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JSON to TypeScript Interface is a free online tool that converts a JSON object into a TypeScript interface definition. It infers types for strings, numbers, booleans, arrays, nested objects, and null values automatically.

A TypeScript interface defines the shape of an object, specifying property names and their types. When working with API responses or JSON data, generating interfaces manually is tedious. This tool automates the conversion, saving time and reducing errors in TypeScript projects.

JSON to TypeScript Interface

Convert a JSON object into a TypeScript interface definition instantly.

How to Use

  1. Paste a JSON object into the input field
  2. Click Convert to TypeScript
  3. The tool generates a TypeScript interface with inferred types
  4. Copy the interface and paste it into your TypeScript project

Example

Input

{"name":"Alice","age":30,"active":true}

Output

export interface Root {
  name: string;
  age: number;
  active: boolean;
}

FAQ

Does this tool support nested objects?
Yes, nested objects and arrays are recursively converted into inline TypeScript types.
Is this tool free?
Yes, it is completely free with no registration required.
Does this tool run in the browser?
Yes, all conversion happens locally in your browser with no data sent to a server.

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