The toJSON()
method of the Performance
interface is a serializer; it returns a JSON representation of the Performance
object.
The toJSON()
method of the Performance
interface is a serializer; it returns a JSON representation of the Performance
object.
js
toJSON()
None.
A JSON
object that is the serialization of the Performance
object.
The returned JSON doesn't contain the eventCounts
property because it is of type EventCounts
, which doesn't provide a toJSON()
operation.
Note: The JSON object contains the serialization of the deprecated performance.timing
and performance.navigation
properties. To get a JSON representation of the newer PerformanceNavigationTiming
interface, call PerformanceNavigationTiming.toJSON()
instead.
In this example, calling performance.toJSON()
returns a JSON representation of the Performance
object.
js
performance.toJSON();
This would log a JSON object like so:
json
{ "timeOrigin": 1668077531367.4, "timing": { "connectStart": 1668077531372, "navigationStart": 1668077531367, "secureConnectionStart": 0, "fetchStart": 1668077531372, "domContentLoadedEventStart": 1668077531580, "responseStart": 1668077531372, "domInteractive": 1668077531524, "domainLookupEnd": 1668077531372, "responseEnd": 1668077531500, "redirectStart": 0, "requestStart": 1668077531372, "unloadEventEnd": 0, "unloadEventStart": 0, "domLoading": 1668077531512, "domComplete": 1668077531585, "domainLookupStart": 1668077531372, "loadEventStart": 1668077531585, "domContentLoadedEventEnd": 1668077531580, "loadEventEnd": 1668077531585, "redirectEnd": 0, "connectEnd": 1668077531372 }, "navigation": { "type": 0, "redirectCount": 0 } }
To get a JSON string, you can use JSON.stringify(performance)
directly; it will call toJSON()
automatically.
Specification |
---|
High Resolution Time # dom-performance-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 |
56 | 12 | 25 | 9 | No | 14.1 | 56 | 56 | 25 | No | 14.5 | 6.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Performance/toJSON