Networking

Every app needs to talk to the internet. On Android, you use Retrofit. On iOS, you use URLSession. Two different libraries, two different APIs, two different codebases. In KMP, you use Ktor Client — one networking library that works on every platform. Write your API calls once in commonMain, and they work on Android, iOS, Desktop, and Web. What is Ktor? Ktor is a networking framework by JetBrains (the same team behind Kotlin). The client side lets you make HTTP requests from shared code. ...

Every real app needs data from the internet. A weather app calls a weather API. A social app loads posts from a server. A store app fetches products from a backend. Retrofit is the most popular library for making HTTP requests in Android. In this tutorial, you will learn how to use it with Compose to build a screen that loads, displays, and handles errors from a real API. What is Retrofit? Retrofit is an HTTP client library by Square. It turns your API into a Kotlin interface: ...