The backend provides RESTful API endpoints for PDF processing operations.

All API endpoints are prefixed with /api/pdf/

Merge multiple PDF files into one.

• Body: FormData with multiple file0, file1, etc. fields
• Response: PDF file download or JSON error

Split a PDF into specific pages or page ranges.

• Body: FormData with file0 and options (JSON string)
• Options: { mode: 'pages'|'range', pages?: number[], startPage?: number, endPage?: number }
• Response: PDF file download or JSON error

Convert PDF pages to images (info only - actual conversion requires additional libraries).

• Body: FormData with file0 and options
• Options: { format?: 'png'|'jpg', dpi?: number }
• Response: JSON with conversion info

Convert images to a PDF document.

• Body: FormData with multiple image files
• Response: PDF file download or JSON error

Compress a PDF file (basic compression by re-saving).

• Body: FormData with file0
• Response: PDF file download or JSON error

Get PDF metadata and information.

• Body: FormData with file0
• Response: JSON with PDF info

Add password protection to PDF (note: requires additional libraries).

• Body: FormData with file0 and options
• Options: { password: string }
• Response: JSON message (protection not fully implemented)

Rotate PDF pages by specified angle.

• Body: FormData with file0 and options
• Options: { angle: 90|180|270, pages?: number[] }
• Response: PDF file download or JSON error

All endpoints return JSON error responses with { success: false, message: string } format when errors occur.

• Maximum file size: 50MB per file
• Files are processed in memory and not stored permanently