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JSON to TypeScript Interfaces

Generate TypeScript interfaces from JSON examples, including nested values and array unions.

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JSON to TS Interfaces online

Draft TypeScript interfaces for a sample API response. Types reflect the example rather than a complete API contract; review optionality and unexpected values.

How to use it

Enter the source input or select Try example. Review Root interface name. Select Run tool and inspect the result before copying or downloading.

Options and example settings

Option	Choices / value	Example default
Root interface name	Enter a value	User

Worked examples

Draft TypeScript interfaces for a sample API response.

Worked example — JSON to TypeScript Interfaces

Settings: Root interface name: User

Input:

{"name":"Anna","age":25,"tags":["user"],"address":{"city":"Tirana"}}

Output:

export interface Address {
  "city": string;
}

export interface User {
  "name": string;
  "age": number;
  "tags": Array<string>;
  "address": Address;
}

The example output has 10 lines. Compare its order, separators and whitespace with the input before copying the result.

Limitations and common mistakes

Types reflect the example rather than a complete API contract; review optionality and unexpected values.

Frequently asked questions

How can I create TypeScript interfaces from JSON examples, including nested values and array unions online?

Enter the source input or select Try example. Review Root interface name. Select Run tool and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.