About generationInfers a schema from sample JSON as a contract starting point; required inference can be turned off (all-required is a placeholder default), and format detection is conservative to avoid false positives.Target draft: Draft 2020-12 · Max input size: TBD (placeholder)

Sample JSONJSON

Generated SchemaSchema

Paste or type sample JSON

Sample JSON → Schema · Local · No upload

JSON Schema Generator

Infer a schema from a sample · Conservative format detection · Required toggle · Choose draft

🔒Processed locally in your browser — never uploaded or stored

No upload, no storage

JSON is processed in memory and never sent to a server.

Share via URL fragment

Share links encode data in the # anchor — never sent to a server.

Remember last edit

Optionally keep your last input locally; clear it with one click.

Generate Schema from Sample JSON｜Auto-Detect Formats (email/date/uri)｜Required Fields & Examples｜Choose Draft Version｜Runs Locally — No Upload

Infer Schema from Sample

Paste sample JSON to generate a schema as a contract starting point.

Conservative Formats

Detects email/date/uri etc. conservatively; toggle off to avoid false positives.

Required Toggle

Required inference can be turned off (all-required is a placeholder default).

Examples / Draft

Optionally include examples; target draft version selectable (TBD).

Runs Locally — No Upload

Generation runs in your browser; data is never uploaded.