JSON Playground
JSON Schema Generator & Validator Online
Generate JSON Schema from sample JSON and validate JSON online. Draft 2020-12 support, precise errors, format detection, and private browser processing.
What you can do on this page
- JSON schema generator
- JSON schema validator
- generate JSON schema from JSON
- JSON validator with schema
- JSON schema online
- Draft 2020-12
Fast, private, browser-based developer tools
JSON Playground provides free utilities for developers, testers, students, and data professionals. Supported operations run in your browser whenever possible, which keeps the experience responsive and helps sensitive input stay on your device. No account is required to start using the tools.
Frequently asked questions
- How do I generate a JSON Schema from JSON?
- Paste a valid JSON sample and select Generate Schema. The tool infers properties, arrays, primitive types, required fields, nested structures, and common string formats.
- Which JSON Schema version does this tool use?
- Generated schemas target JSON Schema Draft 2020-12 and validation uses Ajv with standard formats including email, URI, UUID, date, and date-time.
- Is my JSON uploaded to a server?
- No. JSON Schema generation and validation run locally in your browser, so your JSON documents and schemas are not uploaded to JSON Playground.