JSON Schema Validator
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About JSON Schema Validator
Validate JSON Against Schema Online – Free & Instant
The JSON Schema Validator is a free online tool that checks if your JSON data conforms to a given JSON Schema. It instantly highlights errors and inconsistencies in structure, types, and required fields — helping developers ensure data accuracy and API compliance.
What Is JSON Schema Validation?
JSON Schema is a standardized way to describe the structure and types within a JSON document. This tool allows you to paste your schema and your data, and verify whether the JSON matches the schema rules — including required fields, data types, and nesting.
Top Features
- Dual Input: Paste both your JSON data and its schema side-by-side for instant comparison.
- Error Highlighting: Get detailed feedback if any field, type, or structure does not match.
- Draft-07 Support: Validates according to JSON Schema Draft-07 — widely supported in modern apps.
- 100% Offline: Runs in your browser only. No server interaction means secure validation.
- Copy or Export Results: Quickly share, fix, or document your validation outputs.
How to Use the JSON Schema Validator
Step 1: Paste JSON Schema
Insert your JSON Schema in the left box.
Step 2: Paste Your JSON Data
Insert the JSON you want to validate in the right box.
Step 3: Click “Validate”
The tool shows whether your JSON is valid. If not, it provides specific error messages for quick fixing.
Common Use Cases
- Frontend-backend data contract verification
- API response validation and testing
- Form input structure validation
- Database migration checks
Frequently Asked Questions
1. What does this tool validate?
It checks if the provided JSON matches the structure and types defined in the schema.
2. Which schema draft is supported?
This tool supports JSON Schema Draft-07, which is widely adopted.
3. Can I see what failed in validation?
Yes, you’ll see specific error messages indicating the exact mismatch or issue.
4. Is my data safe?
Completely. Everything runs client-side in your browser. No data is sent to any server.
5. Does it support nested JSON and arrays?
Yes. It validates full structures including deeply nested arrays and objects.
6. Can I copy or export the results?
Yes. You can copy the validation output or download your fixed JSON instantly.
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