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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.

Completed1
Source Code
PDF Downloader Service

Technologies

GochromedpGorilla MuxHTML5CSS3JavaScriptChrome DevTools Protocol

Project Overview

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 seamless client-server integration.

Challenges

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.

Solutions

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.

Key Features

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
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