JSON to TypeScript Interface Generator

The sample is parsed, and each value is mapped to a TypeScript type: strings become string, numbers become number, booleans become boolean, and objects become named interfaces. Arrays are typed from their elements, and the whole result is printed as ready-to-use code.

Nested objects are emitted as their own interfaces named after their key, so a deeply nested response stays readable rather than turning into an unreadable inline type. Arrays of objects produce an interface plus an array type. Duplicate shapes are reused where possible.

A JSON sample is only one example of the data. A field that is null here may be a string in the next response, so check the generated types against the API documentation. Arrays that mix types are widened, and fields missing from an object are not automatically made optional.

The root name becomes the main interface name. Use the domain concept rather than a generic name such as Data, so the code reads well at the call site. Nested interface names follow their keys, which is why consistent naming in the API response matters.

The JSON is processed only to generate the types and is not stored. The result is a starting point, not a replacement for a schema: the generator cannot know which fields are optional or which unions the API allows beyond the sample you provide.