JSON to TypeScript

About JSON to TypeScript

Manually writing TypeScript interfaces for API responses is tedious and error-prone. This tool automatically generates strongly-typed interfaces from any JSON data, saving time and reducing bugs.

Features

• Nested objects: Automatically creates separate interfaces for nested objects
• Arrays: Detects array element types, including arrays of objects
• Null handling: Generates union types (string | null) for nullable fields
• Interface vs type: Choose between interface declarations and type aliases
• Modifiers: Optional export, readonly, and optional (?) modifiers

FAQ

interface vs type — which should I use?

Use interface for object shapes (most API responses, models). Interfaces support declaration merging and extending. Use type for unions, intersections, mapped types, and when you need more flexibility. For generated types, either works.