High performance barcode scanner for React Native using VisionCamera.

• Modern and future-proof: Built on react-native-vision-camera@4 with minimal native dependencies for each platforms to minimize future build-failure risk.

• Minimal footprint: Leverages Google's MLKit BarcodeScanner on Android and Apple's Vision VNDetectBarcodesRequest.

• Powerful & Performant: The implementation has been tailored for advanced use cases where performance is critical. Scanning barcodes is butter smooth at 30fps, and you can customize the detection speed loop (detection fps). Template functionality can provide easy access to high-refresh rate video streams, including 60fps video input on some Android/iOS devices.

• Hooks based: Exposes a single, easy-to-use hook useBarcodeScanner

A working project can be found at vision-camera-simple-scanner/example.

[!WARNING] The project is currently trying to closely track react-native-vision-camera@4, The latest 2.x releases are made to work with the latest react-native-vision-camera@4 (currently 4.0.1)

The example application provides a patch file to work around most of the preview-related orientation issues in vision-camera. Since barcode scanning doesn't involve saving photos or video, this patch is only tested to work with previewing photo/video. Use at your own risk.

If you're using JSC instead of hermes, you will need an additional patch to react-native-worklets-core. See the patch file in the example project. This patch is not required when using hermes, but as far as I can tell it doesn't cause any issues.

npm install vision-camera-simple-scanner
# or
yarn add vision-camera-simple-scanner
# or
pnpm add vision-camera-simple-scanner

This package relies on:

• react-native-vision-camera@>=4
• react-native-worklets-core

You must add them as dependencies to your project:

npm install react-native-vision-camera react-native-worklets-core
# or
yarn add react-native-vision-camera react-native-worklets-core
# or
pnpm add react-native-vision-camera react-native-worklets-core

Then you must follow their respective installation instructions:

• react-native-worklets-core

The following quickstart example will dump any discovered codes to the console. For a more in-depth example, which renders the result of the scan on-screen, see the example project.

import type { FunctionComponent } from 'react';
import { StyleSheet, View } from 'react-native';
import {
  Camera,
  useCameraDevices,
  useCameraFormat,
} from 'react-native-vision-camera';
import { useBarcodeScanner, Templates } from 'vision-camera-simple-scanner';

export const App: FunctionComponent = () => {
  // @NOTE you must properly ask for camera permissions first!
  // You should use `PermissionsAndroid` for Android and `Camera.requestCameraPermission()` on iOS.

  // Here's the functionality of this library; configure it for your use case,
  // pass the props to react-native-vision-camera, and you're good to go!
  const { props: cameraProps } = useBarcodeScanner({
    fps: 30,
    barcodeTypes: ['qr', 'ean-13'], // optional
    onBarcodeScanned: (barcodes) => {
      'worklet';
      // this will get called every frame that one or more barcodes are detected
      console.log(
        `Scanned ${barcodes.length} codes with values=${JSON.stringify(
          barcodes.map(({ value }) => value),
        )} !`,
      );
    },
  });

  // Typical react-native-vision-camera setup
  const devices = useCameraDevices();
  const device = devices.find(({ position }) => position === 'back');
  if (!device) {
    return null;
  }

  return (
    <View style={{ flex: 1 }}>
      <Camera
        style={StyleSheet.absoluteFill}
        device={device}
        isActive
        {...cameraProps}
      />
    </View>
  );
};

Heavily based on code from

• mgcrea/vision-camera-barcode-scanner

• Max Gurela <mgurela@ptc.com>

The MIT License

Copyright (c) 2024 Max Gurela <mgurela@ptc.com>

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of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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