Localhost Ports Hub Complete directory of development ports
Master every development port in one place. From React's localhost:3000 to Elasticsearch's 9200, find solutions, comparisons, and troubleshooting guides for your development workflow.
localhost:3000
Primary port for React, Next.js, and modern JavaScript frameworks. The go-to for frontend development.
localhost:5000
Flask, Django, and Python backend services. Also used by Create React App dev server.
localhost:8080
Java applications, Tomcat, Spring Boot, and common proxy/alternative HTTP port.
localhost:9200
Elasticsearch, Logstash, and search database services. Essential for full-text search.
localhost:9000
Elasticsearch, Logstash, and search database services. Essential for full-text search.
Port Quick Reference
:3000, :1234, :5173
:5000, :8000
:8080, :8443
:9200, :27017, :5432
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Request Port GuideMastering Localhost Ports
Why Ports Matter
Localhost ports are the gateways to your development environment. Each port number serves specific frameworks, databases, and services. Understanding which port to use for React (3000), Flask (5000), or Elasticsearch (9200) streamlines your workflow and minimizes conflicts.
- Avoid port conflicts between services
- Quickly identify services by port number
Common Port Conflicts
The most frequent localhost issues stem from port conflicts. When multiple services attempt to use the same port, you'll encounter "port already in use" errors. Our troubleshooting guides provide step-by-step solutions for every scenario.
$ netstat -ano | findstr :3000
# Find and kill process using port 3000