Expo Docs MCP Server

--- title: Font description: A library that allows loading fonts at runtime and using them in React Native components. sourceCodeUrl: https://github.com/expo/expo/tree/sdk-51/packages/expo-font packageName: expo-font iconUrl: /static/images/packages/expo-font.png platforms: ["android", "ios", "tvos", "web"] --- import { ConfigReactNative, ConfigPluginExample, ConfigPluginProperties, } from '~/ui/components/ConfigSection'; `expo-font` allows loading fonts from the web and using them in React Native components. See more detailed usage information in the [Fonts](/develop/user-interface/fonts/) guide. ## Installation ## Configuration in app config You can configure `expo-font` using its built-in [config plugin](/config-plugins/introduction/) if you use config plugins in your project ([EAS Build](/build/introduction) or `npx expo run:[android|ios]`). The plugin allows you to configure various properties that cannot be set at runtime and require building a new app binary to take effect. ```json app.json { "expo": { "plugins": [ [ "expo-font", { "fonts": ["path/to/file.ttf"] } ] ] } } ``` - **Android:** Copy font files to **android/app/src/main/assets/fonts**. - **iOS**: See [Adding a Custom Font to Your App](https://developer.apple.com/documentation/uikit/adding-a-custom-font-to-your-app) in the Apple Developer documentation. ## Usage ```tsx /* @info Import useFonts hook from 'expo-font'. */ import { useFonts } from 'expo-font'; /* @end */ /* @info Also, import SplashScreen so that when the fonts are not loaded, we can continue to show SplashScreen. */ import * as SplashScreen from 'expo-splash-screen'; /* @end */ /* @info This prevents SplashScreen from auto hiding while the fonts are loaded. */ SplashScreen.preventAutoHideAsync(); /* @end */ const [loaded, error] = useFonts({ 'Inter-Black': require('./assets/fonts/Inter-Black.otf'), }); useEffect(() => { if (loaded || error) { /* @info After the custom fonts have loaded, we can hide the splash screen and display the app screen. */ SplashScreen.hideAsync(); /* @end */ } }, [loaded, error]); if (!loaded && !error) { return null; } return ( <View style={styles.container}> <Text style={{ fontFamily: 'Inter-Black', fontSize: 30 }}>Inter Black</Text> <Text style={{ fontSize: 30 }}>Platform Default</Text> </View> ); } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', }, }); ``` ## API ```js ``` ## Error codes | Code | Description | | ------------------- | ----------------------------------------------------------------- | | ERR_FONT_API | If the arguments passed to `loadAsync` are invalid. | | ERR_FONT_SOURCE | The provided resource was of an incorrect type. | | ERR_WEB_ENVIRONMENT | The browser's `document` element doesn't support injecting fonts. | | ERR_DOWNLOAD | Failed to download the provided resource. | | ERR_FONT_FAMILY | Invalid font family name was provided. | | ERR_UNLOAD | Attempting to unload fonts that haven't finished loading yet. |