Tools/JSON to TypeScript

JSON to TypeScript Interface Generator

Automatically generate TypeScript interfaces from JSON data. Supports nested objects, arrays, and complex types.

Interface Name

Input JSON

Generated TypeScript

What is JSON to TypeScript?

JSON to TypeScript is a tool that automatically generates TypeScript interface definitions from JSON data. Instead of manually typing out interfaces for complex JSON structures, this tool analyzes your JSON and creates corresponding TypeScript types.

This is especially useful when:

Working with API responses that return complex JSON structures
Setting up TypeScript projects with existing JSON data
Ensuring type safety in your application
Reducing manual type definition work

How to Generate TypeScript Interfaces

Paste your JSON: Copy and paste your JSON data into the input field
Set interface name: Enter the desired name for your root interface
Click Generate: Click the "Generate" button to create TypeScript interfaces
Copy the output: Use the "Copy" button to copy the generated interfaces
Use in your project: Paste the generated interfaces into your TypeScript files

Type Inference

The tool intelligently infers TypeScript types from your JSON data:

Primitives

string, number, boolean are automatically detected

Objects

Nested objects create nested interfaces

Arrays

Array types are inferred from the first element

Null Values

Null values are marked as optional properties

Best Practices

✅
Use clean JSON: Ensure your JSON is valid before converting
✅
Review generated interfaces: The tool does its best, but you may need to adjust types manually
✅
Use descriptive names: Choose clear, meaningful interface names
✅
Update as needed: Refine strict types and add readonly modifiers as appropriate

Example

Input:

{
  "id": 1,
  "name": "John"
}

Output:

interface User {
  id: number;
  name: string;
}

Tips

💡Format JSON first for better results
🔍Check nested object naming
📌Review array type inference