Performance: getEntriesByType() method

{{APIRef("Performance API")}} {{AvailableInWorkers}} 

The getEntriesByType() method returns an array of {{domxref("PerformanceEntry")}}  objects currently present in the performance timeline for a given type.

If you are interested in performance entries of certain name, see {{domxref("Performance.getEntriesByName", "getEntriesByName()")}} . For all performance entries, see {{domxref("Performance.getEntries", "getEntries()")}} .

[!NOTE] This method does not notify you about new performance entries; you will only get entries that are present in the performance timeline at the time you call this method. To receive notifications about entries as they become available, use a {{domxref("PerformanceObserver")}} .

The following entry types are not supported by this method at all and won’t be returned even if entries for these types might exist:

• "element" ({{domxref("PerformanceElementTiming")}} )
• "event" ({{domxref("PerformanceEventTiming")}} )
• "largest-contentful-paint" ({{domxref("LargestContentfulPaint")}} )
• "layout-shift" ({{domxref("LayoutShift")}} )
• "longtask" ({{domxref("PerformanceLongTaskTiming")}} )

To access entries of these types, you must use a {{domxref("PerformanceObserver")}}  instead.

Syntax

getEntriesByType(type)

Parameters

• type
  • : The type of entry to retrieve such as "mark". The valid entry types are listed in {{domxref("PerformanceEntry.entryType")}} . The supported entryTypes can be retrieved using the static property {{domxref("PerformanceObserver.supportedEntryTypes_static", "PerformanceObserver.supportedEntryTypes")}} .

Return value

An {{jsxref("Array")}}  of {{domxref("PerformanceEntry")}}  objects that have the specified type. The items will be in chronological order based on the entries’ {{domxref("PerformanceEntry.startTime","startTime")}} . If no objects have the specified type, or no argument is provided, an empty array is returned.

Examples

Logging resource entries

The following example logs all entries with the type "resource".

const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
  console.log(`${entry.name}'s startTime: ${entry.startTime}`);
});

Specifications

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• {{domxref("Performance.getEntries()")}} 
• {{domxref("Performance.getEntriesByName()")}} 
• {{domxref("PerformanceObserver.supportedEntryTypes_static", "PerformanceObserver.supportedEntryTypes")}}