01
Paste or upload JSON
Add any JSON object or array to the input panel. Use the sample button to load a realistic API response with nested objects and arrays.
TypeScript generator
JSON to TypeScript Interface Generator
Convert JSON objects and API responses into TypeScript interfaces instantly. Nested objects become named interfaces, arrays of objects produce typed generics, and you can export type aliases or interfaces — all client-side with zero upload.
100% client sideNested interfacesDownload .ts
How to generate TypeScript interfaces from JSON
Three steps02
Tune generation options
Choose interface or type alias, toggle key sorting, and set the root interface name to match your codebase convention.
03
Copy or download .ts file
Interfaces update live as you type. Copy the output or download a ready-to-import .ts file.
Built for TypeScript developers
Stop writing interfaces by hand. Paste a JSON API response and get typed interfaces in seconds, ready for your TypeScript project.
100% client side
Your JSON never leaves the browser. No upload, no server, no logs.
Live generation
TypeScript interfaces update as you type with clear error messages for invalid JSON.
Nested interfaces
Objects within objects each get their own named interface in PascalCase.
Array generics
Arrays of objects produce a typed item interface and a typed array alias.
Type aliases
Toggle between interface and type alias declarations to match your project style.
Download .ts file
Export all generated interfaces as a ready-to-import TypeScript file.
Frequently asked questions
7 answersTypeScript Interface Generator from JSON
This tool infers TypeScript types from JSON values: strings become string, numbers become number, booleans become boolean, and null becomes null. Objects generate named interfaces derived from the property key in PascalCase. Arrays of objects merge all item shapes and produce a typed item interface. You can switch to type aliases, sort keys alphabetically, and rename the root interface to match your project conventions.