JSON Schema Generator — Free Online Tool
Paste any JSON value and instantly get a draft-07 JSON Schema with inferred types for every field. Options to add required[], additionalProperties: false, and title fields. Useful for bootstrapping API validation schemas, form config generators, and API documentation.
100% client-side. No uploads. Your data never leaves your browser.
How to use JSON Schema Generator
- Paste a sample JSON value into the input.
- Toggle options: Add required[], additionalProperties: false, Add title.
- Click 'Generate Schema' to produce the JSON Schema.
- Copy or download the schema.json for use in your validator.
Frequently Asked Questions
What is JSON Schema?
JSON Schema is a vocabulary for describing and validating JSON data. A schema defines the expected structure, types, and constraints for a JSON document.
Why does this only look at the first array element?
The tool infers array item schema from the first element. In practice, all items should match the same schema — review and refine the output for heterogeneous arrays.
Can I use this output directly in production?
It's a starting point. Review and add constraints (minLength, minimum, pattern, enum) appropriate for your data after generating the base schema.
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