Using the query Middleware

One of the most useful and simple middleware components is the query middleware. The query middleware converts a query string from a URL into a JavaScript object and stores it as the query property on the Request object. As of Express 4.x, the functionality exists within built-in request parser without the need for additional middleware.

The following code snippet shows the basics of utilizing the query middleware:

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var express = require('express'),
var app = express();
app.get('/', function(req, res) {
  var id= req.query.id;
  var score = req.query.score;
  console.log(JSON.stringify(req.query));
  res.send("done");
});

The query string for the request would look like ?id=10&score=95. Notice that JSON.stringify can be called on req.query because it is a JavaScript object.