Stop writing TypeScript interfaces by hand — convert JSON automatically

How many times have you received a JSON response from an API and had to manually write TypeScript interfaces for it? I built a free tool that does it instantly: JSON to TypeScript Converter How it works Paste this JSON: { "id" : 1 , "name" : "Alice" , "email" : "alice@example.com" , "address" : { "street" : "123 Main St" , "city" : "Springfield" , "zip" : "62701" }, "orders" : [ { "id" : 101 , "total" : 29.99 , "status" : "shipped" } ] } Get this TypeScript: interface Address { street : string ; city : string ; zip : string ; } interface OrdersItem { id : number ; total : number ; status : string ; } interface Root { id : number ; name : string ; email : string ; address : Address ; orders : OrdersItem []; } It handles: Nested objects (creates separate interfaces) Arrays (infers element types) Mixed types ( string | number ) Null values ( unknown ) Why I built this I was building SnapAPI — a tool that creates instant REST APIs from JSON — and kept needing to convert API responses to Ty