1--- 2title: 'Expo Modules API: Get started' 3sidebar_title: Get started 4description: Learn about getting started with Expo modules API. 5--- 6 7import { BoxLink } from '~/ui/components/BoxLink'; 8import { Terminal } from '~/ui/components/Snippet'; 9 10There are two ways to get started with the Expo Module API: you can either initialize a new module from scratch or add the Expo Module API to an existing module. This guide will walk you through creating a new module from scratch, and the [Integrating in an existing library guide](/modules/existing-library) covers the latter case. 11 12## 1. Creating a new module 13 14To create a new Expo module from scratch, run the `create-expo-module` script as shown below. 15The script will ask you a few questions and then generate the native Expo module along with the example app for Android and iOS that uses your new module. 16 17<Terminal cmd={[`$ npx create-expo-module my-module`]} /> 18 19## 2. Running the example project 20 21Navigate to the module directory and then open the Android and/or iOS example project by running the following commands: 22 23<Terminal cmd={[`$ cd my-module`, `$ npm run open:android`, `$ npm run open:ios`]} /> 24 25Now, you can run the example project on your device or simulator/emulator. When the project compiles and runs, you will see "Hello world! ��" on the screen. 26 27> **Note:** If you're using Windows, you can open the example project by opening the **android** directory in Android Studio, but you cannot open the iOS project files. 28 29## 3. Making a change 30 31### Android 32 33Open up **MyModuleModule.kt** in Android Studio (<kbd>⌘ Cmd</kbd> + <kbd>O</kbd> or <kbd>Ctrl</kbd> + <kbd>O</kbd> and search for **MyModuleModule.kt**). Change the `hello` method to return a different string. For example, you can change it to return `"Hello world! ����"`. Rebuild the app and you should see your change. 34 35### iOS 36 37Open up **MyModuleModule.swift** in Xcode (<kbd>⌘ Cmd</kbd> + <kbd>O</kbd> or <kbd>Ctrl</kbd> + <kbd>O</kbd> and search for **MyModuleModule.swift**). Change the `hello` method to return a different string. For example, you can change it to return `"Hello world! ����"`. Rebuild the app and you should see your change. 38 39## Next steps 40 41Now that you've learned how to initialize a module and make simple changes to it, you can continue to a tutorial or dive right into the API reference. 42 43<BoxLink 44 title="Creating your first native module" 45 description="Create a simple, but complete, native module to interact with Android and iOS preferences APIs." 46 href="/modules/native-module-tutorial" 47/> 48 49<BoxLink 50 title="Module API Reference" 51 description="Outline for the Expo Module API and common patterns like sending events from native code to JavaScript." 52 href="/modules/module-api" 53/> 54