App settings reference for Azure Functions

App settings in a function app contain global configuration options that affect all functions for that function app. When you run locally, these settings are in environment variables. This article lists the app settings that are available in function apps.

There are other global configuration options in the host.json file and in the local.settings.json file.

APPINSIGHTS_INSTRUMENTATIONKEY

The Application Insights instrumentation key if you're using Application Insights. See Monitor Azure Functions.

Key Sample value
APPINSIGHTS_INSTRUMENTATIONKEY 5dbdd5e9-af77-484b-9032-64f83bb83bb

AzureWebJobsDashboard

Optional storage account connection string for storing logs and displaying them in the Monitor tab in the portal. The storage account must be a general-purpose one that supports blobs, queues, and tables. See Storage account and Storage account requirements.

Key Sample value
AzureWebJobsDashboard DefaultEndpointsProtocol=https;AccountName=[name];AccountKey=[key]

AzureWebJobsDisableHomepage

true means disable the default landing page that is shown for the root URL of a function app. Default is false.

Key Sample value
AzureWebJobsDisableHomepage true

When this app setting is omitted or set to false, a page similar to the following example is displayed in response to the URL <functionappname>.azurewebsites.net.

Function app landing page

AzureWebJobsDotNetReleaseCompilation

true means use Release mode when compiling .NET code; false means use Debug mode. Default is true.

Key Sample value
AzureWebJobsDotNetReleaseCompilation true

AzureWebJobsFeatureFlags

A comma-delimited list of beta features to enable. Beta features enabled by these flags are not production ready, but can be enabled for experimental use before they go live.

Key Sample value
AzureWebJobsFeatureFlags feature1,feature2

AzureWebJobsScriptRoot

The path to the root directory where the host.json file and function folders are located. In a function app, the default is %HOME%\site\wwwroot.

Key Sample value
AzureWebJobsScriptRoot %HOME%\site\wwwroot

AzureWebJobsSecretStorageType

Specifies the repository or provider to use for key storage. Currently, the supported repositories are blob ("Blob") and file system ("disabled"). The default is file system ("disabled").

Key Sample value
AzureWebJobsSecretStorageType disabled

AzureWebJobsStorage

The Azure Functions runtime uses this storage account connection string for all functions except for HTTP triggered functions. The storage account must be a general-purpose one that supports blobs, queues, and tables. See Storage account and Storage account requirements.

Key Sample value
AzureWebJobsStorage DefaultEndpointsProtocol=https;AccountName=[name];AccountKey=[key]

AzureWebJobs_TypeScriptPath

Path to the compiler used for TypeScript. Allows you to override the default if you need to.

Key Sample value
AzureWebJobs_TypeScriptPath %HOME%\typescript

FUNCTION_APP_EDIT_MODE

Valid values are "readwrite" and "readonly".

Key Sample value
FUNCTION_APP_EDIT_MODE readonly

FUNCTIONS_EXTENSION_VERSION

The version of the Azure Functions runtime to use in this function app. A tilde with major version means use the latest version of that major version (for example, "~1"). When new versions for the same major version are available, they are automatically installed in the function app. To pin the app to a specific version, use the full version number (for example, "1.0.12345"). Default is "~1".

Key Sample value
FUNCTIONS_EXTENSION_VERSION ~1

WEBSITE_CONTENTAZUREFILECONNECTIONSTRING

For consumption plans only. Connection string for storage account where the function app code and configuration are stored. See Create a function app.

Key Sample value
WEBSITE_CONTENTAZUREFILECONNECTIONSTRING DefaultEndpointsProtocol=https;AccountName=[name];AccountKey=[key]

WEBSITE_CONTENTSHARE

For consumption plans only. The file path to the function app code and configuration. Used with WEBSITE_CONTENTAZUREFILECONNECTIONSTRING. Default is a unique string that begins with the function app name. See Create a function app.

Key Sample value
WEBSITE_CONTENTSHARE functionapp091999e2

WEBSITE_MAX_DYNAMIC_APPLICATION_SCALE_OUT

The maximum number of instances that the function app can scale out to. Default is no limit.

Note

This setting is for a preview feature.

Key Sample value
WEBSITE_MAX_DYNAMIC_APPLICATION_SCALE_OUT 10

WEBSITE_NODE_DEFAULT_VERSION

Default is "6.5.0".

Key Sample value
WEBSITE_NODE_DEFAULT_VERSION 6.5.0

Next steps

Learn how to update app settings

See global settings in the host.json file

See other app settings for App Service apps