Routing in Express.js - dynamic number of parameters - node.js

Question

I've a concept for create routing with multiple parameters when numbers of it are dynamic, for example:
/v2/ModuleName/Method/Method2/
In Express I want parse it as: Modules.v2.ModuleName.Method.Method2(). When will be just one method, this should be of course Modules.v2.ModuleName.Method(). It's possible to do that?

Answer 1

You can split pathname then lookup the method from your Modules object like this:
// fields = ['v2', 'ModuleName', 'Method', 'Method2']
var method = Modules;
fields.forEach(function (field) {
method = method[field];
})
// call method
console.log(method());
Full code:
var express = require('express'), url = require('url');
var app = express();
Modules = {
method: function () { return 'I am root'},
v2: {
method: function () { return 'I am v2';}
}
};
app.get('/callmethod/*', function (req, res) {
var path = url.parse(req.url).pathname;
// split and remove empty element;
path = path.split('/').filter(function (e) {
return e.length > 0;
});
// remove the first component 'callmethod'
path = path.slice(1);
// lookup method in Modules:
var method = Modules;
path.forEach(function (field) {
method = method[field];
})
console.log(method());
res.send(method());
});
app.listen(3000);
Test on browser:
http://example.com:3000/callmethod/method
"I am root"
http://example.com:3000/callmethod/v2/method
"I am v2"
PS: you can improve this app to support pass params to a method via url:
http://example.com:3000/callmethod/v2/method?param1=hello&param2=word