The JavaScript Side Hustle That Runs While I Sleep

Suleman Safdar

Follow

4 min read

·

Oct 26, 2025

11

Listen

Share

How I built a Chrome Extension + Firebase app that earns passive income by automating affiliate link sharing

Press enter or click to view image in full size

1. How It All Began

I didn’t set out to make money with JavaScript — I just wanted to automate my own browsing habits.
Every day, I’d open dozens of e-commerce tabs (Amazon, eBay, AliExpress), search for deals, and share them in group chats.

Then it hit me: What if I could automate all of that — and get paid for it?

So I built a JavaScript-based Chrome Extension that:

• Detects product links I visit
• Automatically converts them into affiliate links
• Syncs them with Firebase
• Shares trending ones to my Telegram group daily

A few hundred users later… it started making me $800+ a month in commissions.

2. The Tools That Made It Work

Here’s what my money-making JS stack looked like:

• Chrome Extension API → inject JS scripts into browser tabs
• Firebase Firestore → real-time storage and sync
• Node.js (Express) → handles API routing and link conversion