JSON Schema Generator

Get a reliable result in three steps

1. 1

   Choose the generation settings that match your intended use.

2. 2

   Review the limits and guidance beside each field.

3. 3

   Generate the result, then copy or download it where appropriate.

What this tool does

JSON Schema Generator gives you a fast, focused way to infer a draft 2020-12 JSON Schema from the structure and primitive types in sample JSON. Everything runs locally in this tab.

The result is produced only after the input is checked. If the value cannot be processed, the workspace reports a specific error instead of guessing.

Example

{"id":1,"name":"Ada","active":true,"roles":["admin"]}

Limitations

• Review important output before using it in production.
• Very large inputs remain subject to browser memory limits.
• Inference describes the supplied sample and cannot discover business rules such as ranges, patterns, or optional fields.
• Mixed array values are represented with anyOf.