enforce business rules
Validation Examples
Example 1: User Profile Schema
JSON Schema:
{
"type": "object",
"properties": {
"name": {
"type": "string",
"minLength": 1
},
"email": {
"type": "string",
"format": "email"
},
"age": {
"type": "integer",
"minimum": 0,
"maximum": 150
}
},
"required": ["name", "email"]
}Valid JSON Data:
{
"name": "John Doe",
"email": "john@example.com",
"age": 30
}Invalid JSON Data:
{
"name": "",
"email": "invalid-email",
"age": -5
}Example 2: API Response Schema
JSON Schema:
{
"type": "object",
"properties": {
"status": {
"type": "string",
"enum": ["success", "error"]
},
"data": {
"type": "array",
"items": {
"type": "object",
"properties": {
"id": {"type": "number"},
"title": {"type": "string"}
},
"required": ["id", "title"]
}
}
},
"required": ["status"]
}Valid Response:
{
"status": "success",
"data": [
{"id": 1, "title": "First Item"},
{"id": 2, "title": "Second Item"}
]
}Frequently Asked Questions
What is JSON Schema?
JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It describes the structure, data types, and constraints that JSON data should follow, enabling automatic validation and documentation.
Which JSON Schema versions are supported?
Our validator supports JSON Schema Draft 7, Draft 2019-09, and Draft 2020-12. The tool automatically detects the schema version based on the $schema property or defaults to the latest supported version.
How do I handle validation errors?
Validation errors include detailed information about the location, expected value, and actual value. Use the error path to locate the problematic data and the error message to understand what needs to be fixed.
Can I validate nested objects and arrays?
Yes, JSON Schema supports complex nested structures. You can define schemas for nested objects using the "properties" keyword and for arrays using the "items" keyword with detailed validation rules.
What validation keywords are supported?
We support all standard JSON Schema keywords including type, properties, required, minimum, maximum, minLength, maxLength, pattern, format, enum, const, and many more for comprehensive validation.
Is my data secure when using this tool?
Yes, all validation is performed locally in your browser. Your JSON data and schemas are never sent to our servers, ensuring complete privacy and security of your sensitive information.