SpeedTest

A JavaScript library to measure various aspects of a connection. It can accurately estimate a bandwidth/latency between a client (using a web browser) and a server (running a specific script).

Compatibility

SpeedTest is based on two browser features: Resource Timing and XMLHttpRequest (v2). While the first one can be polyfilled, the second one is a requirement.

Thus, SpeedTest should be compatible with:

Browser	Partial support (polyfill)	Native support
IE 10+		✔
Firefox 35+		✔
Chrome 29+		✔
Opera 15+		✔
Android Browser 4.4+		✔
Safari 5+	✔
iOS Safari 5.1+	✔
Firefox 12+	✔
Opera 12.1+	✔
Android Browser 3+	✔

Latency measures can be very far from reality if the browser doesn't have native support and uses the provided polyfill.

Caveats

• Latency measures never return any results with Firefox.
• Chrome cannot upload a ~128 MB file, which will mainly affect fiber users.
• Currently, the client and the server must be on the same domain or measures can't be done due to the same-origin policy.

How to use

// Create a new SpeedTest instance by providing an optional object.
// N.B. The following options are the default ones.
var speed = new SpeedTest({
    endpoint: './speedtest.php', // Where is located your `speedtest.php` file.
    delay: 8000, // The delay while you want to take measures for a bandwidth measure.

    // Defines the amount of data to initially use for each bandwidth module.
    dataSize: {
        upload: 2 * 1024 * 1024, // 2 MB
        download: 10 * 1024 * 1024, // 10 MB

        // If the measure period can't reach the delay defined in the options, the
        // data amount is increased by the multiplier value.
        multiplier: 2
    },

    // Defines how many measures should be returned by the latency module and
    // how much attempts to get a valid value should be done for each measure.
    latency: {
        measures: 5,
        attempts: 3
    }
});

// Listen for the "end" event which provides the calculated latencies.
speed.latency.on('end', function(averageLatency, allLatencies) {
    // "allLatencies" is an array containing the five calculated latencies in
    // milliseconds. They're used to determine an average latency.
    console.log('end', averageLatency, allLatencies);
});

// Once all the configuration is done, start the requests for this module.
speed.latency.start();

// It is possible to chain functions for all the modules, here's an example with the
// upload module.
speed.upload
     .on('start', function(dataSize) {
         console.log('start', dataSize);
     })
     .on('progress', function(averageSpeed, instantSpeed) {
         // Every bandwidth measure are in Mega BYTES per second!
         console.log('progress', averageSpeed, instantSpeed);
     })
     .on('restart', function(dataSize) {
         // The restart event is triggered when the module didn't have time
         // (according to the `delay` option) to take all the measures. A new
         // request will start with data size increased by the multiplier value.
         console.log('restart', dataSize);
     })
     .on('end', function(averageSpeed, allInstantSpeeds) {
         console.log('end', averageSpeed, allInstantSpeeds);
     })
     .start();

// You can also cancel a request (except for the "latency" module).
speed.upload.abort();

speed.download
     .on('start', function(dataSize) {
         console.log('start', dataSize);
     })
     .on('progress', function(averageSpeed, instantSpeed) {
         console.log('progress', averageSpeed, instantSpeed);
     })
     .on('restart', function(dataSize) {
         console.log('restart', dataSize);
     })
     .on('end', function(averageSpeed, allInstantSpeeds) {
         console.log('end', averageSpeed, allInstantSpeeds);
     })
     .start();

speed.download.abort();

Compilation

To compile the project, install the latest version of Node and run these commands inside a terminal:

git clone https://github.com/Nesk/SpeedTest.git
cd SpeedTest
npm install
npm run build

There's also a watch script which compiles the project whenever a file is changed:

npm run watch

To check if the project passes all the tests, run:

npm test

Contribution

Read the CONTRIBUTING file.

License

This project is licensed under the MIT license, check TLDRLegal for details.