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💡 Pro Tip: Port 8081 is commonly used as an alternative when port 8080 is already in use. Many developers configure their applications to automatically fall back to 8081.

About Port 8081

Port 8081 is commonly used as:

Backup port when 8080 is occupied
Second instance of Spring Boot applications
Alternative Tomcat server port
Development server for microservices
Load balancer backend servers

How to Configure Port 8081

Spring Boot:
server.port=8081 (application.properties)
java -jar app.jar --server.port=8081

Tomcat:
Edit server.xml Connector port to 8081
<Connector port="8081" protocol="HTTP/1.1">

Node.js/Express:
const PORT = process.env.PORT || 8081;
PORT=8081 npm start

Check what's using 8081:
lsof -i :8081 (Mac/Linux)
netstat -ano | findstr :8081 (Windows)

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Did you mean to visit localhost:8081?

About Port 8081

How to Configure Port 8081

Related Alternative Ports