Azure Functions
Execute event-driven serverless code with an end-to-end development experience
Accelerate and simplify serverless application development
Automated and flexible scaling
Keep your focus on adding value instead of managing infrastructure.
Integrated programming model
Respond to events and seamlessly connect to other services.
End-to-end development experience
Build, debug, deploy, and monitor with integrated tools and built-in DevOps capabilities.
Variety of programming languages and hosting options
Choose what's right for each scenario and quickly adjust to meet business needs.
Improve your end-to-end development experience
Get a complete serverless application development experience—from building and debugging locally to deploying and monitoring in the cloud. Use Functions extensions on Visual Studio and Visual Studio Code for a faster and more efficient development on your local machine, fully integrated with the whole Azure platform. Set up continuous integration and continuous delivery (CI/CD) with Azure Pipelines and get intelligent and proactive insights about the performance of serverless applications in production from Azure Monitor.
Simplify complex orchestration challenges resolution
Serverless functions are meant to be short-lived and stateless—until you need them to solve stateful problems. Remove this limitation using a fully managed service, without provisioning more resources, just by coding your workflow definition. Simplify complex, stateful coordination requirements programmatically in event-driven applications with the Durable Functions extension. Also, use your functions on declarative workflows that work with more than 250 connectors in Azure Logic Apps.
Learn more about Durable Functions
Connect other services without hard-coding integrations for faster solutions development
Write only the code that truly matters to your business. Save coding time with a programming model based on triggers and bindings that enable your serverless applications to respond to events and connect to other services seamlessly. Build more scalable and stable event-driven applications with a microservices-friendly approach using Functions.
Learn how to save time with triggers and bindings
Build once, deploy anywhere
Not all applications are the same, and one hosting plan won't fit them all. Pick the Functions plan that matches your business needs and deploy the same code to multiple targets—from pay-per-execution in the cloud to your Kubernetes cluster or IoT devices for edge computing.
Develop your way
Start coding right away with the technology stack you already know and love, with no new languages or frameworks to learn. Pick the programming languages you like best for each unique scenario—from web apps and APIs with .NET, Node.js or Java, to machine learning workflows with Python or cloud automation with PowerShell.
See supported languagesCreate reliable serverless applications with built-in security and monitoring
- Monitor and analyze code performance with Azure Application Insights. Spot bottlenecks and failure hotspots across all components of your application using application maps with distributed tracing from Azure Monitor.
- Source application settings with full control over access policies and audit history—without making code changes—using Azure Key Vault.
- Isolate networks through virtual network connectivity on the Functions Premium plan, enabling outbound traffic into a secured virtual network gating incoming traffic and defining app restrictions.
- Configure managed identities at the service level to let applications easily access other resources protected by Azure Active Directory.
- Grant access to your application using built-in authentication with Azure Active Directory, Microsoft account, and external providers such as Twitter, Facebook, and Google.
Choose the hosting plan that fits your business needs
Consumption plan
Scale automatically and only pay for compute resources when your functions are running. On the Consumption plan, instances of the Functions host are dynamically added and removed based on the number of incoming events.
Premium plan
While automatically scaling based on demand, use pre-warmed workers to run applications with no delay after being idle, run on more powerful instances, and connect to VNETs.
Azure App Service plan
Run Functions within an App Service plan at regular App Service plan rates. Good fit for long running operations, as well as when more predictive scaling and costs are required.
Developer documentation, sample code, and app development resources
Five-minute quickstarts
Build your first function on Windows or Linux using:Developer resources
Azure Serverless Computing Cookbook
Build and monitor event-driven applications with this step-by-step guideLearning modules
Community and Azure Support
Follow Azure Functions on Twitter. Ask questions and get support from Microsoft engineers and Azure community experts on Stack Overflow. Find samples and repositories on GitHub.
Build these solutions with Functions
Serverless APIs with Node.js or Microsoft .NET
Serverless web application for static websites and single-page applications
Serverless microservices for event-driven scenarios
Machine learning workflows with a serverless architecture
Serverless data processing pipelines for files and real-time data
Serverless cloud automation and hybrid resources management
Serverless rapid application development for line of business apps
Start building serverless applications with Functions in three steps
Get 1 million requests for free per month by signing up for an Azure free account.
Create your first serverless function on .NET, JavaScript, Java or Python with a 5-minute quickstart guide.
Find inspiration and explore detailed Functions concepts in the documentation, code samples gallery, and pre-built components library.
See what customers are doing with Azure Functions
Increase development velocity
Zeiss chose Functions because of its simple programming model with declarative bindings, which allowed them to write fewer lines of code.
Improve processing times for complex business problems
FUJIFILM Software reduced processing time and enabled same-day tagging for an average of 3,000 photos per baseball game using Azure Durable Functions.
Achieve scale with no infrastructure management
PWC used Functions to create scalable API for its regulatory obligation knowledge mining solution.
Reduce service integration time
Hotailors can integrate three times as many new suppliers in the same amount of time using Functions.
Azure Functions updates, blogs, and announcements
Frequently asked questions about Functions
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Functions provides varying levels of support for languages including C#, JavaScript, F#, Java, and Python.
See all supported languages -
Functions apps on Consumption plans and App Service plans will run or be available 99.95 percent of the time.
See the full SLA for Functions -
Functions can run in different modes: Consumption plan, Azure App Service plan, and Premium plan.
Compare hosting and scaling on different plans -
Avoid hard-coding access to other services like Azure Blog storage and Azure Cosmos DB using triggers and bindings. Triggers are what cause a function to run, and bindings are declarations that connect the function to another resource.
See all triggers and bindings Functions supports -
Create and test functions on your local machine using favorite code editor and development tools. Connect local functions to live Azure services and debug them on your local computer using the full Functions runtime. The requirements for developing functions on your local computer depend on the programming languages and tools you prefer.
See local development environments