JSON Schema Studio

Generate and validate JSON Schema locally with readable path-specific feedback.

Require observed propertiesDisallow extra properties

Generation options apply the next time you generate. Validation uses JSON Schema 2020-12, including formats and local references. Remote references are not fetched.

JSON document

JSON · 1 line

JSON Schema

JSON · 23 lines

Edit generated rules before validating.

Schema status

Schema generated from this sample. Review the rules before relying on them.

How this tool works

How it works

Generate a JSON Schema 2020-12 document from sample JSON, including mixed-type arrays. Choose whether observed properties are required and whether extra properties are allowed. Inference describes the sample; review the rules for your actual data.

Edit the schema, then validate using Ajv with format checks and local references. Errors include JSON Pointer paths. Remote references are not fetched. Each input is limited to 1 MB; validation runs in a background worker and stops after four seconds. Copy or download the schema.

Privacy

All parsing and validation runs in this browser.