Normalize query string parameters in a CloudFront Functions viewer request - Amazon CloudFront

Normalize query string parameters in a CloudFront Functions viewer request

The following code example shows how to normalize query string parameters in a CloudFront Functions viewer request.

JavaScript
JavaScript runtime 2.0 for CloudFront Functions
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the CloudFront Functions examples repository. 

function handler(event) {
     var qs=[];
     for (var key in event.request.querystring) {
         if (event.request.querystring[key].multiValue) {
             event.request.querystring[key].multiValue.forEach((mv) => {qs.push(key + "=" + mv.value)});
         } else {
             qs.push(key + "=" + event.request.querystring[key].value);
         }
     };
     
     event.request.querystring = qs.sort().join('&');
     
      
     return event.request;
}

For a complete list of AWS SDK developer guides and code examples, see Using CloudFront with an AWS SDK. This topic also includes information about getting started and details about previous SDK versions.