Introduction: Azure Functions is a serverless compute service that enables you to run event-triggered code without explicitly provisioning or managing infrastructure. In this tutorial, we'll explore how to create and deploy Azure Functions using Node.js.

Prerequisites:

• Azure account (create one if you don't have it)
• Node.js installed
• Azure Functions Core Tools (npm install -g azure-functions-core-tools)

Create an Azure Functions Project:

Open a terminal and run:

func init MyFunctionApp --language javascript
cd MyFunctionApp

Create a new function:

func new --name MyFunction --template "HTTP trigger"

Install dependencies:

Write your Function:
Open MyFunction/index.js and replace the existing code with a simple example:

const name = (req.query.name || (req.body && req.body.name));
const responseMessage = name
    ? `Hello, ${name}. This HTTP triggered function executed successfully.`
    : "Please pass a name on the query string or in the request body.";

context.res = {
    // status: 200, /* Defaults to 200 */
    body: responseMessage,
};

Run and Test Locally:
Execute the following command to run your function locally:
func start

Visit http://localhost:7071/api/MyFunction?name=John in your browser or use a tool like curl to test.

Deploy to Azure:

1. Create a new function app in the Azure Portal.
2. Update MyFunctionApp/local.settings.json with your Azure Functions app settings.
3. Deploy your function

func azure functionapp publish MyFunctionApp