How are TypeScript interfaces named?

The root uses the name you enter. Nested objects combine the parent name with the property name, and arrays use a singular form, so "orders" becomes something like RootOrder.

What happens with optional properties in arrays?

Object arrays are merged. Keys present in every item are required; keys missing from at least one item are marked with a question mark.

Which JSON Schema version is generated?

Draft-07 with a $schema field, title, properties, required keys, array items and null types.

No. Parsing and generation happen entirely in your browser. Nothing is stored or sent to a server.

JSON to TypeScript & JSON Schema

Paste a JSON sample and get TypeScript interfaces or a draft-07 JSON Schema. Nested objects and arrays are inferred automatically. Everything runs in your browser.

Root name

JSON input

Generated types appear here…

What gets inferred

Strings, numbers, booleans and null map to their TypeScript counterparts.
Nested objects become named interfaces; arrays of objects produce one merged interface.
Keys missing from some array items become optional properties.
JSON Schema output includes draft-07 metadata, properties, required keys and array items.

Validate JSON first with the JSON Formatter, or convert formats with the JSON ↔ YAML / CSV Converter.

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JSON to TypeScript & JSON Schema

What gets inferred

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