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PerformanceNavigationTiming: toJSON() method

The toJSON() method of the PerformanceNavigationTiming interface is a serializer; it returns a JSON representation of the PerformanceNavigationTiming object.

Syntax

toJSON()

Parameters

None.

Return value

A JSON object that is the serialization of the PerformanceNavigationTiming object.

Examples

Using the toJSON method

In this example, calling entry.toJSON() returns a JSON representation of the PerformanceNavigationTiming object.

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    console.log(entry.toJSON());
  });
});

observer.observe({ entryTypes: ["navigation"] });

This would log a JSON object like so:

json

{
  "name": "https://en.wikipedia.org/wiki/Main_Page",
  "entryType": "navigation",
  "startTime": 0,
  "duration": 227.60000002384186,
  "initiatorType": "navigation",
  "nextHopProtocol": "h2",
  "renderBlockingStatus": "blocking",
  "workerStart": 0,
  "redirectStart": 4,
  "redirectEnd": 71.40000000596046,
  "fetchStart": 71.40000000596046,
  "domainLookupStart": 71.40000000596046,
  "domainLookupEnd": 71.40000000596046,
  "connectStart": 71.40000000596046,
  "connectEnd": 71.40000000596046,
  "secureConnectionStart": 71.40000000596046,
  "requestStart": 73.7000000178814,
  "responseStart": 102.90000000596046,
  "responseEnd": 105.2000000178814,
  "transferSize": 19464,
  "encodedBodySize": 19164,
  "decodedBodySize": 83352,
  "serverTiming": [
    {
      "name": "cache",
      "duration": 0,
      "description": "hit-front"
    },
    {
      "name": "host",
      "duration": 0,
      "description": "cp3062"
    }
  ],
  "unloadEventStart": 0,
  "unloadEventEnd": 0,
  "domInteractive": 178.10000002384186,
  "domContentLoadedEventStart": 178.2000000178814,
  "domContentLoadedEventEnd": 178.2000000178814,
  "domComplete": 227.60000002384186,
  "loadEventStart": 227.60000002384186,
  "loadEventEnd": 227.60000002384186,
  "type": "navigate",
  "redirectCount": 1,
  "activationStart": 0
}

To get a JSON string, you can use JSON.stringify(entry) directly; it will call toJSON() automatically.

Specifications

Specification
Navigation Timing Level 2 # dom-performancenavigationtiming-tojson

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`toJSON`	57	16	58	No	44	15	57	57	58	43	15.1	7.0