Redirects in infinite loop if a body parser is not set up for express

Minor, but should be documented: when defining the callback route:

let app = express()
app.get('/login', passport.authenticate('saml', { failureRedirect: '/' }), (req, res) => res.redirect('/'))
app.post('/callback', passport.authenticate('saml', { failureRedirect: '/' }), (req, res) => res.redirect('/'))

There needs to be middleware that supports body parsing, otherwise (in my case) it starts redirecting between my IdP and my app indefinitely.

[PhilippSpo]

I also had the same issue. Adding the bodyParser finally resolved it. 😅

const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({ extended: false }));

[mrchief]

Wasted days chasing this infinite loop issue. Many thanks to OP for creating this issue. There is no mention of it in documentation. 😞