Microsoft Docs

Open VS Code and install the extension:

In VS Code, open the Extensions view (Ctrl+Shift+X or Cmd+Shift+X) and search for "Azure Functions". Click "Install" on the extension published by Microsoft.

After installation, you'll see the Azure icon in the Activity Bar. Click it to access the Azure Functions explorer.

Initialize a new Azure Functions project:

1. In the Azure Functions explorer, click the "Create New Project..." button.
2. Select a folder for your project.
3. Choose a language for your project. For this guide, select JavaScript or TypeScript.
4. Select the template for your first function. Choose HTTP trigger.
5. Provide a name for your function (e.g., HttpExample).
6. Choose an authorization level. For development, select Anonymous.

VS Code will create a new folder with the project files, including host.json, local.settings.json, and your function's folder (e.g., HttpExample/index.js).

Open and edit the function code:

Navigate to the HttpExample/index.js (or index.ts) file. You'll see boilerplate code that handles an HTTP request.

Here's an example of a simple HTTP-triggered function:

module.exports = async function (context, req) {
    context.log('JavaScript HTTP trigger function processed a request.');

    const name = (req.query.name || (req.body && req.body.name));
    const responseMessage = name
        ? 'Hello, ' + name + '!'
        : 'This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response.';

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

This function retrieves a name from the query string or request body and returns a personalized greeting.

Start the Functions host:

Press F5 to start the Azure Functions host. VS Code will build and run your project locally.

Once the host is running, you'll see output in the Terminal window, including the URL for your HTTP-triggered function. It typically looks like this:

You can test this endpoint by opening your browser and navigating to the URL, adding a query parameter like ?name=Azure, or by sending a POST request with a JSON body.

Example URL: http://localhost:7071/api/HttpExample?name=World

Deploy your function to Azure:

In the Azure Functions explorer, click the "Deploy to Function App..." button.

Follow the prompts to select your Azure subscription, create a new Function App (or select an existing one), and deploy your code.

Once deployed, you'll get a new URL for your function in Azure, which you can use to access it from anywhere.