use nginx reverse proxy to open the interface, similar to the following:

server {
    listen      80;
    server_name domain.com;

    location /api {
        proxy_pass      http://open_service_url;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

you said "proxy forwarding server" and forwarded it yourself with nodejs. Don't you know what to do? No back-end project at least a web server, right? You can just use nginx as the web server and then proxy that interface, or just use the forwarding script you wrote. Or what do you mean?

node is also used online.
browser-> node-> api

if the development environment uses vue-cli, you must use webpack-dev-server, to write the proxy option directly in the configuration file. Please refer to the link: https://vuejs-templates.githu.

there are many ways. Node.js casually finds a code that serves as a service on the Internet, then starts on the command line, webpack is filled in directly in proxy, and the editor can also create a server. Just pick one and search it