Last result: {result}
); }; ``` ### With specific device ID You could either get the device ID from the `MediaDevices` API yourself or make use of [react-media-devices](https://www.npmjs.com/package/react-media-devices) to list available devices: ```tsx import { useMediaDevices } from "react-media-devices"; import { useZxing } from "react-zxing"; const constraints: MediaStreamConstraints = { video: true, audio: false, }; export const BarcodeScanner = () => { const { devices } = useMediaDevices({ constraints }); const deviceId = devices?.[0]?.deviceId; const { ref } = useZxing({ paused: !deviceId, deviceId, }); return ; }; ``` ## Advanced Usage ### Torch > ⚠️ Torch support is not available for iOS devices. See [this issue](https://github.com/zxing-js/browser/issues/12). You can control the torch by accessing the `torch` property of the `useZxing` return value: ```tsx import { useZxing } from "react-zxing"; export const BarcodeScanner = () => { const { ref, torch: { on, off, isOn, isAvailable }, } = useZxing(); return ( <> {isAvailable ? ( ) : ( Unfortunately, torch is not available on this device. )} ); }; ``` Torch support is limited to devices that support the `torch` constraint. You can check if torch is available by checking the `isAvailable` property. ## Options| Name | Type | Default | Description |
|---|---|---|---|
| onDecodeResult | function | Called when a decode result is found. The result is an instance of Result . | |
| onDecodeError | function | Called when an decode error is found. The error is an instance of Exception | |
| onError | function | Called when any other error occurs, e.g. when the camera stream cannot be accessed. | |
| hints | Map<DecodeHintType, any> | A map of additional parameters to pass to the zxing decoder. | |
| timeBetweenDecodingAttempts | number | 300 | The time in milliseconds to wait between decoding attempts. |
| constraints | MediaStreamConstraints | { video: { facingMode: 'environment' }, audio: false } | The constraints to use when requesting the camera stream. |
| deviceId | string | You may pass an explicit device ID to stream from. | |
| paused | boolean | false | Stops the camera stream when true. |