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Performance: clearMeasures() method

The clearMeasures() method removes all or specific PerformanceMeasure objects from the browser's performance timeline.

Syntax

js

clearMeasures()
clearMeasures(name)

Parameters

name Optional

A string representing the name of the PerformanceMeasure object. If this argument is omitted, all entries with an entryType of "measure" will be removed.

Return value

None (undefined).

Examples

Removing measures

To clean up all performance measure, or just specific entries, use the clearMeasures() method like this:

js

// Create a bunch of measures
performance.measure("from navigation");
performance.mark("a");
performance.measure("from mark a", "a");
performance.measure("from navigation");
performance.measure("from mark a", "a");
performance.mark("b");
performance.measure("between a and b", "a", "b");

performance.getEntriesByType("measure").length; // 5

// Delete just the "from navigation" measure entries
performance.clearMeasures("from navigation");
performance.getEntriesByType("measure").length; // 3

// Delete all of the measure entries
performance.clearMeasures();
performance.getEntriesByType("measure").length; // 0

Specifications

Specification
User Timing
# dom-performance-clearmeasures

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
clearMeasures 2925–29 12 38 10 33 11 4.4 2925–29 42 33 11 2.01.5–2.0

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearMeasures