react-native-qrcode-package

QR Code generator and QR Code Scanner for React Native.

Features

• Rendering of QR code images from JSON file
• Scanning QR code images, data processing, log errors

Installation

npm i react-native-qrcode-package

Install dependency packages to generate qr code:

yarn add react-native-svg

Or

npm i react-native-svg

Install dependency packages to scan qr code:

yarn add react-native-camera

yarn add react-native-permissions

Or

npm i react-native-camera

npm i react-native-permissions

IMPORTANT New version of react-native-permissions (3.8.0) has breaking changes and doesn't work correctly on ios with camera permission. Use "react-native-permissions": "3.7.3" or below version.

After that for ios go to the folder your-project/ios and run pod install.

WARNING

You may got this warn after install react-native-camera: ViewPropTypes will be removed from React Native. Migrate to ViewPropTypes exported from 'deprecated-react-native-prop-types'. If you have warn then: go to the node-modules folder -> find react-native-camera folder -> src folder -> find the file RNCamera.js -> find inside the file: import ViewPropTypes from from 'react-native'; -> delete this import from 'react-native' -> create new import: import {ViewPropTypes} from 'deprecated-react-native-prop-types'; This is one of the solutions to this warn.

Requirements

iOS 10

With iOS 10 and higher you need to add the "Privacy - Camera Usage Description" key to the Info.plist of your project. This should be found in 'your_project/ios/your_project/Info.plist'. Add the following code:

<key>NSCameraUsageDescription</key>
<string>Your message to user when the camera is accessed for the first time</string>

Also you will need to add the following code to your Podfile (as part of the react-native-permissions setup):

permissions_path = '../node_modules/react-native-permissions/ios'
pod 'Permission-Camera', :path => "#{permissions_path}/Camera"

You may also need to reset your simulator data after adding those permissions Device -> Erase All

Android 7

With Android 7 and higher you need to add the "Vibration" permission to your AndroidManifest.xml of your project if you want to use vibration after a successful scan. This should be found in your android/app/src/main/AndroidManifest.xml Add the following:

<uses-permission android:name="android.permission.VIBRATE"/>

You need to add the "missingDimensionStrategy" config for the 'react-native-camera' setting to 'general', this should be found in your android/app/build.gradle add the following:

android {
  ...
  defaultConfig {
    ...
    missingDimensionStrategy 'react-native-camera', 'general' <-- insert this line
  }
}

Examples

GenerateQRCode

import GenerateQRCode from 'react-native-qrcode-package';

// Simple usage(all fields have default values except 'jsonObject')
 render() {
    return (
      <View>
        <GenerateQRCode
          jsonObject={data} // data - it's your json file(data.json)
          sizeQRcode={200}
        />
      </View>
    );
  }

// error handle
handleError = (error: undefined) => {
    console.error('Something went wrong', error);
  };
render() {
    return (
      <View>
        <GenerateQRCode
          jsonObject={data}
          onError={e => handleError(e)}
        />
      </View>
    );
  }

ScanQRCode

import ScanQRCode from 'react-native-qrcode-package';

// Simple usage(all fields have default values except 'onQRCodeScanned')
handleScanJsonObject = (json: object) => {
    console.log('QR Code data:', json);
  };
 render() {
    return (
      <View>
        <ScanQRCode
          onQRCodeScanned={handleScanJsonObject}
        />
      </View>
    );
  }

// error handle
handleError = (error: undefined) => {
    console.error('Something went wrong', error);
    Alert.alert(
      'Invalid QR Code',
      'The scanned QR code does not contain valid JSON',
      [
        {
          text: 'OK',
          onPress: () => {},
        },
      ],
    );
  };
render() {
    return (
      <View>
         <ScanQRCode
          onQRCodeScanned={handleScanJsonObject}
          onError={handleError}
        />
      </View>
    );
  }

Props

GenerateQRCode

Name	Default	Description
sizeQRCode	150	Size of rendered image in pixels
jsonObject	object	Put your a JSON .json file of the QR code. Example: '{"brand": "Name","model": "Model name"}'
colorQrCode	'black'	Color of the QR code
onError(error)	undefined	Callback fired when exception happened during the code generating process
backgroundColorQRCode	'white'	Color of the background QR code
enableLinearGradient	false	Enable or disable linear gradient
linearGradient	['rgb(255,0,0)','rgb(0,255,255)']	Array of 2 rgb colors used to create the linear gradient
gradientDirection	[170,0,0,0]	The direction of the linear gradient
logo	null	Image source object. Ex. {uri: 'base64string'} or {require('pathToImage')}
logoSize	20% of size	Size of the imprinted logo. Bigger logo equals less error correction in QR code
logoBackgroundColor	'transparent'	The logo gets a filled quadratic background with this color. Use 'transparent' if your logo already has its own backdrop.
logoMargin	2	Logo distance to it's wrapper
logoBorderRadius	0	Border-radius of logo image (Android isn't supported)
quietZone	0	Quiet zone around the qr in pixels (Useful when saving image to gallery)
getRef	null	Get SVG ref for further usage
ecl	'M'	Error correction level

Prop	Type
sizeQRCode	number
jsonObject	object
colorQrCode	string
onError(error)	Function
backgroundColorQRCode	string
enableLinearGradient	boolean
linearGradient	string []
gradientDirection	string []
logo	ImageSourcePropType
logoSize	number
logoBackgroundColor	string
logoMargin	number
logoBorderRadius	number
quietZone	number
getRef(c: any) => any	Function
ecl	'L' or 'M' or 'Q' or 'H'

ScanQRCode

Name	Default	Description
onQRCodeScanned(object)	-	Will call this specified method when a QR code is detected in the camera.
vibrateAfterScan	false	Vibrate after Scanned QR
reactivateCamera	true	Will reactivate the scanning ability of the component.
reactivateScanTimeout	0	Use this to configure how long it should take (in milliseconds) before the ScanQRCode should reactivate.
fadeImageIn	true	When set to true this ensures that the camera view fades in after the initial load up instead of being rendered immediately. Set this to false to prevent the animated fade in of the camera view.
showScanMarker	false	Use this to show marker on the camera scanning window.
cameraType	'back'	Use this to control which camera to use for scanning QR codes.(propType: ['front', 'back'])
customMarker	-	Pass a RN element/component to use it as a custom marker.
containerStyle	-	Use this to pass styling for the outermost container.
cameraStyle	-	Use this to pass or overwrite styling for the camera window rendered.
cameraContainerStyle	-	Use this to pass or overwrite styling for the camera container (view) window rendered.
markerStyle	-	Use this to add custom styling to the default marker.
topViewStyle	-	Use this to pass or overwrite styling for the '' that contains the topContent prop.
bottomViewStyle	-	Use this to pass or overwrite styling for the '' that contains the bottomContent prop.
topContent	-	Use this to render any additional content at the top of the camera view.(propType: oneOfType([ PropTypes.element, PropTypes.string, ]))
bottomContent	-	Use this to render any additional content at the bottom of the camera view.(propType: oneOfType([ PropTypes.element, PropTypes.string, ]))
notAuthorizedView	-	Pass a RN element/component to use it when no permissions given to a camera (only IOS).
permissionDialogTitle	'Permission'	Use this to set permission dialog title (only Android).(propType: string)
permissionDialogMessage	'Requires camera permission to scan'	Use this to set permission dialog message (only Android).(propType: string)
buttonPositive	'OK'	Use this to set permission dialog button text (only Android).(propType: string)
checkAndroid6Permissions	false	Use this to enable permission checking on Android 6.
lightMode	RNCamera.Constants.FlashMode.off	Part of the react-native-camera package react-native-camera/flashMode:RNCamera.Constants.FlashMode.off (turns it off) / RNCamera.Constants.FlashMode.on(means camera will use flash in all photos taken) / RNCamera.Constants.FlashMode.auto(leaves your phone to decide when to use flash when taking photos, based on the lightning conditions that the camera observes) / RNCamera.Constants.FlashMode.torch(turns on torch mode, meaning the flash light will be turned on all the time (even before taking photo) just like a flashlight).
onError(error: Error)	'this is handling errors that occurred during scanning'	Callback fired when exception happened during the scanning process
cameraScanTimeout	0	Use this to configure how long it should take (in milliseconds) before the ScanQRCode should be displayed. After that the camera will be inactive and press the view to reactivate it.
cameraProps	-	Properties to be passed to the Camera component.(prop type: object)
cameraTimeoutView	-	Pass an RN element/component to show it when the camera is inactive for cameraScanTimeout (another prop) milliseconds. If the cameraScanTimeout is 0 or not specified, this prop will never be used.

Prop	Type
onQRCodeScanned(json: object) => void	Function
vibrateAfterScan	boolean
reactivateCamera	boolean
reactivateScanTimeout	number
fadeImageIn	boolean
showScanMarker	boolean
cameraType	'front'
customMarker	JSX.Element
containerStyle	StyleProp
cameraStyle	StyleProp
cameraContainerStyle	StyleProp
markerStyle	StyleProp
topViewStyle	StyleProp
bottomViewStyle	StyleProp
topContent	JSX.Element or string
bottomContent	JSX.Element or string
notAuthorizedView	JSX.Element
permissionDialogTitle	string
permissionDialogMessage	string
buttonPositive	string
checkAndroid6Permissions	boolean
lightMode	RNCamera.Constants.FlashMode.off or RNCamera.Constants.FlashMode.on or RNCamera.Constants.FlashMode.auto or RNCamera.Constants.FlashMode.torch
onError(error: undefined) => void	Function
cameraScanTimeout	number
cameraProps	RNCameraProps
cameraTimeoutView	JSX.Element