JSON to TypeScript Interface Converter

When building TypeScript applications that consume REST APIs (built with ASP.NET Core, Node.js, or any backend), you often need to define TypeScript interfaces that match the JSON response shape. This tool automates that process — paste any JSON and get a ready-to-use TypeScript interface in seconds.

What This Tool Generates

• Strongly-typed TypeScript interface declarations
• Nested interfaces for complex objects
• Array types like string[] or User[]
• Nullable types for null values
• Infers string, number, boolean, object, any, null

Use Cases

• Converting API response JSON to TypeScript models in Angular, React, or Vue projects
• Generating types from ASP.NET Core API responses
• Creating typed models for Axios or Fetch responses
• Replacing any types with strongly-typed interfaces