JSON Tool
JSON to JSON Schema Generator
Generate JSON Schema from JSON examples.
JSON to JSON Schema
Generate a simple JSON Schema from sample JSON in one click.
Overview
Turn sample payloads into a schema draft to speed up request validation and API documentation workflows.
Examples
Object schema generation
Input
{"id":1,"name":"John","active":true}Output
{"type":"object","required":["id","name","active"]}Array item schema generation
Input
{"tags":["api","json"]}Output
{"type":"object","properties":{"tags":{"type":"array"}}}Use cases
- Draft payload validation schemas quickly.
- Speed up OpenAPI schema authoring.
- Document expected object structures.
FAQ
Is the generated schema complete?
It is a practical starting point that usually needs manual refinement.
Which JSON Schema draft is used?
The output uses draft 2020-12.
How are empty arrays handled?
Empty arrays default to a generic placeholder item type.
Can it infer optional fields?
No. It marks fields present in the sample as required.