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 |
Browser compatibility
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