I just have the same issue and got it work by adding “next”. I use routers so maybe you have same issue as mine? Without next, i got error about no render engine…weird

var express = require('express');
var router = express.Router();
var debug = require('debug')('node_blog:server');

/* GET home page. */
router.get("https://stackoverflow.com/", function(req, res, next) {
  debug("index debug");
  res.render('index.html', { title: 'Express' });
});

router.post("https://stackoverflow.com/", function (req, res, next) {
    //var pass = req.body("password");
    //var loginx = req.body("login");
    //res.render('index.html', { title: 'Express' });
    res.redirect("https://stackoverflow.com/users")
    next
});

module.exports = router;