Azure Functions is a compute service that allows you to run code on-demand without having to manage infrastructure, making it ideal for processing data, integrating systems, and building simple APIs. It supports a variety of languages such as C#, Java, JavaScript\/Node.js, Python, and PowerShell.<\/p>\n
In this tutorial, we’ll walk you through the process of building and deploying an Azure Function, using Visual Studio Code as the development environment.<\/p>\n
Before we begin, make sure you have the following:<\/p>\n
To create a new Azure Functions project in VS Code, follow these steps:<\/p>\n
Open the Terminal panel in VS Code by navigating to “Terminal” > “New Terminal”.<\/p>\n<\/li>\n
In the terminal, navigate to the folder you just created by typing the following command:<\/p>\n
cd MyFirstFunction\n<\/code><\/pre>\n<\/li>\n- Create a new Azure Functions project by running the following command:\n
func init\n<\/code><\/pre>\nThis command will prompt you to choose a runtime and a development language. Select your preferred options and press Enter.<\/p>\n<\/li>\n
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After the initialization is complete, you’ll see a new folder called “MyFirstFunction” in your project folder. This folder contains a basic project structure with a host.json<\/code> file, a local.settings.json<\/code> file, and a folder for your functions.<\/p>\n<\/li>\n- \n
To create a new function, navigate to the “MyFirstFunction” folder in the Terminal panel and type the following command:<\/p>\n
func new\n<\/code><\/pre>\nThis will prompt you to select a function template. Choose your preferred language and function type, then press Enter.<\/p>\n
We’ll choose the “HttpTrigger” template for this tutorial.<\/p>\n<\/li>\n
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Next, you’ll be prompted to enter a name for your function. Enter a name (e.g. “MyFirstFunction”) and press Enter.<\/p>\n<\/li>\n
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You’ll now see a new file in your “MyFirstFunction” folder called MyFirstFunction\/index.js<\/code>. This is your function code file.<\/p>\n<\/li>\n<\/ol>\nTesting your Function Locally<\/h2>\n
Now that your function is created, you can test it locally before deploying it to Azure.<\/p>\n
\n- In the Terminal panel, navigate to your “MyFirstFunction” folder and run the following command to start the local Azure Functions runtime:\n
func start\n<\/code><\/pre>\nYou’ll see output in the terminal indicating that the runtime has started.<\/p>\n<\/li>\n
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Open your web browser and navigate to http:\/\/localhost:7071\/api\/MyFirstFunction`, replacing<\/code>MyFirstFunction` with the name of your function.<\/p>\nYou should see a message in your browser that says “Please pass a name on the query string or in the request body”.<\/p>\n
Let’s modify your function to return a personalized message based on the query string or request body.<\/p>\n<\/li>\n
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Open MyFirstFunction\/index.js<\/code> and replace the contents of the file with the following code:<\/p>\nmodule.exports = async function (context, req) {\n context.log('JavaScript HTTP trigger function processed a request.');\n\n const name = (req.query.name || (req.body && req.body.name));\n const responseMessage = name\n ? \"Hello, \" + name + \". This HTTP triggered function executed successfully.\"\n : \"This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response.\";\n\n context.res = {\n \/\/ status: 200, \/* Defaults to 200 *\/\n body: responseMessage\n };\n}\n<\/code><\/pre>\nThis code checks for a name<\/code> parameter in the query string or request body, and returns a personalized message if it’s present.<\/p>\n<\/li>\n- \n
Save your changes to index.js<\/code>, and refresh your browser to test the updated function.<\/p>\nTry adding ?name=yourname<\/code> to the end of the URL to see the personalized message. You should see a message that says “Hello, yourname. This HTTP triggered function executed successfully.”<\/p>\nThis confirms that your function is working as expected.<\/p>\n<\/li>\n<\/ol>\n
Deploying your Function to Azure<\/h2>\n
Now that your function is tested locally, you’re ready to deploy it to Azure.<\/p>\n
\n- First, you’ll need to create a new Function App in Azure. Navigate to the Azure portal and click “Create a Resource” > “Compute” > “Function App”.\n
Fill out the necessary information (subscription, resource group, etc.), and click “Review + Create” to create your Function App.<\/p>\n<\/li>\n
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Once your Function App is created, open it in the Azure portal. Click on “Deployment Center” in the left-hand menu, and choose “Local Git” as the deployment method.<\/p>\n
This will create a new Git repository for your Azure Function.<\/p>\n<\/li>\n
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In VS Code, open the Terminal panel and navigate to the root of your project folder.<\/p>\n
Initialize a new Git repository by running the following command:<\/p>\n
git init\n<\/code><\/pre>\nThis will create a new Git repository in your project folder.<\/p>\n<\/li>\n
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Next, add the Azure Functions Git repository as a remote by running the following command:<\/p>\n
git remote add azure <git-url-from-azure-portal>\n<\/code><\/pre>\nReplace <git-url-from-azure-portal><\/code> with the Git clone URL from the Azure portal.<\/p>\n<\/li>\n- \n
To deploy your function to Azure, commit your changes to your local Git repository by running the following commands:<\/p>\n
git add .\ngit commit -m \"Initial commit\"\n<\/code><\/pre>\n<\/li>\n- Finally, push your changes to the Azure remote by running the following command:\n
git push azure master\n<\/code><\/pre>\nThis will push your local changes to the Azure Git repository and trigger a deployment of your function to Azure.<\/p>\n
You can monitor the deployment status in the Azure portal by navigating to your Function App and clicking “Deployment Center” > “Deployment Details”.<\/p>\n
Once the deployment is complete, you can test your function in Azure by navigating to your Function App and clicking “Functions” > “MyFirstFunction” (or whatever name you chose for your function).<\/p>\n
You’ll see a test page where you can enter a name and test your function.<\/p>\n<\/li>\n<\/ol>\n
Congratulations! You’ve successfully created and deployed an Azure Function using Visual Studio Code.<\/p>\n
Conclusion<\/h2>\n
In this tutorial, we walked through the process of creating a new Azure Functions project in VS Code, testing a function locally, and deploying the function to Azure.<\/p>\n
Azure Functions simplifies the process of building and deploying code that runs on-demand, making it ideal for a variety of use cases.<\/p>\n
With the Azure Functions extension for VS Code, you can streamline your development and deployment process, allowing you to focus on building the functionality of your function.<\/p>\n
To learn more about Azure Functions, check out the official documentation at docs.microsoft.com\/azure\/azure-functions<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"