Azure Functions Documentation

Welcome to the official documentation for Azure Functions, a serverless compute service that enables you to run event-driven code without explicitly provisioning or managing infrastructure. You can build and run applications and services on-demand and at scale.

What are Azure Functions?

Azure Functions allow you to write small pieces of code, called functions, that respond to events. These events can be anything from HTTP requests, timers, messages in a queue, or even changes in a database. Azure handles the underlying infrastructure, scaling your code automatically to meet demand.

Key Concepts

Event-driven: Functions are triggered by specific events.
Serverless: No servers to manage, pay only for execution time.
Scalable: Automatically scales based on workload.
Languages: Supports multiple programming languages including C#, JavaScript, TypeScript, Python, Java, PowerShell, and more.

Getting Started

To get started with Azure Functions, you can follow these steps:

Create a Function App: This is the logical container for your functions.
Choose a Trigger: Select the event that will invoke your function.
Write your Function Code: Implement the logic in your preferred language.
Deploy and Monitor: Publish your functions and track their performance.

Note: Azure Functions integrates seamlessly with other Azure services like Azure Storage, Azure Cosmos DB, and Azure Service Bus.

Common Triggers and Bindings

Azure Functions excel when used with various triggers and bindings. Some common ones include:

HTTP Trigger: For building web APIs and webhooks.
Timer Trigger: For scheduled tasks.
Blob Trigger: To respond to changes in Azure Blob Storage.
Queue Trigger: To process messages from Azure Storage Queues.

Example: HTTP Triggered Function (JavaScript)

                
                    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,
                            body: responseMessage
                        };
                    };
                
            

Tip: Explore the Triggers and Bindings section for a comprehensive list and examples.

Learn More

Dive deeper into specific aspects of Azure Functions: