Expose Backend Using Cloudflare Tunnel + PM2 (Free & Persistent)

[abhishek-nexgen-dev]

We need to expose our local Node.js + Express backend (with LangChain integration) to the public using a stable, long-running, and free solution.
The goal is to allow external users, collaborators, or client applications to access the AI backend without requiring local setup, VPN, or port forwarding.

---

✅ Chosen Solution

• Cloudflare Tunnel (cloudflared)
  Used for public HTTPS exposure of the local server, enabling secure and reliable access over the internet.

• PM2 Process Manager
  Runs both the backend server and the Cloudflare tunnel in the background, ensuring they stay up and restart automatically if needed.

🔧 Setup & Configuration Tasks

To expose the backend using Cloudflare Tunnel and manage processes with PM2, follow these steps:

1. Install and Configure Cloudflared CLI

• Download and install the cloudflared CLI from Cloudflare's official site.
• Authenticate and create your tunnel according to their documentation.

2. Update Project Scripts or Documentation

• Ensure your project scripts support starting both the backend and tunnel easily.
• Example tunnel command:

  cloudflared tunnel --url http://localhost:<PORT>

3. Use PM2 to Run Both Services

• Run your Node.js backend (e.g., server.js) with PM2:

pm2 start server.js --name backend

• Run the Cloudflare tunnel with PM2:

pm2 start "cloudflared tunnel --url http://localhost:<PORT>" --name tunnel

• Make sure the tunnel URL is displayed or logged on startup for easy reference.

4. Keep Services Running After Reboot

• Use PM2 startup script to launch services on system boot:

pm2 startup
pm2 save