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Checking for internet speed using Javascript

Check Internet speed using JavaScript to render elements conditionally

The downlink read-only property of the Network
Image descriptionInformation interface returns the effective bandwidth estimate in megabits per second, rounded to the nearest multiple of 25 kilobits per seconds. This value is based on recently observed application layer throughput across recently active connections, excluding connections made to a private address space.

if (navigator.connection.downlink < 5){
   //logic for bad internet speeds
} else {
      //logic for good internet speeds


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Discussion (3)

dennistobar profile image
Dennis Tobar

mmmm... around 65% of usage: and in Firefox you need authorize the feature
Good idea, but it need to be checked before to use :)

(see )

sojinsamuel profile image
Sojin Samuel


talenttinaapi profile image
talent Author

The things Javascript can do are pretty amazing!!