JSON Schema Generator

When to use?

Use it to quickly draft a validation JSON Schema from an API response sample.

How to use

• Paste a JSON sample.
• Check the auto-inferred schema.
• Adjust fields and use it.

Input Explanation

Enter a JSON sample as an object or array.

Calculation Basis

It recursively infers types from the sample values to generate a JSON Schema draft 2020-12 draft.

Usage Examples

• API validation draft - Make a schema draft from sample JSON.
• Document data structure - Organize the JSON structure as a schema for documentation.
• Prepare input validation - Make a starting point for a schema to validate form or API input.

Examples

• {"id":1,"name":"A"} → schema with id integer, name string
• A user-list JSON sample → a schema draft with each field type inferred

Cautions

• It is sample-based inference and may not represent every case of the real API.
• A mismatched encoding standard or complex nested data may break or drop the structure.

FAQ

Is it a finished schema?

It is a draft. Refine nullable, enum, format, etc. yourself.

Which JSON Schema version does it follow?

It drafts based on the widely used JSON Schema structure.

Can I merge several samples?

It builds from one sample at a time. Merge differences across samples into the result yourself.

Are required properties shown?

It builds from the sample's properties; adjust required status to fit your data.

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