JSON to TypeScript

Turn a JSON sample into TypeScript interfaces or type aliases, with nested types, unions and optional fields.

JSON file (optional - or paste below)

JSON sample

Root type name

Output style

Fields

Options

Add the export keyword

End each member with a semicolon

TypeScript output

How it works

Nested objects become their own named interfaces; arrays of objects become typed arrays (Tag[]).
Mixed values in an array produce a union type, and null is always added as an option.
Field names that are not valid identifiers are quoted automatically, and numbers become number.