Free JSON to TypeScript Converter - Generate TypeScript Interfaces from JSON

Convert JSON to TypeScript Types and Interfaces Online - Fast & Accurate

TypeScript Output

⚡

Ready to Generate TypeScript Types

Paste JSON in the left panel or load a sample to get started

How to Convert JSON to TypeScript - Step by Step Guide

Transform your JSON data into TypeScript type definitions in 3 simple steps, with instant generation and one-click export

1

Step 1 – Paste Your JSON Data

Copy your JSON data from an API response, config file, or any JSON source and paste it into the input area. Our converter instantly validates and prepares it for type generation.

📋

Multiple Input Sources: Paste from API responses, config files, or use sample data to explore features

✅

Instant Validation: Real-time JSON syntax checking with error highlighting and fix suggestions

🔍

Complex Structures: Handles nested objects, arrays, unions, and deeply nested data structures

JSON Input

{
  "user": {
    "id": 12345,
    "username": "johndoe",
    "email": "[email protected]",
    "profile": {
      "firstName": "John",
      "lastName": "Doe",
      "age": 28,
      "isPremium": true
    }
  },
  "posts": [
    {
      "id": 1,
      "title": "First Post",
      "tags": [
        "typescript",
        "development"
      ]
    },
    {
      "id": 2,
      "title": "Second Post",
      "tags": [
        "javascript",
        "coding"
      ]
    }
  ]
}

2

Step 2 – Preview Generated TypeScript Types

Watch as TypeScript interfaces are automatically generated in real-time. Our intelligent type inference creates accurate, production-ready type definitions with proper naming conventions.

⚡

Real-time Generation: Types update instantly as you edit JSON - no manual conversion needed

🎯

Smart Type Inference: Accurately detects types including nested objects, arrays, unions, and optionals

📝

Clean Formatting: Properly formatted interfaces with consistent naming and indentation

Auto Generate→Real-time

TypeScript Output

interface Profile {
  firstName: string;
  lastName: string;
  age: number;
  isPremium: boolean;
}

interface User {
  id: number;
  username: string;
  email: string;
  profile: Profile;
}

interface Post {
  id: number;
  title: string;
  tags: string[];
}

interface RootObject {
  user: User;
  posts: Post[];
}

3

Step 3 – Download or Copy TypeScript Definition

Export your TypeScript types instantly. Download as a .d.ts file for your project or copy directly to your clipboard. Ready to use with full IDE autocomplete and type checking support.

📥

Download as .d.ts: Get a properly formatted TypeScript definition file for immediate use

📋

Copy to Clipboard: One-click copy for quick pasting into your TypeScript files

🔧

IDE Ready: Works seamlessly with VSCode, WebStorm, and all TypeScript-enabled editors

⚡One-click export - instant TypeScript definition download or copy

2 Options

📥

Download .d.ts

Save as TypeScript definition

📋

Copy Types

Copy to clipboard

💡Export your TypeScript types instantly - full IDE support and type checking included

JSON to TypeScript FAQs

Get answers to common questions about converting JSON to TypeScript

Why should I convert JSON to TypeScript interfaces?

Converting JSON to TypeScript interfaces provides strong type safety, enabling IDE autocomplete and catching type errors at compile time. Our converter automatically generates accurate TypeScript definitions from your JSON data, saving hours of manual work and improving code maintainability for large-scale applications.

How do I generate TypeScript types from API response JSON?

Simply paste your API response JSON into our converter to instantly generate corresponding TypeScript interfaces. The tool analyzes your data structure, infers types from values, and creates properly formatted definitions. You can download the .d.ts file or copy the code directly into your TypeScript project for immediate use.

Can this TypeScript converter handle nested JSON objects and arrays?

Yes, our JSON to TypeScript converter fully supports complex nested structures including deeply nested objects, arrays of objects, and optional properties. The converter creates separate interface definitions for each nested structure and properly references them in parent interfaces, ensuring complete type coverage.

What's the difference between TypeScript interfaces and types for JSON data?

Our converter generates interfaces by default because they're more extensible and better suited for object-oriented patterns in JSON data modeling. Interfaces support declaration merging and are preferred for defining object shapes from API responses, though you can modify the generated code to use type aliases if needed.

Is the generated TypeScript code production-ready?

Absolutely. The TypeScript definitions are production-ready and follow best practices, handling nullable values, optional properties, and proper naming conventions. You can immediately use the generated code in React, Angular, Vue, or Node.js projects with full IntelliSense support in VS Code and other IDEs.

JSON TOOLS

Format, validate and process JSON

EXPORT & SHARE

Export to other popular formats

IMPORT TO JSON

Convert to JSON from other types

CODE GENERATION

Generate code from JSON data

JSON to TypeScript