I have this as configuration of my Express server
app.use(app.router);
app.use(express.cookieParser());
app.use(express.session({ secret: \"keyboard cat\" }
First make sure , you have installed npm module named 'body-parser' by calling :
npm install body-parser --save
Then make sure you have included following lines before calling routes
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.json());