PerformanceEventTiming: toJSON() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The toJSON() method of the PerformanceEventTiming interface is a serializer; it returns a JSON representation of the PerformanceEventTiming object.
Syntax
js
toJSON() Parameters
None.
Return value
A JSON object that is the serialization of the PerformanceEventTiming object.
The JSON doesn't contain the target property because it is of type Node, which doesn't provide a toJSON() operation.
Examples
Using the toJSON method
In this example, calling entry.toJSON() returns a JSON representation of the PerformanceEventTiming object.
js
const observer = new PerformanceObserver((list) => { list.getEntries().forEach((entry) => { console.log(entry.toJSON()); }); }); observer.observe({ type: "event", buffered: true }); This would log a JSON object like so:
json
{ "name": "dragover", "entryType": "event", "startTime": 67090751.599999905, "duration": 128, "processingStart": 67090751.70000005, "processingEnd": 67090751.900000095, "cancelable": true } To get a JSON string, you can use JSON.stringify(entry) directly; it will call toJSON() automatically.
Specifications
| Specification |
|---|
| Event Timing API # dom-performanceeventtiming-tojson |