In this example, calling entry.toJSON() returns a JSON representation of the PerformanceMark object.
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:
{
"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.
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