How to use nginx to switch from port 3000 to port 80?

As I was following and I config my /etc/nginx/sites-available/default to this

server {
    listen 80;
    listen [::]:80;
    root /var/www/html;
    location / {
        try_files $uri $uri/ =404;

However, when I run pm2 start app.js the website still runs on I want to get rid of :3000. How can I do that?

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Hi there @zhuxingyuan123,

What you need to do is configure Nginx as a reverse proxy, you can follow the steps on how to do that here:

Hope that this helps! Regards, Bobby