- Paste your JSON: Copy your JSON object or API response and paste it into the input editor.
- Set Root Name: Provide a name for your top-level interface (e.g., 'User' or 'ApiResponse').
- Generate: Click the 'Generate Interfaces' button to instantly transform the structure into TypeScript types.
- Copy or Download: Use the action buttons to copy the code to your clipboard or download it as a definition file.
JSON to TypeScript
Generate clean, accurate TypeScript interfaces and types from JSON data instantly.
Input JSON
1
TypeScript Interfaces
1
How to Generate TypeScript Interfaces from JSON
Why use a JSON to TypeScript Converter?
Manually writing TypeScript interfaces for large API responses is time-consuming and error-prone. Our tool automates this process, ensuring type safety in your application. It prevents 'any' types and helps catch bugs early by defining exact structures for your data models.
Key Features of JSONGood TS Generator
Supports nested objects, complex arrays, PascalCase interface naming, and inferred types. It is designed for modern frontend developers working with TypeScript in React, Vue, or Angular.
Frequently Asked Questions
How does JSON to TypeScript generation work?
The tool analyzes your JSON structure and infers TypeScript types for each value — strings become `string`, numbers become `number`, nested objects become separate interfaces, and arrays are typed based on their contents. It uses a recursive algorithm to handle any level of nesting.
Does it handle optional properties?
By default, the tool assumes properties are required. However, if multiple objects are detected in an array with differing properties, it will intelligently mark inconsistent fields as optional (`?`).
Can I download the generated interfaces?
Yes, you can click the 'Download' button to save the generated code as a `.d.ts` file for immediate use in your React, Next.js, or Node.js projects.
Is my JSON data kept private?
Absolutely. All processing is done 100% client-side in your browser. No JSON data is ever sent to our servers, making it safe for processing sensitive or proprietary API responses.