Azure Functions CLI

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Testing functions with Azure Functions Core Tools

Azure Functions Core Tools provides a local development environment to create and test azure functions. This example shows how to create and locally run a generic HTTP function trigger. Installation and use of Azure Functions Command Line Tools requires Node.js.

After Node.js is installed, install the command line tools with the following command:

npm install -g azure-functions-core-tools@latest

After installation, use the following commands to create a directory that contains a new function project, and a new generic HTTP triggered function within that project:

mkdir myFunctions
cd myFunctions
func init
func new --language c# --template HttpTrigger --name myHttpTrigger

Function myHttpTrigger is now ready to be tested. Enter the following command to start the Function Host:

func host start

Once the host has started, open a browser and navigate to http://localhost:7071/api/myHttpTrigger?name=Azure.

Takeaways

  • Azure Functions Core Tools provide a local development environment for developing, testing, and publishing functions from the command line.
  • Use of the command line tool requires installation of Node.js

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Publishing a function locally

Azure Functions Core Tools provides a local development environment to publish Azure functions. Installation and use of Azure Functions Command-Line Tools requires Node.js. This example shows how to create and publish a function. This requires an existing function app in Azure.

After Node.js is installed, install the command-line tools with the following command:

npm install -g azure-functions-core-tools@latest

After installation, use the following commands to create a directory that contains a new function project, and adds a new generic HTTP function trigger:

mkdir myFunctions
cd myFunctions
func init
func new --language c# --template HttpTrigger --name myHttpTrigger

To publish this function, signing in to Azure is required and can be done through the command line by using the command func azure login. This shows a sign-in prompt for Azure. Enter your credentials and press the "Sign In" button. Upon successful sign-in, the command line displays a list of all subscriptions linked to the account.

The function must be published to a function app that currently exists in Azure. Once you've identified the app you'd like to publish to, enter the following publish command:

func azure functionapp publish myAzureFunctionApp

The published function is visible in the Azure portal and ready for use. Use the command func azure functionapp list to list function apps associated with the current subscription of the authenticated Azure account.

Takeaways

  • Azure Functions Core Tools provide a local development environment for developing, testing, and publishing functions from the command line.
  • Use of the command-line tool requires installation of Node.js
  • Publishing functions from the command line requires sign in to an Azure account, and an existing function app in Azure.

Read more