voluptasmollitia/docs-exp/app.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/app](./app.md)

## app package

Firebase App

## Remarks

This package coordinates the communication between the different Firebase components

## Functions

|  Function | Description |
|  --- | --- |
|  [deleteApp(app)](./app.deleteapp.md) | Renders this app unusable and frees the resources of all associated services. |
|  [getApp(name)](./app.getapp.md) | Retrieves a FirebaseApp instance.<!-- -->When called with no arguments, the default app is returned. When an app name is provided, the app corresponding to that name is returned.<!-- -->An exception is thrown if the app being retrieved has not yet been initialized. |
|  [getApps()](./app.getapps.md) | A (read-only) array of all initialized apps. |
|  [initializeApp(options, name)](./app.initializeapp.md) | Creates and initializes a FirebaseApp instance.<!-- -->See [Add Firebase to your app](https://firebase.google.com/docs/web/setup#add_firebase_to_your_app) and [Initialize multiple projects](https://firebase.google.com/docs/web/setup#multiple-projects) for detailed documentation. |
|  [initializeApp(options, config)](./app.initializeapp_1.md) | Creates and initializes a FirebaseApp instance. |
|  [onLog(logCallback, options)](./app.onlog.md) | Sets log handler for all Firebase SDKs. |
|  [registerVersion(libraryKeyOrName, version, variant)](./app.registerversion.md) | Registers a library's name and version for platform logging purposes. |
|  [setLogLevel(logLevel)](./app.setloglevel.md) | Sets log level for all Firebase SDKs.<!-- -->All of the log types above the current log level are captured (i.e. if you set the log level to <code>info</code>, errors are logged, but <code>debug</code> and <code>verbose</code> logs are not). |

## Interfaces

|  Interface | Description |
|  --- | --- |
|  [FirebaseApp](./app.firebaseapp.md) | A FirebaseApp holds the initialization information for a collection of services.<!-- -->Do not call this constructor directly. Instead, use [initializeApp()](./app.initializeapp.md) to create an app. |
|  [FirebaseAppConfig](./app.firebaseappconfig.md) | Configuration options given to [initializeApp()](./app.initializeapp.md) |
|  [FirebaseOptions](./app.firebaseoptions.md) | Firebase configuration object |

## Variables

|  Variable | Description |
|  --- | --- |
|  [SDK\_VERSION](./app.sdk_version.md) | The current SDK version. |