How to create subdomain for user in node.js

Question

I\'d like to share some user information at username.domain.com at my application. Subdomain should be available after user create his account.

I have found nice module

Answer 1

As I mentioned in OP comments, using Nginx webserver in front of Node would be very good option, since this is a secure way to listen 80 port. You can also serve static files (scripts, styles, images, fonts, etc.) more efficiently, as well as have multiple sites within a single server, with Nginx.

As for your question, with Nginx, you can listen both example.com and all its subdomains, and then pass subdomain to Node as a custom request header (X-Subdomain).

example.com.conf:

server {
    listen          *:80;
    server_name     example.com   *.example.com;

    set $subdomain "";
    if ($host ~ ^(.*)\.example\.com$) {
        set $subdomain $1;
    }

    location / {
        proxy_pass          http://127.0.0.1:3000;
        proxy_set_header    X-Subdomain     $subdomain;
    }
}

app.js:

var express = require('express');
var app = express();

app.get('/', function(req, res) {
    res.end('Subdomain: ' + req.headers['x-subdomain']);
});

app.listen(3000);

This is a brief example of using Nginx and Node together. You can see more detailed example with explanation here.