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Paste JSON and generate TypeScript interfaces or type aliases with nested models and array inference.
JSON Input
TypeScript Output
Parser: JSON
Generated from local input only. No data is uploaded.
Every tool runs entirely in your browser. Nothing you type is uploaded, stored, or logged on our servers.
The TypeScript Type Generator converts JSON into ready-to-use TypeScript definitions. It handles nested objects, arrays, nullable values, and mixed array content while generating named interfaces for complex structures.
Choose parser mode (JSON, JSON5, JSONC), pick interface or type alias output, and optionally mark all fields as readonly. Use the generated output directly in frontend APIs, SDK clients, and test fixtures.
This JSON to TypeScript generator is useful when you need to quickly convert API responses into TypeScript interfacesor type aliases without manual typing. It works as a free, browser-based JSON to TypeScript tool for fast schema-to-type workflows.
It converts JSON data into TypeScript interfaces or types, inferring field names and value types so you get typed models without writing them by hand.
No. The types are generated entirely client-side in your browser, so your data never leaves your machine.
Yes. Nested objects become nested interfaces and arrays are typed by their element shape, so complex payloads are represented accurately.
Fields are typed from the sample you provide, so include representative data to capture optional or union types correctly.
Yes. The generated interfaces are ready to paste into a .ts or .d.ts file and refine as needed.