Failed to lookup view "index.ejs" in views directory

You need to set your view directory and your viewengine before requesting any of your view files.

Hence you need to add the below lines, before your app.get

app.set('views', './views');
app.set('view engine', 'ejs');

And your res.render('index.ejs'); should be changed as,

res.render('index');

Hope this helps!