Bulgaria Passport OCR with the StructOCR Node.js SDK

Why Bulgarian Passport OCR is Difficult in Node.js

Building a reliable passport OCR pipeline from scratch is non-trivial for Bulgarian documents. The Bulgarian passport features a bilingual layout, presenting personal data in Bulgarian Cyrillic alongside English. The coexistence of Cyrillic characters—including unique letters such as ъ, ь, ю, я, and the distinctive щ—with Latin script frequently confuses standard Node.js wrappers like Tesseract, causing character substitution errors (e.g., В/B, Р/P) and misaligned field extraction. Furthermore, the documents incorporate intricate security backgrounds, guilloche patterns, and the national coat of arms that introduce optical noise. Developing custom RegEx patterns in JavaScript to parse the Machine Readable Zone (MRZ) while correcting these script-mixing alignment issues is highly brittle, often resulting in high manual review rates.

Enterprise-Grade Extraction with the StructOCR SDK

StructOCR simplifies document processing in your JavaScript ecosystem by replacing complex pipelines with a single async API call. Our service leverages pre-trained Deep Learning models optimized specifically for Southeastern European identity documents and the complexities of Cyrillic/English bilingual typography. Our passport mrz ocr api automatically handles perspective correction, denoising, and glare removal. Instead of returning raw, unstructured text strings, the StructOCR Node.js SDK provides standardized JSON output with validated fields. This capability is crucial for applications managing international borders, as it eliminates the need for manual parsing, delivering production-ready data directly to your Express, NestJS, or Next.js applications. For the fastest Node.js integration, install the official StructOCR SDK and see the Node.js SDK documentation.

Production Use Cases

• Digital Onboarding (e-KYC): Reduce drop-off rates by pre-filling user data from Bulgarian Passports into your fintech or digital services apps in under 2 seconds.
• Travel & Aviation Apps: Seamlessly integrate with Node.js backends for automated check-in systems and border management at hubs like Sofia Airport (SOF).
• Financial Compliance: Ensure strict compliance with the Bulgarian National Bank (BNB) and European Anti-Money Laundering (AML) regulations by automatically and accurately verifying identity documents.

Bulgaria Passport OCR with the Node.js SDK

The official Node.js SDK handles file buffers, API communication, and structured passport results. Use the SDK directly or open the TypeScript + Express tab for a server endpoint. Keep your API key in STRUCTOCR_API_KEY.

Prerequisite: `npm install structocr`; set the server-side `STRUCTOCR_API_KEY` environment variable.

Prefer another stack? Open the Python SDK + FastAPI integration.

const StructOCR = require('structocr');

// Initialize the client with your API key
const apiKey = process.env.STRUCTOCR_API_KEY;
if (!apiKey) throw new Error('STRUCTOCR_API_KEY is not configured');
const client = new StructOCR(apiKey);

async function scanBulgariaPassport() {
  // Note: Supports JPG, PNG, WebP, PDF (Max 4.5MB)
  const imagePath = './bulgaria_passport_sample.jpg';

  try {
    console.log(`Processing Bulgaria passport: ${imagePath}...`);

    // The SDK handles file reading and the API call seamlessly
    const result = await client.scanPassport(imagePath);

    if (result.success && result.data) {
      const data = result.data;
      console.log('✅ Extraction Successful!');
      
      // Basic Identity (MRZ + VIZ)
      console.log(`Passport #: ${data.passport_number}`);
      console.log(`Name:       ${data.surname} ${data.given_names}`);
      console.log(`Nation:     ${data.nationality} (${data.country_code})`);
      
      // Visual Zone Specifics
      console.log(`Birth Place:${data.place_of_birth}`);
      console.log(`Authority:  ${data.issuing_authority}`);
      
      // Dates
      console.log(`DOB:        ${data.date_of_birth} (${data.sex})`);
      console.log(`Expiry:     ${data.date_of_expiry}`);

    } else {
      console.error('❌ Extraction Failed:', result.error || 'Unknown Error');
    }
  } catch (error) {
    console.error('An unexpected error occurred:', error.message);
  }
}

scanBulgariaPassport();

Sample JSON Output

The Node.js SDK returns an object matching this normalized JSON structure.

{
  "success": true,
  "data": {
    "type": "passport",
    "country_code": "BGR",
    "nationality": "BGR",
    "passport_number": "A1234567",
    "surname": "IVANOV",
    "given_names": "GEORGI",
    "sex": "M",
    "date_of_birth": "1993-06-18",
    "place_of_birth": "SOFIA",
    "date_of_issue": "2023-02-14",
    "date_of_expiry": "2028-02-13",
    "issuing_authority": "MINISTRY OF INTERIOR"
  }
}