JSON to TypeScript Converter

Convert JSON data to TypeScript interfaces or type aliases with automatic nested type generation

Additional Options

Root Interface Name

Make all properties optional (?)

JSON Input

TypeScript Output

TypeScript Generation Guide

Type Mappings:

• JSON string → TypeScript string

• JSON number → TypeScript number

• JSON boolean → TypeScript boolean

• JSON null → TypeScript null

• JSON object → TypeScript interface

• JSON array → TypeScript Type[]

Best Practices:

• Use interfaces for object shapes

• Use Type[] syntax for arrays

• Name interfaces in PascalCase

• Mark uncertain fields as optional

• Export interfaces for reusability

• Nested objects create sub-interfaces

Tip: For API responses, use the actual endpoint name as the root interface name (e.g., "UserResponse", "ProductList"). This makes your code more readable and maintainable.

About the JSON to TypeScript Converter

Convert JSON data to TypeScript interfaces or types instantly. Perfect for TypeScript developers working with APIs, creating type definitions, and ensuring type safety in your applications.

Features:

Generate TypeScript interfaces or type aliases
Handle nested objects and arrays
Automatic interface naming with PascalCase
Optional vs required field markers
Multiple array syntax options (Type[] or Array<Type>)
Support for primitive types and union types
Export statements included
Copy to clipboard functionality

Use Cases:

Creating type definitions from API responses
Generating interfaces for configuration files
Type-safe data modeling
Converting JSON schemas to TypeScript
API documentation and client generation
Rapid prototyping with type safety
Database schema to TypeScript mapping

Supported Types:

Primitives: string, number, boolean, null
Objects: nested interfaces
Arrays: typed arrays with proper syntax
Union types: for mixed-type arrays
Optional properties: with ? notation

Output Options:

Interface: Standard TypeScript interface declarations
Type: Type alias declarations (more flexible)
Array Syntax: Choose between Type[] or Array<Type>
Optional Fields: Mark all fields as optional or required