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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.

Detecting 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 is change from " + type + " to " + connection.type);
}

connection.addEventListener('typechange', updateConnectionStatus);

Interfaces

NetworkInformation
Provides information about the connection a device is using to commuinicate 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.
Editor's Draft Initial specification

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (since at least 58) No support No support No support No support
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 2.2 webkit 12.0 (12)[1] No support No support No support
Available in workers ? 53.0 (53) No support No support No support

[1] The Network API can be disabled using the dom.netinfo.enabled preference.

See also