Use App Check with the debug provider on Apple platforms
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If, after you have registered your app for App Check, you want to run your
app in an environment that App Check would normally not classify as valid,
such as a simulator or device during development, or from a continuous
integration (CI) environment, you can create a debug build of your app that uses
the App Check debug provider instead of a real attestation provider.
Use the debug provider in development
To use the debug provider while running your app interactively
(during development, for example), do the following:
In your debug build, before using any Firebase backend services, create and
set the App Check debug provider factory:
FIRAppCheckDebugProviderFactory*providerFactory=[[FIRAppCheckDebugProviderFactoryalloc]init];[FIRAppChecksetAppCheckProviderFactory:providerFactory];// Use Firebase library to configure APIs[FIRAppconfigure];
Enable debug logging in your Xcode project (v11.0 or newer):
Open Product > Scheme > Edit scheme.
Select Run from the left menu, then select the Arguments tab.
In the Arguments Passed on Launch section, add -FIRDebugEnabled.
Launch the app. A local debug token will be logged when the SDK tries to
send a request to the backend. For example:
In the App Check section
of the Firebase console, choose Manage debug tokens from your app's
overflow menu. Then, register the debug token you logged in the previous
step.
After you register the token, Firebase backend services will accept it as valid.
Because this token allows access to your Firebase resources without a
valid device, it is crucial that you keep it private. Don't commit it to a
public repository, and if a registered token is ever compromised, revoke it
immediately in the Firebase console.
Use the debug provider in a CI environment
To use the debug provider in a continuous integration (CI) environment, do the
following:
In the App Check section
of the Firebase console, choose Manage debug tokens from your app's
overflow menu. Then, create a new debug token. You'll need the token in the
next step.
Because this token allows access to your Firebase resources without
a valid device, it is crucial that you keep it private. Don't commit it to a
public repository, and if a registered token is ever compromised, revoke it
immediately in the Firebase console.
Add the debug token you just created to your CI system's secure key store
(for example, GitHub Actions' encrypted secrets
or Travis CI's encrypted variables).
If necessary, configure your CI system to make your debug token available
within the CI environment as an environment variable. Name the variable
something like APP_CHECK_DEBUG_TOKEN_FROM_CI.
In Xcode, add an environment variable to your testing scheme with the name
FIRAAppCheckDebugToken and something like $(APP_CHECK_DEBUG_TOKEN) as
the value.
Configure your CI test script to pass the debug token as an environment
variable. For example:
xcodebuild test -scheme YourTestScheme -workspace YourProject.xcworkspace \
APP_CHECK_DEBUG_TOKEN=$(APP_CHECK_DEBUG_TOKEN_FROM_CI)
In your debug build, before using any Firebase backend services, create and
set the App Check debug provider factory:
FIRAppCheckDebugProviderFactory*providerFactory=[[FIRAppCheckDebugProviderFactoryalloc]init];[FIRAppChecksetAppCheckProviderFactory:providerFactory];// Use Firebase library to configure APIs[FIRAppconfigure];
When your app runs in a CI environment, Firebase backend services will accept
the token it sends as valid.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[],[],null,["If, after you have registered your app for App Check, you want to run your\napp in an environment that App Check would normally not classify as valid,\nsuch as a simulator or device during development, or from a continuous\nintegration (CI) environment, you can create a debug build of your app that uses\nthe App Check debug provider instead of a real attestation provider.\n| **Warning:** The debug provider allows access to your Firebase resources from unverified devices. **Don't** use the debug provider in production builds of your app, and be careful not to leak your debug token.\n\nUse the debug provider in development\n\nTo use the debug provider while running your app interactively\n(during development, for example), do the following:\n\n1. In your debug build, before using any Firebase backend services, create and\n set the App Check debug provider factory:\n\n Swift \n\n ```swift\n let providerFactory = AppCheckDebugProviderFactory()\n AppCheck.setAppCheckProviderFactory(providerFactory)\n\n FirebaseApp.configure()\n ```\n\n Objective-C \n\n ```objective-c\n FIRAppCheckDebugProviderFactory *providerFactory =\n [[FIRAppCheckDebugProviderFactory alloc] init];\n [FIRAppCheck setAppCheckProviderFactory:providerFactory];\n\n // Use Firebase library to configure APIs\n [FIRApp configure];\n ```\n2. Enable debug logging in your Xcode project (v11.0 or newer):\n\n 1. Open **Product \\\u003e Scheme \\\u003e Edit scheme**.\n 2. Select **Run** from the left menu, then select the **Arguments** tab.\n 3. In the **Arguments Passed on Launch** section, add `-FIRDebugEnabled`.\n3. Launch the app. A local debug token will be logged when the SDK tries to\n send a request to the backend. For example:\n\n ```\n [Firebase/AppCheck][I-FAA001001] Firebase App Check Debug Token:\n 123a4567-b89c-12d3-e456-789012345678\n ```\n4. In the [**App Check**](//console.firebase.google.com/project/_/appcheck) section\n of the Firebase console, choose **Manage debug tokens** from your app's\n overflow menu. Then, register the debug token you logged in the previous\n step.\n\nAfter you register the token, Firebase backend services will accept it as valid.\n\nBecause this token allows access to your Firebase resources without a\nvalid device, it is crucial that you keep it private. Don't commit it to a\npublic repository, and if a registered token is ever compromised, revoke it\nimmediately in the Firebase console.\n\nUse the debug provider in a CI environment\n\nTo use the debug provider in a continuous integration (CI) environment, do the\nfollowing:\n\n1. In the [**App Check**](//console.firebase.google.com/project/_/appcheck) section\n of the Firebase console, choose **Manage debug tokens** from your app's\n overflow menu. Then, create a new debug token. You'll need the token in the\n next step.\n\n Because this token allows access to your Firebase resources without\n a valid device, it is crucial that you keep it private. Don't commit it to a\n public repository, and if a registered token is ever compromised, revoke it\n immediately in the Firebase console.\n\n2. Add the debug token you just created to your CI system's secure key store\n (for example, GitHub Actions' [encrypted secrets](https://docs.github.com/en/actions/reference/encrypted-secrets)\n or Travis CI's [encrypted variables](https://docs.travis-ci.com/user/environment-variables/#defining-encrypted-variables-in-travisyml)).\n\n3. If necessary, configure your CI system to make your debug token available\n within the CI environment as an environment variable. Name the variable\n something like `APP_CHECK_DEBUG_TOKEN_FROM_CI`.\n\n4. In Xcode, add an environment variable to your testing scheme with the name\n `FIRAAppCheckDebugToken` and something like `$(APP_CHECK_DEBUG_TOKEN)` as\n the value.\n\n5. Configure your CI test script to pass the debug token as an environment\n variable. For example:\n\n ```\n xcodebuild test -scheme YourTestScheme -workspace YourProject.xcworkspace \\\n APP_CHECK_DEBUG_TOKEN=$(APP_CHECK_DEBUG_TOKEN_FROM_CI)\n ```\n6. In your debug build, before using any Firebase backend services, create and\n set the App Check debug provider factory:\n\n Swift \n\n ```swift\n let providerFactory = AppCheckDebugProviderFactory()\n AppCheck.setAppCheckProviderFactory(providerFactory)\n\n FirebaseApp.configure()\n ```\n\n Objective-C \n\n ```objective-c\n FIRAppCheckDebugProviderFactory *providerFactory =\n [[FIRAppCheckDebugProviderFactory alloc] init];\n [FIRAppCheck setAppCheckProviderFactory:providerFactory];\n\n // Use Firebase library to configure APIs\n [FIRApp configure];\n ```\n\nWhen your app runs in a CI environment, Firebase backend services will accept\nthe token it sends as valid."]]
