PerformanceResourceTiming.encodedBodySize

The encodedBodySize read-only property represents the size (in octets) received from the fetch (HTTP or cache), of the payload body, before removing any applied content-codings.

Note: This feature is available in Web Workers

If the resource is retrieved from an application cache or a local resource, it must return the size of the payload body before removing any applied content-codings.

Syntax

resource.encodedBodySize;

Return value

A number representing the size (in octets) received from the fetch (HTTP or cache), of the payload body, before removing any applied content-codings.

Example

The following example, the value of the size properties of all "resource" type events are logged. 

function log_sizes(perfEntry){
  // Check for support of the PerformanceEntry.*size properties and print their values
  // if supported.
  if ("decodedBodySize" in perfEntry)
    console.log("decodedBodySize = " + perfEntry.decodedBodySize);
  else
    console.log("decodedBodySize = NOT supported");

  if ("encodedBodySize" in perfEntry)
    console.log("encodedBodySize = " + perfEntry.encodedBodySize);
  else
    console.log("encodedBodySize = NOT supported");

  if ("transferSize" in perfEntry)
    console.log("transferSize = " + perfEntry.transferSize);
  else
    console.log("transferSize = NOT supported");
}
function check_PerformanceEntries() {
  // Use getEntriesByType() to just get the "resource" events
  var p = performance.getEntriesByType("resource");
  for (var i=0; i < p.length; i++) {
    log_sizes(p[i]);
  }
}

Specifications

Specification
Resource Timing Level 2 (Resource Timing 2)
# dom-performanceresourcetiming-encodedbodysize

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
encodedBodySize
54
17
45
No
41
No
54
54
45
41
No
6.0

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https://developer.mozilla.org/en-US/docs/Web/API/PerformanceResourceTiming/encodedBodySize