javascript - How is this passportjs code working? -

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i begineer in nodejs. reading passport.js codes , bit confused code

app.post('/login',  passport.authenticate('local'),  function(req, res) {  // if function gets called, authentication successful.  // `req.user` contains authenticated user.  res.redirect('/users/' + req.user.username);  });

i comparing above codes codes below

app.get('/', function (req, res) {  res.send('hello world')  })

app.post() has 3 arguments. seeing 2 arguments cannot understand 1 additional argument passport.authenticate('local'), can me


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