본문으로 건너뛰기

포트3000— Next.js / development HTTP

Next.js CLI의 기본 포트는 3000입니다. 다른 개발 서버도 사용할 수 있지만 Node.js와 React 자체가 공통 수신 포트를 정하지는 않습니다.

Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.

Configuration and troubleshooting

Next.js에서 next dev --port 3002 --hostname 127.0.0.1은 로컬 엔드포인트를 지정합니다. npm 스크립트를 사용할 때는 인수가 실제 명령에 전달되는지 확인하세요.

Important limitations

3002는 예시일 뿐 사용 가능한 포트임을 보장하지 않습니다. 개발 서버를 운영 서비스로 노출하지 마세요. 변경 후에는 콜백과 프록시 대상을 갱신하세요.

Read-only checks: run on the server host

Choose the commands for your OS. Check TCP and UDP separately. No result is not a lasting availability guarantee; inspect host and container separately.

Linux

sudo ss -ltnp 'sport = :3000'

macOS

sudo lsof -nP -iTCP:3000 -sTCP:LISTEN

Windows PowerShell

Get-NetTCPConnection -LocalPort 3000 -State Listen

Sources and review

Sources checked on:

This review covers the explanations and sources on this page, not your device or every community software entry below.

이 포트를 사용하는 소프트웨어 (29 개 소프트웨어)

Community software entries: links are references, not individual verification.

Node.js Development Server

Node.js is a runtime; the application chooses its listening port.

React Development Server

A React application uses the development port configured by its build tool or framework.

Next.js Development Server

The Next.js CLI defaults to 3000; change it with --port.

Express.js

Fast, minimalist web framework for Node.js

Koa.js

Next generation web framework for Node.js designed by Express team

Fastify

Fast and low overhead web framework for Node.js

Hapi.js

Rich framework for building applications and services in Node.js

Feathers.js

Web framework for real-time applications and REST APIs

Loopback

Highly extensible open-source Node.js and TypeScript framework

Total.js

Full-stack web application framework for Node.js

Micro

Asynchronous HTTP microservices

Polka

Minimal Node.js HTTP framework

Moleculer

Progressive Node.js microservices framework

Seneca

Node.js microservices toolkit

Tinyhttp

Modern Express alternative

Beego

Open-source, high-performance Go application framework

Buffalo (Alternative)

Alternative port for Buffalo framework

Grafana

Grafana data visualization platform port

Langflow

LangflowLLMApplicationBuildPort

Dify Frontend

DifyPort

React Native Metro

React Native Metro development server

Flutter Web Server

Flutter Web development server

NativeScript Development Server

NativeScript development server

Gatsby Development Server

Gatsby static site generator development server

Shopify Theme Development

ShopifyThemeDevelopmentServer

Medusa Commerce

MedusaOpen SourceE-commercePlatform

Saleor Commerce

Saleor GraphQLE-commercePlatform

Next.js Commerce

Next.js

AdGuard Home Default

AdGuard HomePort

사용 시 참고 사항

  • 포트 3000 사용 전에 다른 서비스가 점유하고 있지 않은지 확인해 주세요
  • 포트 충돌이 발생하면 다른 포트를 사용하거나 해당 포트를 점유한 서비스를 중지하는 것을 고려해 보세요

자주 묻는 질문

What is port 3000 used for?

Port 3000 sits in the Development category. This page lists the registered purpose and the software commonly associated with it; to see what is actually listening on a specific machine, check the process with ss/netstat.

Is port 3000 TCP or UDP?

The registered protocol on this page is TCP. The same number behaves independently on each protocol: TCP may be listening while UDP is idle, so check them separately.

How do I check if port 3000 is in use?

On Linux: sudo ss -tlnp 'sport = :3000' for an exact port match. On macOS: sudo lsof -nP -iTCP:3000 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 3000 -State Listen. A listener counts as confirmed only when you can see the bind address and process name; without root/admin you will not see other users' processes.

Is port 3000 secure? Should I open it in my firewall?

A port number has no inherent security — it depends on whether the listening service is correctly configured and whether it needs exposure at all. Keep loopback/internal-only services firewalled; where public access is required, pair it with source restrictions, VPN or authentication. The caution section on this page lists port-specific risks.

핵심 정보

포트
3000
프로토콜
TCP
카테고리
개발
사용 현황
29 개 소프트웨어에서 사용

도움이 필요하신가요?

잘못된 정보를 발견했거나 추가할 정보가 있다면 수정 내용을 제보해 주세요.

수정 사항 제보