How to measure time taken by a function to execute


var startTime =

doSomething()   // <---- measured code goes between startTime and endTime
var endTime =

console.log(`Call to doSomething took ${endTime - startTime} milliseconds`)

In Node.js it is required to import the performance class

importing performance

const { performance } = require('perf_hooks');

Using console.time: (living standard)

doSomething()   // <---- The function you're measuring time for 

The string being passed to the time() and timeEnd() methods must match
(for the timer to finish as expected).

console.time() documentations:

  • MDN documentation
  • Node.js documentation

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