JSON Schema Validator
Validate JSON data against a JSON Schema
JSON Schema Validator is a free online tool from BrowserUtils that validate json data against a json schema. It runs entirely in your browser — your data never leaves your device. No account required.
How to use JSON Schema Validator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About JSON Schema Validator
Free online JSON Schema validator. Check if your JSON data conforms to a JSON Schema definition with detailed error reporting. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
JSON Schema Validator specs
- Runtime
- 100% client-side (browser)
- Built on
- Native JavaScript JSON.parse / JSON.stringify (RFC 8259 compliant)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What is JSON Schema?
JSON Schema is a vocabulary that lets you annotate and validate JSON documents. It defines the structure, required fields, data types, and constraints that valid JSON data must follow.
Which JSON Schema draft versions are supported?
This tool supports JSON Schema Draft 4, 6, 7, and 2019-09, covering the most commonly used versions in APIs and configuration validation.
How do I validate an API response against a schema?
Paste your JSON Schema in one field and your API response JSON in the other. The tool will report which fields are missing, have wrong types, or violate constraints defined in the schema.
Can I use JSON Schema to validate form data?
Yes, JSON Schema is commonly used for both server-side and client-side form validation. Libraries like Ajv (JavaScript) and jsonschema (Python) can validate data against a schema at runtime.
What is the difference between JSON Schema and JSON validation?
JSON validation checks if a string is valid JSON syntax. JSON Schema validation checks if valid JSON conforms to a specific structure, including required fields, data types, and value constraints.
Does JSON Schema validation run offline?
Yes, the schema validation runs entirely in your browser. Both your schema and data stay on your device and are never transmitted to a server.
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