[Web App/Node.js Express] JSON Revised

[app.js]

var users = ['choi', 'kim','park', 'lee', 'cho'];

app.param('from', function(req, res, next, from){
    req.from = parseInt(from, 10);
    next();
});

app.param('to', function(req, res, next, to){
    req.to = parseInt(to, 10);
    next();
});

app.get('/users/:from-:to', function(req, res){
    res.json(users.slice(req.from, req.to + 1));
});