How to use JSON Schema Validator
1
Prepare JSON Data
Enter or drag your JSON data into the left pane. Use the "Format" button to clean up the structure instantly.
2
Load Validation Schema
Provide your validation rules in the middle pane. Supports Draft 7+ specs and various custom constraints.
3
Instant Validation
Click the Validate button. The right pane will display the result or a detailed list of errors with instance paths.
Key Features
Ajv High-Performance Engine
Powered by the fastest and most standard-compliant JSON Schema validation library available for web apps.
Privacy-First Design
All validation happens locally in your browser. Your JSON data is never uploaded to any server.
Drag & Drop Support
Easily import files by dragging them into the text areas or using the dedicated file upload buttons.
Instance Path Debugging
Error reports pinpoint exact locations in your JSON structure using standard Instance Paths for faster debugging.
Frequently Asked Questions
Is it free to use?
Yes, all tools on WebUtilityKit are completely free to use with no hidden costs or registration required.
Which JSON Schema versions are supported?
We use the industrial-grade Ajv library, which supports Draft 7, Draft 2019-09, and Draft 2020-12 by default. This covers the vast majority of modern API and data specification needs.
Why do I see Strict Mode warnings?
Ajv enforces strict mode to prevent ambiguous schema definitions. While we've enabled a relaxed configuration for broader compatibility, we recommend following standard schema practices for the best results.