JSON Copilot JSON Schema Validation
November 2025
Validate your JSON data against JSON Schema (Draft 2020-12) with detailed error reporting and instant feedback. Ensure your JSON meets specific structure and type requirements.
What is JSON Schema?
JSON Schema is a powerful vocabulary that allows you to validate, annotate, and document JSON data. It defines the structure, data types, required fields, and constraints that your JSON must follow.
Common use cases include API request/response validation, configuration file verification, data quality assurance, form data validation, and database schema enforcement. By validating against a schema, you can catch data errors early, ensure data consistency, and reduce debugging time.
What You Can Validate
JSON Schema supports comprehensive validation rules:
- Data Types: Ensure fields are strings, numbers, booleans, arrays, or objects
- Required Fields: Verify all mandatory properties are present
- String Patterns: Validate emails, URLs, dates with regex patterns
- Number Ranges: Set minimum, maximum, and exclusive bounds
- Array Constraints: Control array length, item types, and uniqueness
- Enum Values: Restrict values to specific options
How to Use Schema Validation
- 1Paste your JSON data into the main editor
- 2Click the Schema button in the toolbar to open the schema panel
- 3Enter your JSON Schema or choose from example schemas
- 4Click Validate Schema to check your JSON against the schema
- 5Review detailed error messages showing exactly what failed validation
Example Schemas Included
JSON Copilot includes ready-to-use example schemas to help you get started:
- • User Profile: Validate user data with name, email, age
- • Product Catalog: Ensure products have required pricing and details
- • API Response: Validate standard REST API response structures
- • Configuration File: Check app config format and required settings
Privacy & Technical Details
Schema validation happens entirely in your browser using the industry-standard Ajv (Another JSON Schema Validator) library. Your JSON data and schemas never leave your device.
We support JSON Schema Draft 2020-12 specification with fast validation that handles large schemas efficiently. Error reporting provides detailed messages with JSON paths pointing directly to validation failures.