Did you go the website that the warning told you to go to?
https://github.com/senchalabs/connect/wiki/Connect-3.0
It explains in detail what is going on, and how to fix it.
Note that if you're currently using connect.bodyParser(), you will still get the deprecation >warning for multipart. For now, you can ignore it since you should only see the warning message once at start up. If you want to avoid any warning messages, do this instead (which is what connect.bodyParser() will be in 3.0):
app.use(connect.urlencoded())
app.use(connect.json())
I was using express.bodyParser(), so in my solution I used
app.use(express.urlencoded())
app.use(express.json())
and it worked fine. No more warnings.