JSON to TypeScript Interfaces

Stop manually typing TypeScript interfaces from API responses. Paste any JSON — no matter how deeply nested — and instantly get production-ready TypeScript interfaces. Handles arrays, nested objects, null values, and special key names. Runs entirely in your browser, zero upload.

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Cara menggunakan JSON to TypeScript Interfaces

Selesaikan tugasmu dengan sempurna dalam tiga langkah mudah.

Paste Your JSON

Paste a raw API response, config file, or any JSON object into the left panel.

Configure Options

Set your root interface name, choose export/optional preferences, and switch between interface and type alias styles.

Copy or Download

Instantly copy the generated TypeScript to your clipboard or download as a .ts file.

Pertanyaan yang sering ditanyakan

Semua yang perlu kamu ketahui tentang JSON to TypeScript Interfaces.

Does it handle deeply nested objects?

Yes. The generator recursively traverses all nested objects and arrays, creating a separate named interface for each one — so you get clean, reusable types rather than deeply nested inline types.

What happens with null values?

When 'Make nullable fields optional' is on, null fields are typed as 'string | null' with a '?' modifier. When off, null fields are typed as 'null' — useful when you want to be strict about what's truly unknown.

What's the difference between interface and type alias?

In TypeScript, interfaces are open (can be extended/merged) while type aliases are closed. For most API response shapes, both are equivalent. Use interface for domain models you might extend; use type for strict data shapes.

Does it handle arrays at the root?

Yes. If you paste an array like [{...}, {...}], the generator creates interfaces for the item type and exports a root type alias like 'type Users = User[]'.