Node.js Port 3000已经在使用但实际上并没有？ [英] Node.js Port 3000 already in use but it actually isn't?

问题描述

我一直在使用node.js项目几个星期，它一直很好用。通常我使用'npm start'来运行我的应用程序并在浏览器上的localhost，端口3000上查看它。

I have been working with a node.js project for a few weeks and it has been working great. Usually I use 'npm start' to run my app and view it in a browser at on localhost, port 3000.

今天，我在使用时开始出现以下错误npm start：

Today, I started to get the following error while using npm start:

Server started on port 3000                                                                                                                                                                                         
Port 3000 is already in use 

我检查了资源监视器，我没有在端口3000上运行其他进程。为什么我会得到这个错误信息？

I have checked the resource monitor and I have no other process running on port 3000. Why would I be getting this error message?

在我的app.js中，我有以下代码来设置端口......这是不正确的？它之前工作正常，所以我不确定我做错了什么。

In my app.js I have the following code to set the port...is this incorrect? It worked fine before so I'm not sure what I am doing wrong.

// Set Port
app.set('port', (process.env.PORT || 3000));
app.listen(app.get('port'), function() {
    console.log('Server started on port '+app.get('port'));
});

感谢您的帮助！

编辑：
我尝试运行netstat和TCPView来检查使用该端口的进程，但没有使用该端口。我也试过重启我的笔记本电脑，但我仍然得到同样的错误。

I have tried running netstat and TCPView to check what process is using the port, but there is nothing using that port. I also tried restarting my laptop but I still get the same error.

推荐答案

您可以搜索如何终止该过程。

You can search on how to kill that process.

对于 Linux / Mac 操作系统搜索（sudo）在终端中运行这个：

For Linux/Mac OS search (sudo) run this in the terminal:

$ lsof -i tcp:3000
$ kill -9 PID

在Windows上：

netstat -ano | findstr :3000
tskill typeyourPIDhere 

更改 tskill for taskkill in git bash

change tskill for taskkill in git bash

这篇关于Node.js Port 3000已经在使用但实际上并没有？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！