The toJSON()
method is a serializer; it returns a JSON representation of the PerformanceEntry
object.
The toJSON()
method is a serializer; it returns a JSON representation of the PerformanceEntry
object.
js
toJSON()
None.
A JSON
object that is the serialization of the PerformanceEntry
object.
In this example, calling entry.toJSON()
returns a JSON representation of the PerformanceMark
object.
js
performance.mark("debug-marker", { detail: "debugging-marker-123", }); const observer = new PerformanceObserver((list) => { list.getEntries().forEach((entry) => { console.log(entry.toJSON()); }); }); observer.observe({ entryTypes: ["mark"] });
This would log a JSON object like so:
json
{ "name": "debug-marker", "entryType": "mark", "startTime": 158361, "duration": 0 }
Note that it doesn't contain PerformanceMark
's detail
property.
To get a JSON string, you can use JSON.stringify(entry)
directly; it will call toJSON()
automatically.
Specification |
---|
Performance Timeline # dom-performanceentry-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 |
45 | 16 | 35 | No | 32 | 11 | 45 | 45 | 35 | 32 | 11 | 5.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEntry/toJSON