React App 未连接到本地服务器

Question

I have my local express server running at port 3000, when I npm start my react app, it asks to Would you like to run the app on another port instead? Yes Would you like to run the app on another port instead? Yes but takes forever and doesn't take me anywhere. I tried to set port of my react app in package.json but then it's not responding to the server.

Thanks in advance

Answer 1

You can set your React app port in your package.json scripts:

replace your script

"start": "react-scripts start"

with

"start": "set PORT=8080 && react-scripts start"

Answer 2

If you have PORT in your env set it there

Should work with a different port value to stop conflicts.

Make sure your port can be specified with this line

app.set('port', process.env.PORT || 3000);

then set something in your env

PORT=8080

Answer 3

Change your port like this in your package.json file

    "scripts": {
        "start": "set PORT=3006 && react-scripts start"
    },

If you are using a .env file, I suggest you use @Joe Lloyd his answer. If not, my answer should do the trick.