SellStream

One listing. Every platform.

SellStream lets you create a single item listing and automatically post it to Facebook Marketplace, Nextdoor, eBay, and Craigslist simultaneously — no copy-pasting, no logging into four different apps.

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What It Does

• Fill out one form with your item's photos, title, price, category, condition, and description
• SellStream posts it to every platform you're connected to at the same time
• Track all your active listings in one place
• Mark items as sold and watch your earnings log automatically in the Finances tab

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Tech Stack

Layer	Tech
Frontend	React, TypeScript, Vite, Framer Motion
Backend	Node.js, Express
Automation	Playwright (Chromium via CDP)
State	localStorage (no database needed)

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How the Automation Works

SellStream uses Playwright to control a real Chrome browser on your machine. Instead of launching a separate browser window, it connects to your existing Chrome session over the Chrome DevTools Protocol (CDP) on port 9222. This means:

• Your existing logins (Facebook, Google, etc.) are already active — no credentials stored on a server
• Automation opens as a new tab in your current window, not a separate process
• Photos, titles, prices, and descriptions are filled in automatically

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Getting Started

Prerequisites

• Node.js 18+
• Google Chrome installed
• A Facebook account (for Marketplace automation)

1. Clone the repo

git clone https://github.com/YOUR_USERNAME/ACL26Hack.git
cd ACL26Hack

2. Install dependencies

cd backend
npm install
cd ../frontend
npm install

3. Run the demo

Double-click start-demo.bat (Windows) — this launches Chrome with CDP enabled and starts the backend.

Or manually:

# Terminal 1 — backend
cd backend
node server.js

# Terminal 2 — frontend
cd frontend
npm run dev

Then open http://localhost:5173 in your browser.

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Project Structure

ACL26Hack/
├── frontend/                 # React + Vite app
│   └── src/
│       ├── pages/            # Dashboard, Listings, Finances, Sign In
│       ├── components/       # Modals, platform icons, UI pieces
│       └── store/            # Global state (useStore, StoreProvider)
├── backend/                  # Express API
│   ├── server.js             # API routes
│   └── automation/
│       ├── facebook.js       # Facebook Marketplace automation
│       └── nextdoor.js       # Nextdoor automation
└── start-demo.bat            # One-click launcher (Windows)

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Platform Support

Platform	Status
Facebook Marketplace	✅ Full automation
Nextdoor	✅ Full automation (Google sign-in)
eBay	🔧 Mock (UI complete)
Craigslist	🔧 Mock (UI complete)

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Built At

ACL 2026 Hackathon