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JSON to TypeScript Types
Convert JSON samples into clean TypeScript interfaces and union types with nested inference, optional-field detection, and null-safe typing. Fast, private, and browser-based.
JSON to TypeScript Types Use Cases
- Bootstrap frontend and backend models from real API payloads
- Generate typed contracts for SDKs and webhook integrations
- Replace manual interface drafting for deeply nested JSON data
- Accelerate refactors by deriving strict types from existing sample data
JSON to TypeScript Types FAQ
How does the tool map JSON values to TypeScript types?
Strings become string, numbers become number, booleans become boolean, arrays become typed arrays, and nested objects become generated interfaces. Mixed values are represented as union types.
How are optional and nullable fields handled?
If a key is missing in part of the sample set, it is marked optional with ?. If a value can be null, the generated type includes a null union.
Can I use the generated output directly in production code?
Yes. The output is designed as a practical starting point for app and API models. You can paste it directly into your codebase and refine naming conventions if needed.