How to expose localhost:8888 to the internet
Most guides assume port 3000. Jupyter defaults to 8888. Useful when you need a colleague to see a notebook UI remotely. This page is for 8888 specifically.
Jupyter defaults to 8888. Useful when you need a colleague to see a notebook UI remotely. The tunnel does not care what framework you run. It forwards HTTPS to whatever is bound on 8888.
Quick start
curl -fsSL https://get.ngsrv.com | bash
ngsrv token <YOUR_TOKEN>
ngsrv http 8888
You get a public URL like https://furry-otter-1842.tnl.ngsrv.com that routes to http://localhost:8888.
What usually runs on 8888
- Jupyter Notebook
- JupyterLab
Typical dev command: jupyter lab --port 8888
Install the CLI
# macOS (Homebrew)
brew install ngsrv/tap/ngsrv
# macOS / Linux
curl -fsSL https://get.ngsrv.com | bash
# Windows (PowerShell)
irm https://get.ngsrv.com/windows | iex
Sign up at ngsrv.com/register if you need a token. Free tier, no card.
Run the tunnel
With your server already up on port 8888:
ngsrv http 8888
Sample output:
forwarding https://furry-otter-1842.tnl.ngsrv.com -> http://localhost:8888
status online
Stable subdomain (optional)
Random names change when you restart. For webhooks or client previews, reserve one:
ngsrv http 8888 --subdomain notebook
# -> https://notebook.tnl.ngsrv.com
When it breaks
connection refused — Nothing is listening on 8888. Confirm with lsof -i :8888 (macOS/Linux) or netstat -ano | findstr :8888 (Windows).
401 invalid token — Re-run ngsrv token <YOUR_TOKEN> from the dashboard.
Tunnel drops — ngsrv reconnects on its own. Persistent drops usually mean VPN or proxy interference.