Add an App Clip to an Expo App

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 testflight
uses 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

1. Set

bundleIdentifier

and

appleTeamId

bun create target

warns if these are missing. Add to

app.json

json

{
  "expo": {
    "ios": {
      "bundleIdentifier": "com.<username>.<app-name>",
      "appleTeamId": "XX57RJ5UTD"
    }
  }
}

2. Add the App Clip target

bun create target clip

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 plugin
```
targets/clip/Info.plist
```
— Clip Info.plist

targets/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

ios.icon

key.

3. Wire up associated domains

The parent app and the Clip each need the Associated Domains entitlement pointing at the domain that hosts the AASA file.

app.json

, add both

applinks:

(parent) and

appclips:

(Clip invocation) entries:

json

{
  "expo": {
    "ios": {
      "associatedDomains": [
        "applinks:may20.expo.app",
        "appclips:may20.expo.app"
      ]
    }
  }
}

targets/clip/expo-target.config.js

, declare the Clip's entitlement:

/** @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"],
  },
});

If you skip this,

expo prebuild

will print:

Apple App Clip may require the associated domains entitlement but none were found

4. Register bundle IDs and create the App Store entry

bunx setup-safari

This logs in to the Apple Developer account, registers

com.bacon.may20

, creates the App Store Connect entry, and prints:

A starter
```
apple-app-site-association
```
JSON
A
```
<meta name="apple-itunes-app">
```
tag with the iTunes app id
Team ID, iTunes ID, and Bundle ID

5. Host the AASA file

App Clips are invoked when iOS fetches

https://<your-domain>/.well-known/apple-app-site-association

and finds a matching

appclips

entry.

mkdir -p public/.well-known
touch public/.well-known/apple-app-site-association

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:

json

{
  "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"]
  }
}

Notes:

The file has no extension and no
Content-Type
requirements beyond being served as-is. Expo Router static export serves files in
```
public/
```
verbatim.
The
```
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/
Notation and route-disabling details: https://sosumi.ai/documentation/xcode/supporting-associated-domains

6. Add the Smart App Banner meta tag

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:

bunx expo customize src/app/+html.tsx

Add the meta tag to the

<head>

tsx

import { 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>
  );
}

To make the website show the App Clip card instead of the install card, use:

html

<meta
  name="apple-itunes-app"
  content="app-id=6771566491, app-clip-bundle-id=com.bacon.may20.clip, app-clip-display=card"
/>

7. Deploy the website

The AASA file must be live before iOS will trust the association. Use EAS Hosting:

bunx expo export -p web
eas deploy --prod

This publishes the site (including

/.well-known/apple-app-site-association

) at

https://<slug>.expo.app

. Verify:

curl https://may20.expo.app/.well-known/apple-app-site-association

8. Mirror permissions

Inspect the parent app's permissions after prebuild:

npx expo config --type introspect

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:

xml

<key>NSAppClip</key>
<dict>
  <key>NSAppClipRequestEphemeralUserNotification</key>
  <false/>
  <key>NSAppClipRequestLocationConfirmation</key>
  <true/>
</dict>

9. Build and submit to TestFlight

bunx testflight

This will:

Generate an
```
eas.json
```
if missing.
Set up credentials for both targets (parent + Clip). Each gets its own provisioning profile but can share a single Distribution Certificate.
Sync capabilities — note
```
Enabled: Associated Domains
```
for the Clip target.
Build, upload, and schedule a TestFlight submission.

10. Configure App Clip metadata

Pull existing App Store metadata to local:

eas metadata:pull

Add

apple.appClip

store.config.json

. Up to 3 invocation URLs can launch the Clip from a web page:

json

{
  "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"
          }
        }
      }
    }
  }
}

The

headerImage

must be a 1800x1200 PNG with no opacity.

Push back to the store:

eas metadata:push

Apple's recommended App Clip metadata guidelines: https://sosumi.ai/documentation/appclip/configuring-the-launch-experience-of-your-app-clip

What you get

Parent app target:
```
com.bacon.may20
```
App Clip target:
```
com.bacon.may20.clip
```
, lives in
```
targets/clip/
```

AASA hosted at

https://may20.expo.app/.well-known/apple-app-site-association

Smart App Banner meta tag on every web route
Every route linked to its native counterpart
TestFlight build of the parent app with the Clip embedded

Once Apple invokes the Clip from a URL on the domain, iOS opens

targets/clip/

's entry point which loads the React Native app.

Native detection (optional)

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.

References

./references/native-module.md — Local Expo module to detect App Clip context and present the SKOverlay install prompt

expo-app-clip

NPX Install

Tags

SKILL.md Content

Add an App Clip to an Expo App

1. Set
`bundleIdentifier`
and
`appleTeamId`

2. Add the App Clip target

3. Wire up associated domains

4. Register bundle IDs and create the App Store entry

5. Host the AASA file

6. Add the Smart App Banner meta tag

7. Deploy the website

8. Mirror permissions

9. Build and submit to TestFlight

10. Configure App Clip metadata

What you get

Native detection (optional)

References