In this example, calling entry.toJSON() returns a JSON representation of the first PerformanceScriptTiming object available in an observed long animation frame.
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
console.log(entry.scripts[0].toJSON());
});
});
observer.observe({ type: "long-animation-frame", buffered: true });
This would log a JSON object like so:
{
"duration": 45,
"entryType": "script",
"executionStart": 11803.199999999255,
"forcedStyleAndLayoutDuration": 0,
"invoker": "DOMWindow.onclick",
"invokerType": "event-listener",
"name": "script",
"pauseDuration": 0,
"sourceURL": "https://web.dev/js/index-ffde4443.js",
"sourceFunctionName": "myClickHandler",
"sourceCharPosition": 17796,
"startTime": 11803.199999999255,
"window": [Window object],
"windowAttribution": "self"
}
To get a JSON string, you can use JSON.stringify(entry) directly; it will call toJSON() automatically.
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