PDF Downloader Service
Built a complete PDF generation service that enables users to convert styled HTML invoices into professional PDF documents. The application features a modern web interface where users can preview and download invoices with a single click.
Context
A full-stack PDF conversion service combining a Go backend with a responsive HTML/CSS/JavaScript frontend. The service uses headless Chrome via the chromedp library to render HTML with complete CSS support into high-quality PDF documents. Features include an interactive invoice template with dynamic date calculations, professional styling with gradients and decorative elements, and client-server integration.
The problem
Implementing reliable HTML-to-PDF conversion with full CSS support while maintaining performance. Managing headless Chrome processes efficiently and handling concurrent requests with proper timeout management.
Architecture & decisions
Utilized chromedp library for headless Chrome automation with A4 paper format specifications. Implemented REST API endpoint with proper error handling, CORS support for cross-origin requests, and frontend-side CSS embedding to ensure complete styling in generated PDFs.
What it does
- HTML to PDF Conversion
- Invoice Template Generator
- Professional Styling with CSS
- RESTful API
- Headless Chrome Integration
- CORS Support
- One-Click PDF Download
- Dynamic Date Calculations