INFER · NAME · EXPORT

Generate clean TypeScript from JSON.

Paste a real JSON payload and turn it into readable TypeScript interfaces or type aliases, including nested objects, arrays, optional properties and nullable values — all locally in your browser.

Local processing only

JSON Input

Source payload for TypeScript inference

JSON

TypeScript Output

Generated declarations ready to copy or save

.ts

0Declarations

0Properties

0Structure depth

0Union types

Optional propertiesWhen objects inside an array do not share every property, Type Studio marks the missing fields with ?.

Mixed arraysDifferent observed value types are represented as unions instead of being silently widened to any.

Safe fallbackEmpty arrays and unsupported values use unknown, keeping generated TypeScript explicit and safe.