use dynamic subdomains with nodejs - node.js

Question

hello i am new to Nodejs. I want to use dynamic subdomains to access my API and through subdomain prefix I can manage my API data.
Suppose I gave domain like domain:3000 and sub-domain could be a.domain:3000 or b.domain:3000 or anything prefixed to domain:3000.
I used wildcard-domains. but still unable to undersatnd the flow and how to use it and allow organisation listed in DB (Consider prefix as organisation name).
I have used following code:
var wildcardSubdomains = require('wildcard-subdomains')
var checkUser = subdomain('*.localhost:3000', function(req, res,
next) {
console.log(req.session.user.valid);
if(!req.session.user.valid) {
return res.send('Permission denied.');
}
next();
});
app.use(checkUser);
I am also using angularjs and using ui.router to change my states or urls.

Answer 1

I used this module
npm i vhost --save
Here you can see information
http://expressjs.com/en/resources/middleware/vhost.html
wildcard-subdomains
As you can see in https://www.npmjs.com/package/wildcard-subdomains
app.use(wildcardSubdomains({
namespace: 's', // __NAMESPACE_FROM_WILDCARD_CONFIG__
www: 'false',
}))
If you follow, example, link foo.localhost:3000 Express will process this middleware
app.get('/s/foo/', function(req, res){
res.send("Meow!")
})
That is to say
app.get('/__NAMESPACE_FROM_WILDCARD_CONFIG__/__SUBDOMAIN__/', function(req, res){
res.send("Meow!")
})
You can try to write app.get('/s/:subdomain', ...