Jupyter / Anaconda

Localhost 8888 Not Loading?

Port 8888 is the home of Jupyter Notebooks. If it asks for a token or refuses to connect, check below.

Go to http://localhost:8888 →
Kill Port 8888
npx kill-port 8888

Jupyter Notebook Troubleshooting

Data scientists often face issues where the notebook server starts but the browser doesn't open, or the port is busy.

1. Find the Login Token

If localhost:8888 asks for a password, check your terminal output. You will see a URL like:

http://localhost:8888/?token=3d9f...

2. Start Without Browser

If the browser fails to launch, start Jupyter manually:

jupyter notebook --no-browser

Developer Port Reference Guide

Frontend & Web
3000 React / Node / Default 3001 React Secondary
Backend & Infrastructure
5000 Flask / AirPlay 4000 Jekyll / Hexo
Database & Cache
3306 MySQL 5432 PostgreSQL
DevOps & Data Science
8888 Jupyter Notebook 9200 Elasticsearch 9090 Prometheus 15672 RabbitMQ UI 8500 Consul 127.0.0.1 Loopback IP