@vantezzen/react-native-document-scanner-plugin

v0.1.4

Published

2 years ago

A React Native plugin that lets you scan documents using Android and iOS

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react-native ios android

React Native Document Scanner

This is a React Native plugin that lets you scan documents using Android and iOS. You can use it to create apps that let users scan notes, homework, business cards, receipts, or anything with a rectangular shape.

| iOS | Android | | -------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------ | | Dollar-iOS | Dollar Android |

Install

npm install react-native-document-scanner-plugin
cd ios && pod install && cd ..

After installing the plugin, you need to follow the steps below

iOS

Open ios/Podfile and set platform :ios to 13 or higher
iOS requires the following usage description be added and filled out for your app in Info.plist:

NSCameraUsageDescription (Privacy - Camera Usage Description)

Android

Open android/gradle.properties and add org.gradle.jvmargs=-Xmx2048m

Expo

Using this library with Expo requires using Development Builds due to native dependencies.

Install the dependency using expo:

$ npx expo install react-native-document-scanner-plugin

To use the library, add it to your app.json plugin list:

{
  // ...
  "plugins": [
    // ...
    [
      "react-native-document-scanner-plugin",
      {
        "cameraPermissionText": "$(PRODUCT_NAME) needs access to your Camera to capture photos."
      }
    ]
  ]
}

Finally compile your development build locally or using EAS:

$ npx expo prebuild
# or
$ eas build

Examples

Basic Example

import React, { useState, useEffect } from 'react';
import { Image } from 'react-native';
import DocumentScanner from 'react-native-document-scanner-plugin';

export default () => {
  const [scannedImage, setScannedImage] = useState();

  const scanDocument = async () => {
    // start the document scanner
    const { scannedImages } = await DocumentScanner.scanDocument();

    // get back an array with scanned image file paths
    if (scannedImages.length > 0) {
      // set the img src, so we can view the first scanned image
      setScannedImage(scannedImages[0]);
    }
  };

  useEffect(() => {
    // call scanDocument on load
    scanDocument();
  }, []);

  return (
    <Image
      style={{ width: '100%', height: '100%' }}
      source={{ uri: scannedImage }}
    />
  );
};

Here's what this example looks like with several items

https://user-images.githubusercontent.com/26162804/160264220-0a77a55c-33b1-492a-9617-6d2c083b0583.mp4

https://user-images.githubusercontent.com/26162804/160264222-bef1ba3d-d6c1-43c8-ba2e-77ff5baef836.mp4

https://user-images.githubusercontent.com/26162804/161643046-57536193-0c6c-4edf-8f29-6f3ef9854dc5.mp4

https://user-images.githubusercontent.com/26162804/161643075-365b5008-4bc8-4507-969d-b2c188f372ec.mp4

https://user-images.githubusercontent.com/26162804/161643102-35283536-73a3-4b05-bd76-c06514ca3928.mp4

https://user-images.githubusercontent.com/26162804/161643126-f5c2461d-768d-481c-8dee-4d74a0cae778.mp4

https://user-images.githubusercontent.com/26162804/161643156-4ce1abac-d78b-4211-a99a-f0bebd40e2a6.mp4

https://user-images.githubusercontent.com/26162804/161643167-fc751455-1a1a-4b1c-b06f-a3a2cef0d0b0.mp4

https://user-images.githubusercontent.com/26162804/161643192-71db71af-392d-4b6a-b94d-851a3369dbf3.mp4

https://user-images.githubusercontent.com/26162804/161643203-2a265cc1-5cf1-4474-b43c-7b1b2dcba704.mp4

Limit Number of Scans

You can limit the number of scans. For example if your app lets a user scan a business card you might want them to only capture the front and back. In this case you can set maxNumDocuments to 2. This only works on Android.

import React, { useState, useEffect } from 'react';
import { Image } from 'react-native';
import DocumentScanner from 'react-native-document-scanner-plugin';

export default () => {
  const [scannedImage, setScannedImage] = useState();

  const scanDocument = async () => {
    // start the document scanner
    const { scannedImages } = await DocumentScanner.scanDocument({
      maxNumDocuments: 2,
    });

    // get back an array with scanned image file paths
    if (scannedImages.length > 0) {
      // set the img src, so we can view the first scanned image
      setScannedImage(scannedImages[0]);
    }
  };

  useEffect(() => {
    // call scanDocument on load
    scanDocument();
  }, []);

  return (
    <Image
      style={{ width: '100%', height: '100%' }}
      source={{ uri: scannedImage }}
    />
  );
};

https://user-images.githubusercontent.com/26162804/161643345-6fe15f33-9414-46f5-b5d5-24d88948e801.mp4

Remove Cropper

You can automatically accept the detected document corners, and prevent the user from making adjustments. Set letUserAdjustCrop to false to skip the crop screen. This limits the max number of scans to 1. This only works on Android.

import React, { useState, useEffect } from 'react';
import { Image } from 'react-native';
import DocumentScanner from 'react-native-document-scanner-plugin';

export default () => {
  const [scannedImage, setScannedImage] = useState();

  const scanDocument = async () => {
    // start the document scanner
    const { scannedImages } = await DocumentScanner.scanDocument({
      letUserAdjustCrop: false,
    });

    // get back an array with scanned image file paths
    if (scannedImages.length > 0) {
      // set the img src, so we can view the first scanned image
      setScannedImage(scannedImages[0]);
    }
  };

  useEffect(() => {
    // call scanDocument on load
    scanDocument();
  }, []);

  return (
    <Image
      style={{ width: '100%', height: '100%' }}
      source={{ uri: scannedImage }}
    />
  );
};

https://user-images.githubusercontent.com/26162804/161643377-cabd7f51-a16f-4f5e-938a-afb6f3b1c8cb.mp4

Documentation

scanDocument(...)

scanDocument(options?: ScanDocumentOptions | undefined) => Promise<ScanDocumentResponse>

Opens the camera, and starts the document scan

| Param | Type | | ------------- | ------------------------------------------------------------------- | | options | ScanDocumentOptions |

Returns: Promise<ScanDocumentResponse>

Interfaces

ScanDocumentResponse

| Prop | Type | Description | | ------------------- | --------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------- | | scannedImages | string[] | This is an array with either file paths or base64 images for the document scan. | | status | ScanDocumentResponseStatus | The status lets you know if the document scan completes successfully, or if the user cancels before completing the document scan. |

ScanDocumentOptions

| Prop | Type | Description | Default | | ----------------------- | ----------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------- | | letUserAdjustCrop | boolean | Android only: If true then once the user takes a photo, they get to preview the automatically detected document corners. They can then move the corners in case there needs to be an adjustment. If false then the user can't adjust the corners, and the user can only take 1 photo (maxNumDocuments can't be more than 1 in this case). | : true | | maxNumDocuments | number | Android only: The maximum number of photos an user can take (not counting photo retakes) | : 24 | | responseType | ResponseType | The response comes back in this format on success. It can be the document scan image file paths or base64 images. | : ResponseType.ImageFilePath |

Enums

ScanDocumentResponseStatus

| Members | Value | Description | | ------------- | ---------------------- | --------------------------------------------------------------------------------------------------------- | | Success | 'success' | The status comes back as success if the document scan completes successfully. | | Cancel | 'cancel' | The status comes back as cancel if the user closes out of the camera before completing the document scan. |

ResponseType

| Members | Value | Description | | ------------------- | ---------------------------- | ------------------------------------------------------------------------------- | | Base64 | 'base64' | Use this response type if you want document scan returned as base64 images. | | ImageFilePath | 'imageFilePath' | Use this response type if you want document scan returned as inmage file paths. |

License

Permission is hereby granted, free of charge, to any person obtaining a copy 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.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.