JSON to TypeScript
Paste JSON, get TypeScript interfaces, types, or Zod/Yup schemas instantly. Everything runs securely in your browser.
JSON to TypeScript - How It Works
JSON to TypeScript conversion generates typed interface definitions from your JSON data. Instead of manually writing interfaces that mirror your API responses or config files, our converter analyzes your JSON structure and automatically infers the correct TypeScript types for every field.
The converter reads your JSON input, identifies each data type — strings, numbers, booleans, arrays, nested objects, and null values — and generates clean, properly formatted TypeScript code. Nested objects become their own interfaces, arrays become typed arrays, and null values become optional properties.
Features and Options
The converter offers several output styles to match your project's conventions:
- Interface — Generates TypeScript interfaces with proper inheritance. Best for object shapes that may be extended later.
- Type Alias — Generates type aliases using the
typekeyword. More flexible for complex union and intersection types. - Zod Schema — Generates Zod validation schemas with runtime type inference. Perfect for API request/response validation.
- Yup Schema — Generates Yup validation schemas with inferred types. Great for form validation in React projects.
Frequently Asked Questions
How do I convert JSON to TypeScript online?
Paste your JSON payload into the input editor on the left. The tool instantly infers strings, numbers, arrays, and objects, automatically generating ready-to-use TypeScript interfaces, type aliases, or Zod schemas on the right. No login required.
How to generate TypeScript types from a REST API response?
Copy the raw JSON payload from your browser's network tab, Postman, or cURL request. Paste it into the converter, and it will recursively map every nested field into clean TypeScript interfaces, giving you perfect type safety for your fetch or axios requests.
Can I create Zod schemas automatically from JSON?
Yes. Select "Zod Schema" from the Output dropdown. The converter maps JSON primitives to z.string(), z.number(), and z.object(), saving you hours of writing manual runtime validation logic. It also automatically includes z.infer<typeof Schema> typings.
How does the tool handle nested JSON objects and arrays?
Deeply nested JSON trees are automatically flattened into linked TypeScript interfaces. A JSON array containing objects will generate a distinct interface for the object shape and output an array type signature like MyNestedItem[].
JSON to TypeScript type alias vs interface?
Interfaces are ideal for defining object shapes and support declaration merging, making them great for API responses. Type aliases are more flexible and support unions or mapped types. Our tool supports both—simply toggle the output setting to match your codebase preferences.
How do you convert JSON to TypeScript in VS Code?
While there are VS Code extensions available, using our online converter requires zero installation, doesn't slow down your IDE, and provides advanced features like instant Yup/Zod schema generation alongside standard TypeScript interfaces.