JSON → TypeScript Converter

About the JSON → TypeScript Converter

This tool allows developers to take raw JSON objects—like API responses, configuration files, or mock data— and instantly generate clean, strongly typed TypeScript interfaces. Instead of writing types by hand, you can copy and paste JSON and get ready-to-use definitions.

Key Benefits

Example Use Case

Suppose your API returns the following JSON:

[
  { "id": 1, "status": "open", "user": { "name": "Ada" } },
  { "id": 2, "status": "closed", "user": { "name": "Grace", "email": "g@x.dev" } }
]

The tool will generate TypeScript types like:

export interface Root extends Array<RootItem> {}
export interface RootItem {
    id: number
    status: "open" | "closed"
    user: User
}

export interface User {
    name: string
    email?: string
}

Notice how email becomes optional (email?: string) because it's not present in every object.

When to Use

• Quickly typing new API endpoints during frontend development
• Generating models for mock data or testing
• Documenting backend responses for better DX
• Refactoring untyped JavaScript projects to TypeScript

FAQ