Express form parsing not working

I've been using Express.js and the body-parser module for parsing a form to the server. However, when the content is received, res.body it just shows up as an empty object.

app.js:

var express = require("express");
var app = express();
var bp = require("body-parser");

app.set('views', __dirname + '/views');

app.use(bp.json());
app.use(express.static(__dirname + '/public'));

app.get('/', function (req, res) {
  res.render('index.jade');
});

app.post('/', function (req, res) {
  console.log(req.body);
});

app.listen(process.env.PORT || 5000);

The form (in Jade):

form(method="post", action="/", enctype="application/json")
    input(type="text", name="name", placeholder="input your name")

Why is this so and how can it be fixed?