Interfaces & Types

Summary

Defining the shape of your data models once and reusing that definition everywhere — your `User` or `Post` type should ideally be defined in exactly one place.

• 1Define an interface for your main data model and use it in both API responses and React props.
• 2Practice optional and readonly properties for fields that aren't always present.
• 3Learn when `type` and `interface` are interchangeable and when one is preferred.