Instalé express-handlebars y probé esto
const express = require("express"); const exphbs = require('express-handlebars'); const app = express(); app.engine('.hbs', engine({defaultLayout: 'main', extname: '.hbs'})); app.set('view engine', '.hbs');y obtengo ReferenceError: el motor no está definido
cambié de
app.engine('.hbs', engine({defaultLayout: 'main', extname: '.hbs'}));a
app.engine('.hbs', exphbs.engine({defaultLayout: 'main', extname: '.hbs'}));Y funcionó