JSON to TypeScript

What is JSON to TypeScript Conversion?

JSON to TypeScript conversion automatically generates TypeScript interface definitions from JSON objects. This is an essential tool for TypeScript developers who work with APIs, as it eliminates the tedious and error-prone task of manually writing type definitions.

When you receive JSON data from an API, you need TypeScript interfaces to ensure type safety in your application. This tool analyzes your JSON structure and instantly creates properly-typed interfaces, complete with nested objects and array types.

How to Use the JSON to TypeScript Converter

1. Paste your JSON object into the input area.
2. (Optional) Change the "Root Interface Name" to customize the main interface name.
3. Click Convert to generate the TypeScript code.
4. Copy the output and paste it into your .ts or .d.ts file.
5. Import and use the interfaces in your TypeScript code.

Example: JSON to TypeScript

Input JSON:

{
  "id": 123,
  "name": "John Doe",
  "email": "john@example.com",
  "isActive": true,
  "roles": ["admin", "user"],
  "profile": {
    "age": 30,
    "city": "New York"
  }
}

Generated TypeScript:

interface Profile {
  age: number;
  city: string;
}

interface RootObject {
  id: number;
  name: string;
  email: string;
  isActive: boolean;
  roles: string[];
  profile: Profile;
}

Key Features

• Nested Objects: Recursively generates interfaces for deeply nested structures.
• Array Type Detection: Intelligently analyzes array contents to determine correct types.
• Instant Preview: See the generated TypeScript code immediately.
• Privacy-Focused: All processing happens in your browser. No data sent to servers.
• Clean Output: Generates readable, properly formatted TypeScript code.

Why Use TypeScript Interfaces?

TypeScript interfaces provide numerous benefits:

• Type Safety: Catch errors at compile-time instead of runtime
• Autocomplete: Get intelligent code completion in your IDE
• Documentation: Interfaces serve as inline documentation
• Refactoring: Safely refactor code with confidence
• Team Collaboration: Clear contracts for data structures

Common Use Cases

• Typing API responses in React, Angular, or Vue applications
• Creating type definitions for third-party APIs
• Generating types for database query results
• Typing configuration files and JSON data
• Building type-safe data models

Related Tools

Explore other JSON and TypeScript tools:

• JSON Formatter - Format and validate JSON
• JSON to CSV Converter - Convert JSON to CSV
• JSON to YAML Converter - Convert JSON to YAML

Learn More

Check out our guides:

• Getting Started with JSON - JSON basics
• All Developer Guides - Browse all tutorials