@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, macOS, Windows & Web. 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

Using React Native >= 0.60

Linking the package manually is not required anymore with Autolinking.

• iOS Platform:

  $ npx pod-install # CocoaPods on iOS needs this extra step

• Android Platform with AndroidX:

  Modify your android/build.gradle configuration:

  buildscript {
    ext {
      buildToolsVersion = "xx.yy.zz"
      minSdkVersion = xyz
      compileSdkVersion = xyz
      targetSdkVersion = xyz
      androidXCore = "1.7.0" // <-- Add this. Check versions here: https://developer.android.com/jetpack/androidx/releases/core
    }
  

• macOS Platform:

  Autolinking is not yet available on macOS. See the Manual linking steps for macOS below.

Manually link the library on macOS

1. Open your project .xcodeproj on xcode.

2. Right click on the Libraries folder and select Add files to "yourProjectName".

3. Add RNCNetInfo.xcodeproj (located at node_modules/@react-native-community/react-native-netinfo/macos) to your project Libraries.

4. Go to Build Phases -> Link Binary with Libraries and add: libRNCNetInfo-macOS.a.

• Windows Platform:

  Autolinking automatically works on RNW >= 0.63.

Minimum supported versions for windows

• react-native-windows 0.63 or newer
• MSVC build tools v142 (included in Visual Studio 2019) or newer
• x86, x64, or arm64 are supported, arm (32-bit) is not supported

React Native Compatibility

To use this library you need to ensure you are using the correct version of React Native. We support react-native 0.60+ with auto-linking.

If you are using a version of React Native that is lower than 0.60 check older versions of this README for details, but no support will be provided.

Browser Compatilibity

The web implementation heavily depends on the Network Information API which is still an is an experimental technology and thus it's not supported in every browser. If this API is not available the library will safely fallback to the old onLine property and return basic connection information.

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";

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();

Get the network state once:

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

API

• Types:
  • NetInfoState
  • NetInfoStateType
  • NetInfoCellularGeneration
• Methods:
  • fetch()
  • refresh()
  • 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, null	If there is an active network connection. Defaults to null on most platforms for unknown networks. Note: Web browsers report network type unknown for many otherwise valid networks (https://caniuse.com/netinfo), so isConnected may be true or false and represent a real connection status even for unknown network types in certain cases.
isInternetReachable	boolean, null	If the internet is reachable with the currently active network connection. If unknown defaults to null
isWifiEnabled	boolean	(Android only) Whether the device's WiFi is ON or OFF.
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

details has these properties:

Property	Platform	Type	Description
isConnectionExpensive	Android, iOS, macOS, Windows, Web	boolean	If the network connection is considered "expensive". This could be in either energy or monetary terms.
ssid	Android, iOS (not tvOS), Windows	string	The SSID of the network. May not be present, null, or an empty string if it cannot be determined. On iOS, your app must meet at least one of the following requirements and you must set the shouldFetchWiFiSSID configuration option or no attempt will be made to fetch the SSID. On Android, you need to have the ACCESS_FINE_LOCATION permission in your AndroidManifest.xml and accepted by the user.
bssid	Android, iOS (not tvOS), Windows*	string	The BSSID of the network. May not be present, null, or an empty string if it cannot be determined. On iOS, make sure your app meets at least one of the following requirements. On Android, you need to have the ACCESS_FINE_LOCATION permission in your AndroidManifest.xml and accepted by the user.
strength	Android, Windows	number	An integer number from 0 to 100 for the signal strength. May not be present if the signal strength cannot be determined.
ipAddress	Android, iOS, macOS, Windows	string	The external IP address. Can be in IPv4 or IPv6 format. May not be present if it cannot be determined.
subnet	Android, iOS, macOS	string	The subnet mask in IPv4 format. May not be present if it cannot be determined.
frequency	Android, Windows*	number	Network frequency. Example: For 2.4 GHz networks, the method will return 2457. May not be present if it cannot be determined.

* Requires wiFiControl capability in appxmanifest. Without it, these values will be null.

type is cellular

details has these properties:

Property	Platform	Type	Description
isConnectionExpensive	Android, iOS, macOS, Windows, Web	boolean	If the network connection is considered "expensive". This could be in either energy or monetary terms.
cellularGeneration	Android, iOS, Windows	NetInfoCellularGeneration	The generation of the cell network the user is connected to. This can give an indication of speed, but no guarantees.
carrier	Android, iOS	string	The network carrier name. May not be present or may be empty if none can be determined.

type is 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.

NetInfoStateType

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

Value	Platform	Description
none	Android, iOS, macOS, Windows, Web	No network connection is active
unknown	Android, iOS, macOS, Windows, Web	The network state could not or has yet to be be determined
cellular	Android, iOS, Windows, Web	Active network over cellular
wifi	Android, iOS, macOS, Windows, Web	Active network over Wifi
bluetooth	Android, Web	Active network over Bluetooth
ethernet	Android, macOS, Windows, Web	Active network over wired ethernet
wimax	Android, Web	Active network over WiMax
vpn	Android	Active network over VPN
other	Android, iOS, macOS, Windows, Web	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
5g	Currently connected to a 5G cellular network. Includes NRNSA (iOS only) and NR type connections

NetInfoConfiguration

The configuration options for the library.

Property	Type	Default	Description
reachabilityUrl	string	https://clients3.google.com/generate_204	The URL to call to test if the internet is reachable. Only used on platforms which do not supply internet reachability natively or if useNativeReachability is false.
reachabilityMethod	NetInfoMethodType	HEAD	The HTTP request method to use to call reachabilityUrl URL to call to test if the internet is reachable. Defaults to HEAD. GET is also available
reachabilityTest	(response: Response) => boolean	Promise.resolve(response.status === 204)	A function which is passed the Response from calling the reachability URL. It should return true if the response indicates that the internet is reachable. Only used on platforms which do not supply internet reachability natively or if useNativeReachability is false.
reachabilityShortTimeout	number	5 seconds	The number of milliseconds between internet reachability checks when the internet was not previously detected. Only used on platforms which do not supply internet reachability natively or if useNativeReachability is false.
reachabilityLongTimeout	number	60 seconds	The number of milliseconds between internet reachability checks when the internet was previously detected. Only used on platforms which do not supply internet reachability natively or if useNativeReachability is false.
reachabilityRequestTimeout	number	15 seconds	The number of milliseconds that a reachability check is allowed to take before failing. Only used on platforms which do not supply internet reachability natively or if useNativeReachability is false.
reachabilityShouldRun	() => boolean	() => true	A function which returns a boolean to determine if checkInternetReachability should be run.
shouldFetchWiFiSSID	boolean	false	A flag indicating one of the requirements on iOS has been met to retrieve the network (B)SSID, and the native SSID retrieval APIs should be called. This has no effect on Android.
useNativeReachability	boolean	true	A flag indicating whether or not Netinfo should use native reachability checks, if available.

Methods

configure()

Configures the library with the given configuration. You only need to supply the properties which you want to change from the default values.

Note that calling this will stop all previously added listeners from being called again. It is best to call this right when your application is started to avoid issues.

Example:

NetInfo.configure({
  reachabilityUrl: 'https://clients3.google.com/generate_204',
  reachabilityTest: async (response) => response.status === 204,
  reachabilityLongTimeout: 60 * 1000, // 60s
  reachabilityShortTimeout: 5 * 1000, // 5s
  reachabilityRequestTimeout: 15 * 1000, // 15s
  reachabilityShouldRun: () => true,
  shouldFetchWiFiSSID: true, // met iOS requirements to get SSID. Will leak memory if set to true without meeting requirements.
  useNativeReachability: false
});

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

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

You can optionally send configuration when setting up the hook. Note that configuration is global for the library, so you shouldn't send different configuration for different hooks. It is instead recommended that you called NetInfo.configure() once when your project starts. The hook option is only provided as a convinience.

const YourComponent = () => {
  const netInfo = useNetInfo({
    reachabilityUrl: 'https://clients3.google.com/generate_204',
    reachabilityTest: async (response) => response.status === 204,
    reachabilityLongTimeout: 60 * 1000, // 60s
    reachabilityShortTimeout: 5 * 1000, // 5s
    reachabilityRequestTimeout: 15 * 1000, // 15s
    reachabilityShouldRun: () => true,
    shouldFetchWiFiSSID: true, // met iOS requirements to get SSID
    useNativeReachability: false
  });

  // ...
};

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);
});

You can optionally send an interface string so the Promise resolves to a NetInfoState from the NetInfoStateType indicated in interface argument.

NetInfo.fetch("wifi").then(state => {
  console.log("SSID", state.details.ssid);
  console.log("BSSID", state.details.bssid);
  console.log("Is connected?", state.isConnected);
});

refresh()

Updates NetInfo's internal state, then returns a Promise that resolves to a NetInfoState object. This is similar to fetch(), but really only useful on platforms that do not supply internet reachability natively. For example, you can use it to immediately re-run an internet reachability test if a network request fails unexpectedly.

Example:

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

This will also update subscribers using addEventListener and/or useNetInfo.

Troubleshooting

Errors when building on Android

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 mockRNCNetInfo from '@react-native-community/netinfo/jest/netinfo-mock.js';

jest.mock('@react-native-community/netinfo', () => mockRNCNetInfo);

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.

Switching between different Wi-Fi does not send events in iOS

The SCNetworkReachability API used in iOS does not send events to the app in the background, so switching from one Wi-Fi network to another when your App was in background will not send an event and your network state will be out of sync with device state. To be sure you have up to date status when your app is in foreground again, you should re-fetch state each time when App comes to foreground, something like this:

  useEffect(() => {
    const subAppState = AppState.addEventListener("change", async (nextAppState) => {
      if (IS_IOS_DEVICE && nextAppState=='active') {
        let newNetInfo = await NativeModules.RNCNetInfo.getCurrentState('wifi');
        //your code here 
      }
    });
    const unsubNetState = NetInfo.addEventListener(state => {
        //your code here
    });
    return () => {
        if (subAppState) {
            subAppState.remove();
        }
        unsubNetState();
    };
  },[]);

Maintainers

• Mike Hardy

Maintainers Emeritus

• 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.

Changelog

9.2.0 (2022-06-28)

Features

• add support for reachabilityMethod to specify GET or HEAD (#610) (3f5badd)