PerformanceElementTiming.toJSON()

The toJSON() method of the PerformanceElementTiming interface is a standard serializer. It returns a JSON representation of the object's properties.

Syntax

var json = PerformanceElementTiming.toJSON();

Return value

json
A JSON object that is the serialization of the PerformanceElementTiming object.

Examples

In this example calling entry.toJSON() returns a JSON representation of the PerformanceElementTiming object, with the information about the image element.

<img src="image.jpg" alt="a nice image" elementtiming="big-image" id="myImage">
const observer = new PerformanceObserver((list) => {
  let entries = list.getEntries().forEach(function (entry) {
    if (entry.identifier === "big-image") {
      console.log(entry.toJSON());
    }
  });
});
observer.observe({ entryTypes: ["element"] });

This example uses the PerformanceObserver interface to create a list of performance measurement events. In our case we observe the PerformanceEntry.entrytype element in order to use the PerformanceElementTiming interface.

Specifications

Specification Status Comment
Unknown
The definition of 'PerformanceElementTiming.toJson()' in that specification.
Unknown Initial definition.

Browser compatibility

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