JSON Copilot What is JSON Schema validation?
Features & Capabilities
JSON Schema validation ensures your JSON data conforms to a predefined structure and set of rules. It's like a blueprint that defines what fields should exist, their data types, required values, and validation constraints. JSON Copilot uses the industry-standard Ajv (Another JSON Schema Validator) library for fast, reliable validation.
Why Use Schema Validation?
Catch errors early, enforce data contracts, ensure API compatibility, and maintain data quality across your applications.
How Schema Validation Works
Define Your Schema
Create a JSON Schema that describes the expected structure, data types, and constraints.
Load Your Schema
Click "Validate Schema" in the toolbar and paste your JSON Schema definition.
Validate Instantly
JSON Copilot validates your data and highlights any violations with detailed error messages.
Example Schema & Data
JSON Schema
{
"type": "object",
"required": ["name", "email"],
"properties": {
"name": {
"type": "string",
"minLength": 1
},
"email": {
"type": "string",
"format": "email"
},
"age": {
"type": "number",
"minimum": 0,
"maximum": 120
}
}
}Valid JSON Data
{
"name": "Alice Johnson",
"email": "alice@example.com",
"age": 28
}Invalid JSON Data
{
"name": "",
"email": "not-an-email",
"age": 150
}Common Validation Features
Type Checking
Ensure fields are strings, numbers, booleans, arrays, or objects.
Required Fields
Specify which properties must be present in the JSON.
String Formats
Validate emails, URLs, dates, UUIDs, and custom patterns.
Numeric Ranges
Set minimum, maximum, and multipleOf constraints for numbers.
Array Validation
Define min/max items, unique items, and item schemas.
Nested Objects
Validate complex nested structures with recursive schemas.
Powered by Ajv
JSON Copilot uses Ajv, the fastest JSON Schema validator for JavaScript. It supports JSON Schema draft-07, draft-2019-09, and draft-2020-12, ensuring compatibility with the latest standards.
Pro Tip
Use schema validation during development to catch data structure issues early. Save your schemas for repeated validation of API responses and configuration files.
Still Have Questions?
Check out our other FAQ topics or return to the JSON Copilot app