The toJSON()
method of the PerformanceEventTiming
interface is a serializer; it returns a JSON representation of the PerformanceEventTiming
object.
The toJSON()
method of the PerformanceEventTiming
interface is a serializer; it returns a JSON representation of the PerformanceEventTiming
object.
js
toJSON()
None.
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.
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.
Specification |
---|
Event Timing API # dom-performanceeventtiming-tojson |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
toJSON |
76 | 79 | 89 | No | 63 | No | 76 | 76 | 89 | 54 | No | 12.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEventTiming/toJSON