@react-native-community/netinfo

What is @react-native-community/netinfo?

@react-native-community/netinfo is a React Native library that provides information about the device's network connection state. It allows developers to detect the type of network connection (WiFi, cellular, etc.), whether the device is connected to the internet, and other related details.

What are @react-native-community/netinfo's main functionalities?

Check current network state

This feature allows you to fetch the current network state, including the connection type (e.g., WiFi, cellular) and whether the device is connected to the internet.

import NetInfo from '@react-native-community/netinfo';

NetInfo.fetch().then(state => {
  console.log('Connection type', state.type);
  console.log('Is connected?', state.isConnected);
});

Subscribe to network state changes

This feature allows you to subscribe to network state changes, so you can react to changes in the network connection in real-time.

import NetInfo from '@react-native-community/netinfo';

const unsubscribe = NetInfo.addEventListener(state => {
  console.log('Connection type', state.type);
  console.log('Is connected?', state.isConnected);
});

// Later, you can unsubscribe to stop listening for updates
unsubscribe();

Check if the device is connected to the internet

This feature allows you to check if the device is currently connected to the internet.

import NetInfo from '@react-native-community/netinfo';

NetInfo.fetch().then(state => {
  console.log('Is connected?', state.isConnected);
});

Get detailed network information

This feature provides detailed information about the network connection, including whether the internet is reachable and additional details specific to the connection type.

import NetInfo from '@react-native-community/netinfo';

NetInfo.fetch().then(state => {
  console.log('Connection type', state.type);
  console.log('Is connected?', state.isConnected);
  console.log('Is internet reachable?', state.isInternetReachable);
  console.log('Details:', state.details);
});

Other packages similar to @react-native-community/netinfo

react-native-network-info

react-native-network-info is another React Native library that provides information about the device's network state. It offers functionalities such as getting the SSID of the connected WiFi network and the IP address of the device. However, it does not provide as comprehensive a set of features for monitoring network state changes as @react-native-community/netinfo.

react-native-connection-info

react-native-connection-info is a library that provides basic information about the network connection, such as the connection type and whether the device is connected to the internet. It is simpler and less feature-rich compared to @react-native-community/netinfo, making it suitable for applications that need only basic network information.

README

@react-native-community/netinfo

React Native Network Info API for Android, iOS & Windows. It allows you to get information on:

• Connection type
• Connection quality

Getting started

Install the library using either Yarn:

yarn add @react-native-community/netinfo

or npm:

npm install --save @react-native-community/netinfo

You then need to link the native parts of the library for the platforms you are using. The easiest way to link the library is using the CLI tool by running this command from the root of your project:

react-native link @react-native-community/netinfo

If you can't or don't want to use the CLI tool, you can also manually link the library using the instructions below (click on the arrow to show them):

Manually link the library on iOS

Either follow the instructions in the React Native documentation to manually link the framework or link using Cocoapods by adding this to your Podfile:

pod 'react-native-netinfo', :path => '../node_modules/@react-native-community/netinfo'

Manually link the library on Android

Make the following changes:

android/settings.gradle

include ':react-native-community-netinfo'
project(':react-native-community-netinfo').projectDir = new File(rootProject.projectDir, '../node_modules/@react-native-community/netinfo/android')

android/app/build.gradle

dependencies {
   ...
   implementation project(':react-native-community-netinfo')
}

android/app/src/main/.../MainApplication.java

On top, where imports are:

import com.reactnativecommunity.netinfo.NetInfoPackage;

Add the NetInfoPackage class to your list of exported packages.

@Override
protected List<ReactPackage> getPackages() {
    return Arrays.asList(
            new MainReactPackage(),
            new NetInfoPackage()
    );
}

Manually link the library on Windows

• Open the solution in Visual Studio for your Windows apps
• Right click in the Explorer and click Add > Existing Project...
• Navigate to ./<app-name>/node_modules/@react-native-community/netinfo/windows/RNCNetInfo/ and add RNCNetInfo.csproj
• This time right click on your React Native Windows app under your solutions directory and click Add > Reference...
• Check the RNCNetInfo you just added and press ok
• Open up MainReactNativeHost.cs for your app and edit the file like so:

+ using ReactNativeCommunity.NetInfo;
......
        protected override List<IReactPackage> Packages => new List<IReactPackage>
        {
            new MainReactPackage(),
+           new RNCNetInfoPackage(),
        };

Migrating from the core react-native module

This module was created when the NetInfo was split out from the core of React Native. To migrate to this module you need to follow the installation instructions above and then change you imports from:

import { NetInfo } from "react-native";

to:

import NetInfo from "@react-native-community/netinfo";

Note that the API was updated after it was extracted from NetInfo to support some new features, however, the previous API is still available and works with no updates to your code.

Usage

Import the library:

import NetInfo from "@react-native-community/netinfo";

Get the network state once:

NetInfo.fetch().then(state => {
  console.log("Connection type", state.type);
  console.log("Is connected?", state.isConnected);
});

Subscribe to network state updates:

// Subscribe
const unsubscribe = NetInfo.addEventListener(state => {
  console.log("Connection type", state.type);
  console.log("Is connected?", state.isConnected);
});

// Unsubscribe
unsubscribe();

API

• Types:
  • NetInfoState
  • NetInfoStateType
  • NetInfoCellularGeneration
• Methods:
  • fetch()
  • addEventListener()
  • useNetInfo()

Types

NetInfoState

Describes the current state of the network. It is an object with these properties:

Property	Type	Description
type	NetInfoStateType	The type of the current connection.
isConnected	boolean	If there is an active network connection. Note that this DOES NOT mean that internet is reachable.
details		The value depends on the type value. See below.

The details value depends on the type value.

type is none or unknown

details is null.

type is wifi, bluetooth, ethernet, wimax, vpn, or other

details has these properties:

Property	Type	Description
isConnectionExpensive	boolean	If the network connection is considered "expensive". This could be in either energy or monetary terms.

type is cellular

details has these properties:

Property	Type	Description
isConnectionExpensive	boolean	If the network connection is considered "expensive". This could be in either energy or monetary terms.
cellularGeneration	NetInfoCellularGeneration	The generation of the cell network the user is connected to. This can give an indication of speed, but no guarantees.

NetInfoStateType

Describes the current type of network connection. It is an enum with these possible values:

Value	Platform	Description
none	Android, iOS, Windows	No network connection is active
unknown	Android, iOS, Windows	The network state could not or has yet to be be determined
cellular	Android, iOS, Windows	Active network over cellular
wifi	Android, iOS, Windows	Active network over Wifi
bluetooth	Android	Active network over Bluetooth
ethernet	Android, Windows	Active network over wired ethernet
wimax	Android	Active network over WiMax
vpn	Android	Active network over VPN
other	Android, iOS, Windows	Active network over another type of network

NetInfoCellularGeneration

Describes the current generation of the cellular connection. It is an enum with these possible values:

Value	Description
null	Either we are not currently connected to a cellular network or type could not be determined
2g	Currently connected to a 2G cellular network. Includes CDMA, EDGE, GPRS, and IDEN type connections
3g	Currently connected to a 3G cellular network. Includes EHRPD, EVDO, HSPA, HSUPA, HSDPA, and UTMS type connections
4g	Currently connected to a 4G cellular network. Includes HSPAP and LTE type connections

Methods

fetch()

Returns a Promise that resolves to a NetInfoState object.

Example:

NetInfo.fetch().then(state => {
  console.log("Connection type", state.type);
  console.log("Is connected?", state.isConnected);
});

addEventListener()

Subscribe to connection information. The callback is called with a parameter of type NetInfoState whenever the connection state changes. Your listener will be called with the latest information soon after you subscribe and then with any subsequent changes afterwards. You should not assume that the listener is called in the same way across devices or platforms.

Parameter	Type	Description
listener	(state: NetInfoState) => void	The listener which will be called whenever the connection state changes

Example:

// Subscribe
const unsubscribe = NetInfo.addEventListener(state => {
  console.log("Connection type", state.type);
  console.log("Is connected?", state.isConnected);
});

// Unsubscribe
unsubscribe();

useNetInfo()

A React Hook which can be used to get access to the latest state. It returns a hook with the NetInfoState type.

Example:

import {useNetInfo} from "@react-native-community/netinfo";

const YourComplement = () => {
  const netInfo = useNetInfo();

  return (
    <View>
      <Text>Type: {netInfo.type}</Text>
      <Text>Is Connected? {netInfo.isConnected}</Text>
    </View>
  );
};

Troubleshooting

Errors while running Jest tests

If you do not have a Jest Setup file configured, you should add the following to your Jest settings and create the jest.setup.js file in project root:

setupFiles: ['<rootDir>/jest.setup.js']

You should then add the following to your Jest setup file to mock the NetInfo Native Module:

import { NativeModules } from 'react-native';

NativeModules.RNCNetInfo = {
  getCurrentConnectivity: jest.fn(),
  isConnectionMetered: jest.fn(),
  addListener: jest.fn(),
  removeListeners: jest.fn()
};

Issues with the iOS simulator

There is a known issue with the iOS Simulator which causes it to not receive network change notifications correctly when the host machine disconnects and then connects to Wifi. If you are having issues with iOS then please test on an actual device before reporting any bugs.

Maintainers

• Matt Oakes - Freelance React Native Developer
• Mike Diarmid - Invertase

Contributing

Please see the contributing guide.

License

The library is released under the MIT license. For more information see LICENSE.