JSON to TypeScript — Generate Interfaces & Union Types
Paste JSON and get TypeScript interfaces with nested types, optional properties, and union types. Saves hours of boilerplate. Runs in your browser — nothing uploaded.
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Frequently Asked Questions
How are optional properties detected?
Properties that appear in some objects but not others are marked as optional with the ? operator.
What about nested objects?
Nested objects generate separate interfaces with proper references, creating a complete type hierarchy.
How are arrays handled?
Arrays generate Array<Type> syntax. If array items vary, union types are created automatically.
Can it detect union types?
Yes! When a property has multiple types across samples (e.g., string or number), it generates union types.
What about null vs undefined?
The tool distinguishes between null and undefined, generating appropriate TypeScript types for each.