How do I use the JSON → TypeScript Types?

The output is a single root interface; nested objects become inline types Union types are inferred from arrays of mixed elements null fields are marked optional with the ? modifier

Is the JSON → TypeScript Types free and private?

Yes — it runs in your browser, requires no signup for basic use, and your data never leaves your device. TypeScript 4.1 added template-literal types, which let you derive string types from other string types at compile time.

DevTools Surf

JSON → TypeScript Types

Infer TypeScript interfaces from JSON with deep nesting + optionals

1 credit

JSON Sample

TypeScript Interface

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