Paste sample JSON data to automatically infer a draft-07 JSON Schema. It detects each value's type, marks object keys as required, and merges array item schemas.
JSON Schema is a standard for describing the structure, types and constraints of JSON data. It is widely used to validate API requests/responses, check config files, and automate documentation. This tool generates a draft-07 schema draft from a single example JSON, saving you from writing one by hand from scratch.
Strings, integers, floats, booleans and null are mapped to the string, integer, number, boolean and null types. Objects get properties and mark every present key as required; arrays merge the schemas of all elements into items. When array elements have different keys, only keys present in every element stay required.
Auto-inference is only a starting point. Real schemas usually add format (email, date-time), min/max length, enum, regex pattern, and adjustments for optional fields. Large input is capped by a node limit for performance, so build a draft from a representative sample and then fine-tune the constraints.