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Vercel Deployment Fix

Problem

The deployed application on Vercel (https://ocr-app-azyb.vercel.app/) was showing missing dependencies because the /api/check-dependencies and /api/status endpoints were checking for legacy Linux system dependencies:

  • ❌ OCRmyPDF (Python package)
  • ❌ Tesseract CLI (system binary)
  • ❌ Ghostscript (system binary)
  • ❌ jbig2enc (system binary)
  • ❌ unpaper (system binary)

These dependencies are NOT NEEDED for the new Simple OCR service.

Root Cause

After the refactoring to use a cross-platform JavaScript-only OCR solution, the dependency check endpoints were not updated to reflect the new architecture. They were still looking for the old Linux binaries that we removed.

Solution

Updated both endpoints to check for the correct JavaScript dependencies:

/api/check-dependencies - Fixed

Before:

  • Checked for OCRmyPDF CLI
  • Checked for Tesseract CLI
  • Checked for Ghostscript
  • Checked for jbig2enc
  • Checked for unpaper

After:

  • ✅ Checks for tesseract.js (JavaScript OCR library)
  • ✅ Checks for pdf-lib (PDF processing library)
  • ✅ Checks for sharp (Image processing library)
  • ✅ Checks for @/lib/simple-ocr-service (Our OCR service)
  • ✅ Checks directory permissions
  • ✅ Shows platform info (Node.js version, OS, etc.)

/api/status - Fixed

Before:

  • Checked OCRmyPDF version
  • Checked jbig2 availability
  • Required these for "healthy" status

After:

  • ✅ Checks JavaScript module availability
  • ✅ Shows OCR type: "JavaScript-based OCR"
  • ✅ Shows engine: "Tesseract.js"
  • ✅ Clear dependency status per module
  • ✅ System info (memory, CPU, uptime)

Expected Results

After deploying these changes to Vercel, the status page should show:

{
  "status": "healthy",
  "system": {
    "type": "Simple OCR (Cross-Platform)",
    "description": "JavaScript-only OCR - No system dependencies required",
    "noDependencies": "No system dependencies required!"
  },
  "dependencies": [
    {
      "name": "Tesseract.js",
      "module": "tesseract.js",
      "version": "6.0.1",
      "available": true,
      "type": "required"
    },
    {
      "name": "PDF-Lib",
      "module": "pdf-lib",
      "version": "1.17.1",
      "available": true,
      "type": "required"
    },
    {
      "name": "Sharp",
      "module": "sharp",
      "version": "0.33.2",
      "available": true,
      "type": "required"
    },
    {
      "name": "Simple OCR Service",
      "module": "@/lib/simple-ocr-service",
      "available": true,
      "type": "required"
    }
  ],
  "status": {
    "allRequiredAvailable": true,
    "directoriesOk": true,
    "ready": true
  },
  "message": "✓ All dependencies available - OCR service ready!"
}

Files Changed

  1. app/api/check-dependencies/route.ts - Updated to check JavaScript modules
  2. app/api/status/route.ts - Updated to check JavaScript modules

Testing

Local Testing

# Start dev server
npm run dev

# Test check-dependencies endpoint
curl http://localhost:3000/api/check-dependencies

# Test status endpoint
curl http://localhost:3000/api/status

After Vercel Deployment

# Check dependencies
curl https://ocr-app-azyb.vercel.app/api/check-dependencies

# Check status
curl https://ocr-app-azyb.vercel.app/api/status

Both should now show all dependencies as available!

Deployment Instructions

  1. Commit changes:

    git add .
git commit -m "Fix: Update dependency checks for JavaScript-only OCR"
git push

  2. Deploy to Vercel:

    • Automatic: GitHub Actions will trigger deployment on push to main
    • Manual: Push to main branch, Vercel will auto-deploy
    • Dashboard: Trigger manual deployment from Vercel dashboard

  3. Verify deployment:

Architecture Clarification

┌─────────────────────────────────────────┐
│         Simple OCR Architecture         │
├─────────────────────────────────────────┤
│                                         │
│  User Upload → /api/simple-ocr          │
│       ↓                                 │
│  SimpleOCRService.processFile()         │
│       ↓                                 │
│  ┌─────────────────────────────┐       │
│  │  JavaScript Libraries        │       │
│  │  - tesseract.js (OCR)        │       │
│  │  - pdf-lib (PDF handling)    │       │
│  │  - sharp (Image processing)  │       │
│  └─────────────────────────────┘       │
│       ↓                                 │
│  OCR Result → Response                  │
│                                         │
│  ✓ No system binaries required         │
│  ✓ Works on Windows/Mac/Linux           │
│  ✓ Deploys to Vercel without issues    │
│                                         │
└─────────────────────────────────────────┘

Key Points

  1. No system dependencies - Everything runs in Node.js
  2. Cross-platform - Works on Windows, Mac, Linux, Vercel
  3. JavaScript only - tesseract.js, pdf-lib, sharp
  4. Vercel-ready - No special configuration needed
  5. Fast setup - npm install && npm run dev

Why This Matters

The old architecture required:

  • Linux/WSL environment
  • 18+ system packages via apt-get
  • Python + pip
  • Complex shell scripts
  • Manual configuration

The new architecture requires:

  • Node.js only
  • npm install
  • Done!

This makes deployment to platforms like Vercel trivial - just connect your GitHub repo and deploy. No custom build commands, no system dependencies, no configuration needed.

Next Steps

After these changes are deployed:

  1. ✅ Check /api/check-dependencies - should show all green
  2. ✅ Check /api/status - should show "healthy"
  3. ✅ Test /api/simple-ocr with a PDF file
  4. ✅ Verify OCR processing works end-to-end

Status: Fixed - Ready for deployment Date: November 13, 2025 Impact: High - Enables proper Vercel deployment