This is a warning that will go away once Express updates to use Connect 3.0 – as a temporary fix, follow the instructions at the top of https://github.com/senchalabs/connect/wiki/Connect-3.0. Specifically, find this line in your app:
app.use(express.bodyParser());
And replace it with the following (this is what bodyParser will be in 3.0):
app.use(express.json());
app.use(express.urlencoded());