JSON to TypeScript

This tool infers types from one example document, not a schema. If a field is null in your sample, there is no other value in that document to widen it against, so it comes out as the literal type null - widen it by hand to `string | null` (or whatever the real type is) if you know the field can hold other values.

There are no elements to infer a type from, so it becomes `unknown[]`. This is a documented limitation, not a bug - supply an example with at least one element in the array if you want a real element type.

Each nested object is named from its field name using a light PascalCase-and-singularize heuristic (e.g. "orders" -> Order), not a grammar engine, so unusual plurals may not singularize perfectly. If two different fields would produce the same name for genuinely different shapes, the tool appends a number (Order, Order2, ...) rather than overwriting one; identical shapes at different field names are left as separate interfaces without deduplication, by design.

They are merged into one interface: the field list is the union of every key seen, and any key that is not present in every element is marked optional (regardless of the general "make everything optional" toggle, which is a separate, blanket setting).