Node.js Passport OCR

// Import necessary libraries
const axios = require('axios');
const fs = require('fs');
const FormData = require('form-data');

// Specify variables for use in script below
const apiBaseUrl = 'https://app.butlerlabs.ai/api';

// Make sure to add the API Key you wrote down above to the auth headers
const apiKey = 'MY_API_KEY';
const authHeaders = {
  'Authorization': 'Bearer ' + apiKey
};

// Use the Queue API Id you grabbed earlier
const queueId = 'MY_QUEUE_ID';

// Specify the path to the file you would like to process
const localFilePaths = ['/path/to/file'];

// Specify the API URL
const uploadUrl = apiBaseUrl + '/queues/' + queueId + '/uploads';

// This async function uploads the files passed to it and returns the id
// needed for fetching results.
// It is used in our main execution function below
const uploadFiles = async (filePaths) => {
  // Prepare file for upload
  const formData = new FormData();
  filePaths.forEach((filePath) => {
    formData.append('files', fs.createReadStream(filePath));
  });

  // Upload files to the upload API
  console.log('Uploding files to Butler for processing');
  const uploadResponse = await axios.post(
    uploadUrl,
    formData,
    {
      headers: {
        ...authHeaders,
        ...formData.getHeaders(),
      }
    })
    .catch((err) => console.log(err));

  // Return the Upload ID
  return uploadResponse.data.uploadId;
}

// This async function polls every 5 seconds for the extraction results using the
// upload id provided and returns the results once ready
const getExtractionResults = async (uploadId) => {
  // URL to fetch the result
  const extractionResultsUrl = apiBaseUrl + '/queues/' + queueId + '/extraction_results';
  const params = { uploadId };

  // Simple helper function for use while polling on results
  const sleep = (waitTimeInMs) => new Promise(resolve => setTimeout(resolve, waitTimeInMs));

  // Make sure to poll every few seconds for results.
  // For smaller documents this will typically take only a few seconds
  let extractionResults = null;
  while (!extractionResults) {
    console.log('Fetching extraction results');
    const resultApiResponse = await axios.get(
      extractionResultsUrl,
      { headers: { ...authHeaders }, params, }
    );

    const firstDocument = resultApiResponse.data.items[0];
    const extractionStatus = firstDocument.documentStatus;
    // If extraction has not yet completed, sleep for 5 seconds
    if (extractionStatus !== 'Completed') {
      console.log('Extraction still in progress. Sleeping for 5 seconds...');
      await sleep(5 * 1000);
    } else {
      console.log('Extraction results ready');
      return resultApiResponse.data;
    }
  }
}

// Use the main function to run our entire script
const main = async () => {
  // Upload Files
  const uploadId = await uploadFiles(localFilePaths);
  // Get the extraction results
  const extractionResults = await getExtractionResults(uploadId);

  // Print out the extraction results for each document
  extractionResults.items.forEach(documentResult => {
    const fileName = documentResult.fileName;
    console.log('Extraction results from ' + fileName);

    // Print out each field name and extracted value
    console.log('Fields')
    documentResult.formFields.forEach(field => {
      const fieldName = field.fieldName;
      const extractedValue = field.value;

      console.log(fieldName + ' : ' + extractedValue);
    });

    // Print out the results of each table
    console.log('\n\nTables');
    documentResult.tables.forEach(table => {
      console.log('Table name: ' + table.tableName);
      table.rows.forEach((row, idx) => {
        let rowResults = 'Row ' + idx + ': \n';
        row.cells.forEach(cell => {
          // Add each cells name and extracted value to the row results
          rowResults += cell.columnName + ': ' + cell.value + ' \n';
        });

        console.log(rowResults);
      });
    });
  });
}

main();

{
  "documentId": "330bf673-9fd9-4f35-9e30-2df8801ba7ce",
  "documentStatus": "Completed",
  "fileName": "sample_passport.jpeg",
  "mimeType": "image/jpeg",
  "documentType": "Passport",
  "confidenceScore": "High",
  "formFields": [
    {
      "fieldName": "Document Number",
      "value": "T123456M",
      "confidenceScore": "High"
    },
    {
      "fieldName": "First Name",
      "value": "MARYJO",
      "confidenceScore": "High"
    },
    {
      "fieldName": "Last Name",
      "value": "RAVELER",
      "confidenceScore": "High"
    },
    {
      "fieldName": "Birth Date",
      "value": "600101",
      "confidenceScore": "High"
    },
    {
      "fieldName": "Expiration Date",
      "value": "141231",
      "confidenceScore": "High"
    },
    {
      "fieldName": "Sex",
      "value": "F",
      "confidenceScore": "High"
    },
    {
      "fieldName": "Nationality",
      "value": "USA",
      "confidenceScore": "High"
    },
    {
      "fieldName": "Machine Readable Zone",
      "value": "PUSATRAVELER<<MARYJO<<<<<<<<<<<<<<<<<<<<<< T123456M<4USA6001010F1412314<<<<<<<<<<<<<<<2",
      "confidenceScore": "Low"
    }
  ],
  "tables": []
}