JSON to Java
Generate Java DTOs and review validation-oriented API models.
JSON Schema
Generate a Draft-07 JSON Schema draft from sample payloads
Paste one or more JSON samples to produce a JSON Schema skeleton with inferred types and required fields. Use it as the starting point for contract docs or validator setup.
Why generate rather than hand-write
Writing JSON Schema from scratch is error prone — missed fields, mis-typed properties, wrong `required` lists. Generating a draft from real samples removes the boilerplate, and the team can layer on domain rules afterwards.
The generator walks every sample to infer types, nested objects, and array item shapes. The resulting schema is directly usable with validators like Ajv.
FAQ
Q. Can I mark every field required? Fields that appear in every sample land in `required`. To relax a field, include samples where it is missing.
Q. Does it also produce numeric bounds or string patterns? Not yet — the draft stays at the type level. Add domain-specific constraints manually.
Pairs well with
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Turn API payloads into TypeScript interfaces for frontend work.
JSON Formatter
Format sample payloads before sending them back into the converter.