How to send user to another page after login (node js)

I have the following code that checks to see if a user exists in a database...

router.post('/', function (req, res) {

    User.findOne({
        username: req.body.log_username,
        password: req.body.log_password
    }, function (err, docs) {
        if (docs.length !== 0) {
            console.log("user exists");

        }
        else {
            console.log("no exist");
        }
    });

});

I have a home page that I want to send the user to if the login was a success. What should I put in the if statement to send the use to another page, in this case, home.js. home.js has the following code in it...

var express = require('express');
var router = express.Router();

router.get('/', function (req, res) {
    res.render('home', { title: 'Express' });
});

module.exports = router;