Convert raw JSON payloads into fully recursive TypeScript Interfaces, Zod Schemas, PHP 8 DTOs, Pydantic Models, and JSON Schema Draft 7 — including nested objects, mixed-type arrays, and unsafe/reserved field names. All operations are processed 100% locally in your browser.
Paste a JSON array where each element is a full sample of the same object — e.g. several real user records. The output schema describes that one object (not an array); more samples give format/optional/enum inference more evidence to work with.
Why each optional field, union, format, and enum came out the way it did — JSON itself carries none of this reasoning, so it's shown explicitly instead of silently baked into the output.
The generated JSON Schema, checked against every sample it was built from — a structural proof the schema actually fits the data, not just a trust exercise in the inference logic above.
✓ All {{ schemaValidationResults.length }} sample{{ schemaValidationResults.length===1?'':'s' }} validate against the generated schemaNaming convention only renames PHP/Pydantic attribute names — TypeScript, Zod and JSON Schema always mirror the real JSON keys exactly (quoted when needed), since those targets validate the actual data and a renamed key would silently break runtime checks against real payloads. Renamed PHP/Pydantic fields keep a mapping back to the original JSON key (doc comment / Field(alias=...)).
Schema Studio derives strict, fully recursive data contracts and type definitions from JSON structures — nested objects become real nested interfaces/classes/models (not flattened placeholders), mixed-type arrays become unions, and unsafe or reserved field names are sanitized consistently across every target language.
Format & enum inference: a string field is flagged with a JSON Schema format (email, date, date-time, UUID, URI, IPv4) only when every sample seen for that field matches — one coincidentally email-shaped value among several plain strings does not get flagged, since that would be a false signal, not a real pattern. A small set of repeated values (2+ samples, ≤5 distinct, with at least one repeat) becomes a string-literal enum in TypeScript/Zod and a JSON Schema enum instead. Multiple samples mode accepts a JSON array of several examples of the same object — more samples give both of these more evidence, and every optional/union/format/enum decision is logged with its reasoning in Inference Notes, since none of that reasoning survives in the JSON itself. The generated JSON Schema is then validated against every sample it was built from, so a bug in the inference logic surfaces as a failed validation rather than silently shipping a schema that doesn't actually fit its own source data.
YAML/CSV input is deliberately out of scope here — this tool infers a schema FROM data, and JSON is the one format where "a sample of the data" and "the schema's own literal syntax" are the same representation; adding a second input parser was a larger, separate decision than this pass.
Privacy: 100% Client-side. JSON inputs are parsed locally in memory and never transmitted to external servers.
