JSON Schema Validator
Validate JSON data against a JSON Schema in real time. Supports Draft 7 and Draft 2020-12, example schemas, format validation, and copyable error paths.
- Private & secure
- Fast in-browser
- No signup
How to use JSON Schema Validator
- Open the tool. Go to JSON Schema Validator on Utilvia. It runs instantly in your browser.
- Enter your values. Fill in the fields. Results update as you type — no signup required.
- Review the output. Check totals, breakdowns, or formatted text before you copy or save.
- Copy or export. Copy the result or download a file. Your inputs stay on this device.
Key features & privacy
JSON Schema Validator is built for in-browser use on Utilvia. Work stays on this device whenever the tool runs locally — there is no account wall and no file inbox on our servers.
- Runs in modern browsers with JavaScript and HTML5.
- No signup required to get a result.
- Zero-upload policy on local-first tools — close the tab and the working copy is gone.
- Shareable, indexable URL so you can return to the same utility later.
Frequently asked questions
What is JSON Schema used for?
JSON Schema describes and validates the structure of JSON data — used in REST APIs, configuration files, and OpenAPI documentation.
What is the difference between Draft 7 and Draft 2020-12?
Draft 7 is most widely used and compatible with OpenAPI 3.0. Draft 2020-12 adds $dynamicRef for complex recursive schemas.
Why does valid JSON fail schema validation?
Syntax-valid JSON can fail if types don't match, required fields are missing, or values are outside allowed ranges.
How do I mark a field as required?
Use the required array at the same level as properties: { "properties": {...}, "required": ["name"] }.
Is this validator free?
Yes. It runs in your browser with no signup. Your JSON stays on your device.