This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The Network Information API provides information about the system's connection in terms of general connection type (e.g., 'wifi', 'cellular', etc.). This can be used to select high definition content or low definition content based on the user's connection. The entire API consists of the addition of the NetworkInformation interface and a single property to the Navigator interface: Navigator.connection.

Note: This feature is available in Web Workers.

Examples

Detect connection changes

This example watches for changes to the user's connection.

var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
var type = connection.type;

function updateConnectionStatus() {
  console.log("Connection type changed from " + type + " to " + connection.type);
}

connection.addEventListener('change', updateConnectionStatus);

Preload large resources

The connection object is useful for deciding whether to preload resources that take large amounts of bandwidth or memory. This example would be called soon after page load to check for a connection type where preloading a video may not be desirable. If a cellular connection is found, then the preloadVideo flag is set to false. For simplicity and clarity, this example only tests for one connection type. A real-world use case would likely use a switch statement or some other method to check all of the possible values of NetworkInformation.type. Regardless of the type value you can get an estimate of connection speed through the NetworkInformation.effectiveType property.

let preloadVideo = true;
var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
if (connection) {
  if (connection.type === 'cellular') {
    preloadVideo = false;
  }
}

Interfaces

NetworkInformation
Provides information about the connection a device is using to communicate with the network and provides a means for scripts to be notified if the connection type changes. The NetworkInformation interfaces cannot be instantiated. It is instead accessed through the Navigator interface.

Specifications

Specification Status Comment
Network Information API
The definition of 'Network Information API' in that specification.
Draft Initial specification

Browser compatibility

NetworkInformation

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support61 No No No48 No
Available in workers61 No No ?48 ?
downlink61 No No ?48 ?
downlinkMax61 No No No48 No
effectiveType61 No No No48 No
onchange61 No No No48 No
rtt61 No No No48 No
type61 No No No48 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5038 ?3137 No ?
Available in workers5038 ?5337 ? ?
downlink5038 ? ?37 ? ?
downlinkMax5038 ? No37 No ?
effectiveType5038 ? Yes37 ? ?
onchange5038 ? No137 No ?
rtt5038 ? No37 No ?
type5038 ? No37 No ?

1. On Firefox, the event handler property corresponding to the change event is ontypechange.

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support61 ? ? No ? No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5038 ?14137 No ?

1. The Network API is enabled by default. Can be disabled using the dom.netinfo.enabled preference.

See also

Document Tags and Contributors

Last updated by: fscholz,