Connection refused on localhost - node.js

Question

I am trying to work on my nodejs and reactjs app at school but everytime I run the server, I get an error with
localhost:PORT/net::ERR_CONNECTION_REFUSED
Is the wifi refusing the connection on localhost?
PS: The react side renders correctly

Answer 1

If you're using WSL (linux on windows), restart its service LxssManager Servie (run services.msc) and try again.

Answer 2

Try changing the url from localhost to 127.0.0.1 . If it works, then it means your environment is not resolving localhost to 127.0.0.1
Or Try with changing the PORT Number

Answer 3

For those of you that the approved solution didn't work for (changing localhost to 127.0.0.1) I was able to fix this just by restarting my computer. Not sure what caused the issue but the day before today my app was working fine and then today I got hit with this error. Restarting fixed the issue.

Answer 4

In my case I have an error with require in setupProxy.js

Answer 5

In my case, deleting the node_modules and then reinstalling using npm install worked.

Answer 6

I was also facing this problem on mac m1 from last 2 days, so finally i ended fixing the issue by :-
Run 'npm start' from default shell(/bin/bash) on vs code.
You can also try to update the node version.
You may need to change the port for application only if some other application is running on default port(3000)

Answer 7

In my case, I resolved the issue using "npm start" command again in terminal of vs code and it works.

Answer 8

In my case I had made changes to the setupProxy.js that caused the problem. Try reverting back to something that is working, such as:
const { createProxyMiddleware } = require('http-proxy-middleware');
module.exports = function(app) {
app.use(
'/api',
createProxyMiddleware({
target: 'http://localhost:5000',
changeOrigin: true,
})
);
};

Answer 9

Rebooting the system (linux) worked for me. Consider rebooting first.

Answer 10

the problem of "localhost refused to connect." is occur because of command prompt that you closed so you must keep open your command prompt after hit "npm start" command till you work in "App.JS" file.
i'm sure this will work 100%.