Customize at the edge with CloudFront Functions

With CloudFront Functions, you can write lightweight functions in JavaScript for high-scale, latency-sensitive CDN customizations. Your functions can manipulate the requests and responses that flow through CloudFront, perform basic authentication and authorization, generate HTTP responses at the edge, and more. The CloudFront Functions runtime environment offers submillisecond startup times, scales immediately to handle millions of requests per second, and is highly secure. CloudFront Functions is a native feature of CloudFront, which means you can build, test, and deploy your code entirely within CloudFront.

When you associate a CloudFront function with a CloudFront distribution, CloudFront intercepts requests and responses at CloudFront edge locations and passes them to your function. You can invoke CloudFront Functions when the following events occur:

For more information about CloudFront Functions, see the following topics: