A robust benchmarking library that supports high-resolution timers & returns statistically significant results. As seen on jsPerf.

• API Documentation

• Development source

(Also available at https://gerhobbelt.github.io/benchmark.js/example/jsperf/)

A pretty minimal jsperf.com-alike benchmark websize using Benchmark is available at [example/jsperf].

Note that the web pages shown there do not store your performance data for comparison! The benchmark is run and the results are shown, but the results are not persisted for comparison with other browsers.

Benchmark.js’ only hard dependency is lodash. Include platform.js to populate Benchmark.platform.

In a browser:

<script src="lodash.js"></script>
<script src="platform.js"></script>
<script src="benchmark.js"></script>

In an AMD loader:

require({
  'paths': {
    'benchmark': 'path/to/benchmark',
    'lodash': 'path/to/lodash',
    'platform': 'path/to/platform'
  }
},
['benchmark'], function(Benchmark) {/*…*/});

Using npm:

$ npm i --save benchmark

In Node.js:

var Benchmark = require('benchmark');

Optionally, use the microtime module by Wade Simmons:

npm i --save microtime

Usage example:

var suite = new Benchmark.Suite;

// add tests
suite.add('RegExp#test', function() {
  /o/.test('Hello World!');
})
.add('String#indexOf', function() {
  'Hello World!'.indexOf('o') > -1;
})
// add listeners
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').map('name'));
})
// run async
.run({ 'async': true });

// logs:
// => RegExp#test x 4,161,532 +-0.99% (59 cycles)
// => String#indexOf x 6,139,623 +-1.00% (131 cycles)
// => Fastest is String#indexOf

The following npm tasks are available to assist during development and release:

• npm run server will start live-server and open the base directory in your browser; then you can, for example, browse to /example/jsperf/ to run the available tests in your browser using the local benchmark.js file.

• npm run test -- nuff said.

• npm run doc -- will regenerate the documentation from source.

Also note that rough support for a test catalog is available for the /example/jsperf/ demo: run ./build-jsperf.sh to update the catalog file and then the next reload of the /example/jsperf/index.html page will show a clickable list of all available tests near the bottom so you can browse and jump from one test file/suite to another.

Tested in Chrome 54-55, Firefox 49-50, IE 11, Edge 14, Safari 9-10, Node.js 6-7, & PhantomJS 2.1.1.

Benchmark.js is part of the @BestieJS “Best in Class” module collection. This means we promote solid browser/environment support, ES5+ precedents, unit testing, & plenty of documentation.