Type vs Interface in TypeScript: The Easiest Explanation for Frontend Engineers in 2026

If you are a frontend developer and you are using TypeScript, you have probably asked yourself: "Should I use type or interface?" At first they look exactly same. They both help you define how you want an object to look so your code doesn't crash. But as your React or Next.js project gets bigger, those small differences start to matter, performance and clean coding. I will explain these differences in this article so you can choose which one to use in less than 5 minutes 1. The Quick Comparison