Private, browser-local utility
JSON Schema Generator
Infer a bounded JSON Schema Draft 2020-12 structure from sample JSON locally.
Inputs, files, and results stay in this browser tab. Nothing is uploaded, fetched, executed, or stored.
Loading local tool…
Generated schema
Inference scope
This tool infers structural types for objects, arrays, strings, numbers, integers, booleans, and null using JSON Schema Draft 2020-12. Mixed arrays use compatible merged schemas or anyOf. It does not guess semantic formats, business validation, descriptions, enums, minimums, or domain rules.
Input is limited to 200,000 characters, 100,000 nodes, and 50 nesting levels. Generated output is capped at 500,000 characters.