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cap-go/capgo-skills

debugging-capacitor

Diagnoses and fixes runtime bugs in Capacitor iOS/Android apps - white/blank screen on launch, startup crashes, "X" plugin is not implemented on ios/android, net::ERRCLEARTEXTNOTPERMITTED, App Transport Security blocks, CORS on capacitor://localhost, permis…

Mode d’emploi

Copiez la commande et examinez le paquet avant de l’installer dans votre environnement agent.
Consultez le document original pour les outils, identifiants et environnements requis.
Décrivez les entrées et le livrable souhaité ; comparez la sortie aux sources.

npx skills add https://github.com/cap-go/capgo-skills --skill debugging-capacitor

Avant de commencer

L’installation n’inclut ni abonnement au modèle, ni quota API, ni accès aux fichiers.
Étoiles et installations reflètent l’activité, pas un test indépendant de qualité ou de sécurité.

Document Skill original

Rendu depuis le dépôt source en conservant titres, exemples, code, tableaux, liens et images.

Debugging Capacitor Apps

Find which layer is broken (web, bridge, native, OS config), prove it with the right inspector, then fix the smallest thing.

When to Use

TRIGGER when:

App shows a white/blank screen, crashes on launch, or freezes after a native call.
Error "<Name>" plugin is not implemented on ios|android or "<Name>.<method>()" is not implemented on ....
Network calls fail on device only: net::ERR_CLEARTEXT_NOT_PERMITTED, ATS "requires the use of a secure connection", CORS errors.
Permission prompts never appear or always deny.
Live reload (cap run --url, server.url) shows a blank page or "Webpage not available".
After updating to Capacitor 8.5+ / Xcode 27: appUrlOpen silent, universal links open the app but do nothing, JS pause/resume or custom AppDelegate code no longer runs.
User asks "how do I debug / inspect my Capacitor app".

Do not use:

Only need to stream, filter, or save logs or crash reports -> ios-android-logs.
Performing the AppDelegate -> SceneDelegate migration itself -> capacitor-uiscene-migration.
Setting up deep links, AASA, assetlinks from scratch -> capacitor-deep-linking.
Jank, slow startup, bundle size, memory tuning -> capacitor-performance.
Sentry / Crashlytics / Datadog in production -> capacitor-native-observability.
Writing unit/E2E tests -> capacitor-testing. AI/MCP device automation -> capacitor-mcp.
Gradle/Xcode build failures from version bumps -> capacitor-app-upgrades; Pods/SPM resolution -> cocoapods-to-spm.
Push token/delivery issues -> capacitor-push-notifications; keyboard overlap -> capacitor-keyboard; notch/insets -> safe-area-handling.

Triage Workflow

Collect facts before touching code: platform(s), simulator vs device, debug vs release, Capacitor version (npx cap doctor), what changed last (upgrade, plugin added, config edit), exact error text.
Classify the layer:

JS exception, failed fetch, bad route -> web layer: open the WebView inspector (Safari / chrome://inspect). See references/webview-inspection.md.
plugin is not implemented -> bridge/registration: the native code is not in the binary or JS cannot be injected. See Error Handling below.
Process dies / EXC_BAD_ACCESS / FATAL EXCEPTION -> native layer: run from Xcode / Android Studio with the debugger attached. See references/native-debugging.md.
Works on Android but not iOS after 8.5/Xcode 27, link/lifecycle related -> UIScene. See references/uiscene-regressions.md.

Reproduce with a fresh sync: npm run build && npx cap sync then rebuild native. Stale public/ assets and un-synced plugins cause most "works in browser, broken on device" reports.
Read the native console for Capacitor's own messages. iOS prints ⚡️ Loading app at ..., ⚡️ [log] - ..., ⚡️ ERROR: Unable to load ... to stdout (visible in Xcode's console, simctl launch --console-pty, devicectl ... launch --console; not in Console.app). Android logs under tag Capacitor and JS console under Capacitor/Console. Log commands live in ios-android-logs.
Report the root cause and proposed fix to the user before invasive changes (deleting ios//android/, editing project.pbxproj, disabling ATS globally).
Apply the fix, then run the Verification steps.

Tool Matrix

Need	iOS	Android
Inspect DOM/JS/network	Safari > Develop > device > app	`chrome://inspect/#devices`
Native breakpoints	Xcode (`npx cap open ios`), LLDB	Android Studio debugger (`npx cap open android`)
Run on target from CLI	`npx cap run ios --target <id>`	`npx cap run android --target <id>`
List targets	`npx cap run ios --list`	`npx cap run android --list`
Open URL / deep link	`xcrun simctl openurl booted <url>`; device: `xcrun devicectl device process openURL --device <id> <url>`	`adb shell am start -W -a android.intent.action.VIEW -d "<url>" <appId>`
Reset/grant permissions (sim)	`xcrun simctl privacy booted reset all <appId>`	`adb shell pm revoke <appId> android.permission.CAMERA` / `adb shell pm clear <appId>`
Fake push (sim)	`xcrun simctl push booted <appId> payload.json`	send a real FCM message
Launch with stdout	`xcrun simctl launch --console-pty booted <appId>`; device: `xcrun devicectl device process launch --console --device <id> <appId>`	`adb logcat`
Profile	Instruments / `xcrun xctrace record --template 'Time Profiler'`	Android Studio Profiler

Details and caveats: references/device-cli.md.

Live Reload Quick Path

Capacitor 9 (@next): npx cap run ios --url http://192.168.1.68:5173. The old -l/--live-reload, --host, --port, --https flags are removed.
Capacitor 8.5 (stable): npx cap run ios -l --host 192.168.1.68 --port 5173 (add --https for an https dev server).
Android emulator/USB: --forwardPorts 5173:5173 runs adb reverse so http://localhost:5173 works.
Dev server must bind to 0.0.0.0; phone and Mac on the same Wi-Fi; iOS may ask for Local Network access; if denied the page never loads (re-enable in Settings > Privacy & Security > Local Network).
Never ship server.url / server.cleartext in capacitor.config.*; grep before release.

Error Handling

Error / symptom	Likely cause	Fix
`"Foo" plugin is not implemented on ios`	Plugin not in native project, or JS injection blocked	`npm i <plugin>` -> `npx cap sync ios`. SPM: check `ios/App/CapApp-SPM/Package.swift` lists it; CocoaPods: check `ios/App/Podfile`. Remove `WKAppBoundDomains` from Info.plist or set `ios.limitsNavigationsToAppBoundDomains: true`.
`"Foo" plugin is not implemented on android`	Gradle not synced, or a service worker intercepts the page	`npx cap sync android`, then File > Sync Project with Gradle Files. Disable/unregister service workers in the native build.
`"Foo.bar()" is not implemented on web`	Calling a native-only method in the browser	Guard with `Capacitor.isNativePlatform()` / `Capacitor.isPluginAvailable('Foo')`.
`⚡️ ERROR: Unable to load .../index.html` / white screen	`webDir` wrong or never copied	Build web, verify `webDir` matches output folder, `npx cap copy`.
White screen, no native error	JS crash before first render, or bad `<base href>` / absolute asset paths	Inspect WebView console; use relative/root paths that resolve under `capacitor://localhost` / `https://localhost`.
`net::ERR_CLEARTEXT_NOT_PERMITTED`	Android blocks HTTP (API 28+)	Use HTTPS. For dev only: `server.cleartext: true` or a `network_security_config.xml` scoped to the dev host.
"The resource could not be loaded because the App Transport Security policy requires the use of a secure connection."	iOS ATS	Use HTTPS. For dev only: `NSExceptionDomains` for the dev host, not global `NSAllowsArbitraryLoads`.
CORS error from API on device only	Origin is `capacitor://localhost` (iOS) / `https://localhost` (Android)	Allow those origins server-side, or enable `CapacitorHttp` (`plugins.CapacitorHttp.enabled: true`) to route `fetch`/XHR natively.
Crash on permission request (iOS, `This app has crashed because it attempted to access privacy-sensitive data without a usage description`)	Missing `NS*UsageDescription`	Add the key to `ios/App/App/Info.plist`.
Permission always `denied` on Android	Missing `<uses-permission>` or user chose "Don't allow" twice	Add to `AndroidManifest.xml`; guide user to settings.
`No such module 'Capacitor'` (Xcode)	Opened `.xcodeproj` with CocoaPods, or SPM packages not resolved	Pods: open `App.xcworkspace`, `npx cap sync ios`. SPM: File > Packages > Reset Package Caches. Deeper -> `cocoapods-to-spm`.
`Unable to boot device in current state: Booted`	Simulator already running	Not an error; use `booted` as the device id.
`appUrlOpen` / universal links silent on iOS only after 8.5	AppDelegate `open url` / `continue userActivity` no longer called	See `references/uiscene-regressions.md`.
JS `pause`/`resume` stop firing	Custom SceneDelegate missing proxy forwarding, or logic left in `applicationDidEnterBackground`	See `references/uiscene-regressions.md`.

More symptom-specific fixes: references/common-failures.md.

Verification

After any fix, prove it:

npx cap doctor shows matching @capacitor/core, cli, ios, android versions.
npm run build && npx cap sync completes with no warnings about missing plugins.
Native console shows ⚡️ Loading app at capacitor://localhost... (iOS) / no Capacitor/Console errors (Android).
WebView inspector console is clean on launch.
Re-run the exact repro on both a simulator/emulator and a physical device, in a release build if the bug was release-only (cap run builds Debug by default; iOS accepts --configuration Release, Android release builds go through Android Studio or Gradle).
For link/lifecycle fixes: test cold (app killed) and warm (app backgrounded) launch with simctl openurl / adb shell am start, and background/foreground once to see pause and resume.
Before shipping: grep -n "server" capacitor.config.* shows no url/cleartext left over.

References

Only load a reference when its topic is in play.

File	Load when
`references/webview-inspection.md`	Attaching Safari/Chrome inspectors, inspector shows no app, debugging release builds, early-startup JS errors
`references/native-debugging.md`	Native crash, breakpoints in plugins, LLDB, Android Studio debugger, Instruments/xctrace, memory leaks
`references/device-cli.md`	Driving simulators/devices from the terminal: install, launch, open URLs, permissions, push, app containers
`references/uiscene-regressions.md`	iOS deep links, universal links, cold-start URL, pause/resume, or AppDelegate code broken after Capacitor 8.5 / Xcode 27
`references/common-failures.md`	Detailed fixes for white screen, plugin not implemented, networking, permissions, live reload

Resources

https://capacitorjs.com/docs/ios/troubleshooting
https://capacitorjs.com/docs/android/troubleshooting
https://capacitorjs.com/docs/guides/live-reload
https://capacitorjs.com/docs/updating/8-5
https://capacitorjs.com/docs/cli/commands/run

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