var url = require('url');
var querystring = require('querystring');
 
var testUrl = "http://localhost:9090/calculator?oper=add&n1=10&n2=20";
 
var parsedUrl = url.parse(testUrl); //would be url.parse(req.url)
var parsedQuery = querystring.parse(parsedUrl.query);
 
console.log(parsedQuery.oper, parsedQuery.n1, parsedQuery.n2);
 
console.log('---------------------------------------------');
 
//Iterate the parsedQuery like an array:
var parsedQueryKeys = Object.keys(parsedQuery);
parsedQueryKeys.forEach(function(key) {
    console.log( key, parsedQuery[key] );
});
 

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