Science Knowings: HTML Course For Social Media

HTML5 Network Information API

Introduction to HTML5 Network Information API

Welcome to the HTML5 Network Information API! In this session, we'll explore how to access and use information about the user's network connection, such as type, speed, and online/offline status.

What is the Network Information API?

The Network Information API is a JavaScript API that provides developers with access to real-time information about the user's network connection. This API is especially useful for building responsive and adaptive web applications that can adjust their behavior based on the user's network conditions.

Features of the Network Information API

The Network Information API offers a range of features, including:

  • Network connection type detection
  • Online/offline status monitoring
  • Round-trip time (RTT) and downlink speed measurements
  • Ability to detect "save data" mode

Accessing Network Information

To access the Network Information API, you can use the navigator.connection property:

const connection = navigator.connection;

Network Connection Types

The connection.type property returns the type of network connection the user is currently using. Possible values include:

  • 'bluetooth'
  • 'cellular'
  • 'ethernet'
  • 'none'
  • 'wifi'
  • 'wimax'

Getting Online/Offline Status

The property indicates whether the user is currently online or offline. This property is a boolean value, returning true if online and false if offline:

const isOnline =;

RTT and Downlink Speed

The Network Information API also provides methods to measure the round-trip time (RTT) and downlink speed of the network connection:

// Measure RTT
connection.rtt.then(rtt => {
  console.log(`RTT: ${rtt} ms`);

// Measure downlink speed
connection.downlink.then(downlinkSpeed => {
  console.log(`Downlink speed: ${downlinkSpeed} Mbps`);

Save Data

The Network Information API includes a connection.saveData property, which indicates whether the user has enabled "save data" mode in their browser. When this mode is enabled, the browser may reduce data usage by optimizing image loading and pausing non-essential network requests.

Using the Network Information API

Here's a simple example of using the Network Information API to display network information in a web application:

const div = document.querySelector('div');

// Update network information on connection change
navigator.connection.addEventListener('change', () => {
  const type = navigator.connection.type;
  const isOnline =;
  // Display network information
  div.innerHTML = `
<p>Network Type: ${type}</p>
    <p>Online Status: ${isOnline ? 'Online' : 'Offline'}</p>

Syntax and Methods

Here's a summary of the Network Information API's syntax and methods:

  • navigator.connection: The main entry point to the API.
  • connection.type: Returns the network connection type.
  • Returns whether the user is online or offline.
  • connection.rtt: Measures the round-trip time.
  • connection.downlink: Measures the downlink speed.
  • connection.saveData: Indicates whether "save data" mode is enabled.


The Network Information API supports the following events:

  • change: Triggered when the network connection changes.

Real-World Uses

The Network Information API has numerous practical applications, such as:

  • Adapting UI and content based on connection speed
  • Displaying real-time network status updates
  • Optimizing data usage in "save data" mode
  • Improving user experience by handling network connectivity issues gracefully

Advantages of Using the Network Information API

Benefits of using the Network Information API include:

  • Enhanced user experience
  • Improved reliability and performance
  • Increased developer control over network-related behaviors


The HTML5 Network Information API empowers developers to access and utilize information about the user's network connection. This API enables the creation of responsive and adaptive web applications that can enhance the user experience and optimize performance based on network conditions. We encourage you to explore and implement this API to improve your web applications.

Next Up: HTML5 Ambient Light Sensor API

In the next session, we'll dive into the HTML5 Ambient Light Sensor API, which provides access to real-time light intensity information. Don't miss it! Follow us for more exciting web development topics.