Get Started with Azure Functions

Initialize Your Project

Open your terminal or command prompt and navigate to the directory where you want to create your project. Then, run the following command to create a new Functions project:

func init MyFunctionProject --worker-runtime 

Replace <runtime> with your chosen language runtime (e.g., dotnet, node, python, java). For example, to create a Node.js project:

func init MyFunctionProject --worker-runtime node

Create a New Function

Navigate into your project directory and create a new function. You'll be prompted to choose a template (e.g., HTTP trigger, Timer trigger).

cd MyFunctionProject
func new --name HttpTriggerFunction --template "HTTP trigger" --authlevel "anonymous"

This command creates a new HTTP-triggered function named HttpTriggerFunction with anonymous authentication.

Develop Your Function Code

Open the generated function folder in your IDE. You'll find files like index.js (or __init__.py, HttpTrigger.cs depending on your runtime) and function.json.

Example (Node.js):

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.'
        : '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,
        body: responseMessage
    };
};

The function.json file defines the function's bindings, specifying how it's triggered and what inputs/outputs it has.

Run Locally

From your project's root directory, start the Azure Functions runtime:

func start

The output will show the URL for your HTTP-triggered function. You can then access it using a web browser or tools like curl.

Deploy to Azure

Once you're satisfied with your function, you can deploy it to Azure. You'll need an Azure account and the Azure CLI installed and logged in.

1. Create an Azure Functions App: You can do this via the Azure portal or the Azure CLI.
2. Deploy: Use the following command from your project's root directory:

func azure functionapp publish 

Replace <YourFunctionAppName> with the name of the Functions App you created in Azure.