Example

Input JSON:

{"name": "Alice", "age": 30, "active": true, "tags": ["dev", "admin"]}

Output TypeScript:

interface Root { name: string; age: number; active: boolean; tags: string[]; }

Why Generate TypeScript from JSON?

TypeScript interfaces provide compile-time type safety for your JavaScript code. When working with APIs that return JSON data, defining proper TypeScript interfaces ensures your code correctly handles the data structure — catching errors before they reach production.

Manually writing interfaces for complex API responses is tedious and error-prone. This tool automates the process by analyzing your JSON data and generating accurate TypeScript interfaces with proper types for strings, numbers, booleans, arrays, and nested objects.

How It Works

Paste a sample JSON response from your API
The tool analyzes each property's value to determine its TypeScript type
Nested objects become separate interfaces with proper references
Arrays are typed based on their contents (e.g., string[], number[])
Null values are marked as any (since the type can't be inferred)

Best Practices

For best results, use a complete JSON sample that includes all possible fields. The generated interfaces serve as a starting point — you may want to add optional markers (?), union types, or rename interfaces to match your project conventions.

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JSON to TypeScript Generator