Free JSON to TypeScript Converter Online
Instantly generate TypeScript interfaces and types from JSON data. Our tool creates accurate type definitions with support for nested objects, arrays, and custom options. Perfect for TypeScript developers working with APIs and data structures.
Generate TypeScript Interfaces from JSON
Convert JSON to TypeScript with one click. Automatically infer types for strings, numbers, booleans, objects, and arrays. Customize with optional properties, readonly modifiers, and export keywords for immediate use in your TypeScript projects.
TypeScript Type Generator from JSON Data
Transform JSON objects into properly typed TypeScript code. Handles complex nested structures, mixed-type arrays, and generates PascalCase interface names. All processing happens locally in your browser for complete privacy.
Online TypeScript Interface Builder
Free TypeScript code generator from JSON. No registration required, completely client-side processing. Generate interfaces or types with full control over exports, optional properties, and readonly modifiers.
Key Features
- Generate TypeScript interfaces
- Create type definitions
- Nested object support
- Array type inference
- Optional properties
- Readonly modifiers
- Export types
- Browser-based processing
Frequently Asked Questions
What is the difference between interface and type in TypeScript?
Interfaces are primarily used for object shapes and can be extended or merged. Types are more flexible and can represent unions, intersections, and primitives. For most object structures from JSON, both work well, but interfaces are conventional.
How does the tool handle nested objects?
The tool automatically generates separate interfaces/types for nested objects with PascalCase names based on the property path. For example, a 'user' object with an 'address' property creates both User and UserAddress types.
Can it handle arrays with different types?
Yes! The tool detects mixed-type arrays and generates union types. For example, [1, 'hello', true] becomes (number | string | boolean)[].
What does the optional properties option do?
Enabling this adds the '?' modifier to all properties, making them optional in TypeScript. This is useful when working with partial data or API responses that may not include all fields.
Is my JSON data secure?
Absolutely! All conversion happens entirely in your browser. Your JSON data never leaves your device or gets sent to any server.
Can I use the generated code in production?
Yes! The generated TypeScript code is production-ready. However, always review it to ensure it matches your exact requirements, especially for complex nested structures or edge cases.