How do I setup a SSL certificate for an express.js server?

Before, in an older version of express, I could do this:

express.createServer({key:'keyFile', cert:'certFile'});

However, in newer versions of express this no longer works:

var app = express();

Should I call app.use() to set the certs? If so how?

Try with the below solution

See the Express docs as well as the Node docs for https.createServer (which is what express recommends to use):

var privateKey = fs.readFileSync( 'privatekey.pem' );
var certificate = fs.readFileSync( 'certificate.pem' );
https.createServer({
    key: privateKey,
    cert: certificate
}, app).listen(port);

Other options for createServer are at: http://nodejs.org/api/tls.html#tls_tls_createserver_options_secureconnectionlistener

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