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SKILL.md
npx skills add expo/skills --skill expo-app-clip
Framework (OSS). Add an iOS App Clip target to an Expo app. Use when the user mentions App Clip, AASA, apple-app-site-association, appclips, smart app banner, or wants to ship a lightweight iOS Clip invoked from a URL alongside their parent app.
npx skills add expo/skills --skill expo-app-clip
Requirements. Adding the App Clip target is open source. Shipping one requires an Apple Developer Program membership and App Store review, and the AASA file must be served over HTTPS on your domain (any HTTPS host works; EAS Hosting is one option). Building via EAS Build or
bunx testflightuses your EAS plan's build minutes. See https://expo.dev/pricing and https://developer.apple.com/app-clips/.
Adds an iOS App Clip target to an Expo project. The Clip lives in targets/clip/, ships alongside the parent app, and is invoked from a URL on the app's domain via an Apple App Site Association (AASA) file.
The parent app's bundle ID becomes com.<username>.<app-name> and the Clip's is automatically derived as <parent>.clip (e.g. com.bacon.may20.clip).
bundleIdentifier and appleTeamIdbun create target warns if these are missing. Add to app.json:
This installs @bacons/apple-targets, adds it to the plugins array in app.json, and writes:
targets/clip/expo-target.config.js — the target's config plugintargets/clip/Info.plist — Clip Info.plisttargets/clip/AppDelegate.swift, Assets.xcassets, etc.Pick a good icon or reuse the existing one defined in the app — check it with bunx expo config under the icon or ios.icon key.
The parent app and the Clip each need the Associated Domains entitlement pointing at the domain that hosts the AASA file.
In app.json, add both applinks: (parent) and appclips: (Clip invocation) entries:
In targets/clip/expo-target.config.js, declare the Clip's entitlement:
If you skip this,
expo prebuildwill print:Apple App Clip may require the associated domains entitlement but none were found.
This logs in to the Apple Developer account, registers com.bacon.may20, creates the App Store Connect entry, and prints:
apple-app-site-association JSON<meta name="apple-itunes-app"> tag with the iTunes app idApp Clips are invoked when iOS fetches https://<your-domain>/.well-known/apple-app-site-association and finds a matching appclips entry.
Paste the JSON setup-safari printed, but add an appclips block for the Clip's full app ID (<TeamID>.<ClipBundleID>). The output of setup-safari only covers the parent app:
Notes:
Content-Type requirements beyond being served as-is. Expo Router static export serves files in public/ verbatim.appclips block is what lets a URL on the domain launch the Clip.webcredentials is used for sharing credentials between the website, parent app, and the App Clip.activitycontinuation is optional and used for sharing the link between mobile and desktop. Must be used with Head from expo-router — see https://docs.expo.dev/router/advanced/apple-handoff/Create src/app/+html.tsx (Expo Router's HTML shell) and add the tag from setup-safari. Create the versioned template if it doesn't exist:
Add the meta tag to the <head>:
To make the website show the App Clip card instead of the install card, use:
The AASA file must be live before iOS will trust the association. Use EAS Hosting:
This publishes the site (including /.well-known/apple-app-site-association) at https://<slug>.expo.app. Verify:
Inspect the parent app's permissions after prebuild:
Look at the infoPlist object — mirror the permission keys in the App Clip's Info.plist so matching APIs can be used from the Clip.
Set deploymentTarget: "17.6" in the Clip's target config — App Clips have a higher minimum size limit in iOS 17.6.
If the app uses push notifications or location services, add to the App Clip's Info.plist to request the necessary permissions:
This will:
eas.json if missing.Enabled: Associated Domains for the Clip target.Pull existing App Store metadata to local:
Add apple.appClip to store.config.json. Up to 3 invocation URLs can launch the Clip from a web page:
The headerImage must be a 1800x1200 PNG with no opacity.
Push back to the store:
Apple's recommended App Clip metadata guidelines: https://sosumi.ai/documentation/appclip/configuring-the-launch-experience-of-your-app-clip
com.bacon.may20com.bacon.may20.clip, lives in targets/clip/https://may20.expo.app/.well-known/apple-app-site-associationOnce Apple invokes the Clip from a URL on the domain, iOS opens targets/clip/'s entry point which loads the React Native app.
To let JS detect when it's running inside an App Clip and present an install prompt for the full app, create a local Expo module (bunx create-expo-module --local) that exposes navigator.appClip.prompt().
See ./references/native-module.md for the Swift module, TypeScript interface, and usage.
If you encounter errors, misleading or outdated information in this skill, report it so Expo can improve:
Only submit when you have something specific and actionable to report. Include as much relevant context as possible. If an AI agent repeatedly failed or the user had to take over an Expo task, load the expo-skill-feedback skill and follow its eval-candidate flow instead of reusing the command above.
bun create target clip{
"expo": {
"ios": {
"associatedDomains": [
"applinks:may20.expo.app",
"appclips:may20.expo.app"
]
}
}
}/** @type {import('@bacons/apple-targets/app.plugin').ConfigFunction} */
module.exports = (config) => ({
type: "clip",
icon: "https://github.com/expo.png",
entitlements: {
"com.apple.developer.associated-domains": ["appclips:may20.expo.app"],
},
});bunx setup-safarimkdir -p public/.well-known
touch public/.well-known/apple-app-site-association{
"applinks": {
"details": [
{
"appIDs": ["XX57RJ5UTD.com.bacon.may20"],
"components": [{ "/": "*", "comment": "Matches all routes" }]
}
]
},
"appclips": {
"apps": ["XX57RJ5UTD.com.bacon.may20.clip"]
},
"activitycontinuation": {
"apps": ["XX57RJ5UTD.com.bacon.may20"]
},
"webcredentials": {
"apps": ["XX57RJ5UTD.com.bacon.may20"]
}
}bunx expo customize src/app/+html.tsximport { ScrollViewStyleReset } from "expo-router/html";
export default function Root({ children }: { children: React.ReactNode }) {
return (
<html lang="en">
<head>
<meta charSet="utf-8" />
<meta httpEquiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="apple-itunes-app" content="app-id=6771566491" />
<ScrollViewStyleReset />
</head>
<body>{children}</body>
</html>
);
}<meta
name="apple-itunes-app"
content="app-id=6771566491, app-clip-bundle-id=com.bacon.may20.clip, app-clip-display=card"
/>bunx expo export -p web
eas deploy --prodcurl https://may20.expo.app/.well-known/apple-app-site-associationnpx expo config --type introspect<key>NSAppClip</key>
<dict>
<key>NSAppClipRequestEphemeralUserNotification</key>
<false/>
<key>NSAppClipRequestLocationConfirmation</key>
<true/>
</dict>bunx testflighteas metadata:pull{
"configVersion": 0,
"apple": {
"appClip": {
"defaultExperience": {
"action": "PLAY",
"releaseWithAppStoreVersion": true,
"reviewDetail": {
"invocationUrls": ["https://may20.expo.app/", null, null]
},
"info": {
"en-US": {
"subtitle": "Instantly native with Expo",
"headerImage": "store/apple/app-clip/en-US/asc-app-clip.png"
}
}
}
}
}
}eas metadata:pushnpx --yes submit-expo-feedback@latest --category skills --subject "expo-app-clip" "<actionable feedback>"