PerformanceTimingConfidence: toJSON() method
The toJSON() method of the PerformanceTimingConfidence interface is a serializer that returns a JSON representation of the PerformanceTimingConfidence object.
Syntax
js
toJSON()
Parameters
None.
Return value
A JSON object that is the serialization of the PerformanceTimingConfidence object.
Examples
Using the toJSON method
This example uses a PerformanceObserver to retrieve a JSON serialization of the confidence data for observed PerformanceNavigationTiming entries.
js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
console.log(entry.confidence.toJSON());
});
});
observer.observe({ type: "navigation", buffered: true });
This would log a JSON object like so:
json
{
"randomizedTriggerRate": 0.4994798,
"value": "high"
}
To get a JSON string, you can use JSON.stringify(entry) directly; it will call toJSON() automatically.
Specifications
| Specification |
|---|
| Navigation Timing Level 2 # dom-performancetimingconfidence-tojson |