JSON to TypeScript Converter

Paste your JSON and get clean TypeScript interfaces instantly. Supports nested objects, arrays, and complex types.

Root Name

interfacetype

input.json

types.ts

export interface Address {
  street: string;
  city: string;
  zipCode: string;
}

export interface Order {
  orderId: number;
  total: number;
  items: string[];
}

export interface Root {
  id: number;
  name: string;
  email: string;
  isActive: boolean;
  address: Address;
  roles: string[];
  orders: Order[];
}

Why Convert JSON to TypeScript?

TypeScript interfaces provide compile-time type checking, autocomplete, and documentation for your JSON data structures. This eliminates runtime errors and makes your code more maintainable.

✨ Features

Nested Objects: Automatically creates separate interfaces for nested structures.
Array Detection: Detects array element types and generates proper typed arrays.
Interface vs Type: Choose between interface and type syntax.
Custom Root Name: Name your root type anything you want.
Smart Naming: Auto-generates meaningful names for nested types.

Frequently Asked Questions

Interface vs Type — which should I use?

Use interface for object shapes (they support declaration merging). Use type for unions, intersections, and more complex types.

Does this handle deeply nested JSON?

Yes! The converter recursively processes all levels of nesting and creates separate interfaces for each unique object shape.