I’m new to Node and ExpressJs development, however, I cannot import a module router created by me as an exercise.
It gives me this error:
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TypeError: Router.use () requires a middleware function but got a string
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at Function.use
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I have already tried the module.exports solution, but it doesn’t work. The initialize function also fails.
Here are the versions I am working with:
Node version: v10.19.0
Express version: 4.17.2
Index.js
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const express = require('express');
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const app = express();
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const ProgettoRouting = require("./routing/ProgettoRouting");
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app.use("view engine","jade");
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app.use(express.static("public"));
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//Codifica dati json con questo middlware senza uso
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//del pacchetto npm Body Parser
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app.use(express.json());
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//Con questo milldelware Importiamo il Router Dati
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//dove risiedono le funzionalità del progetto
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app.use('/route', ProgettoRouting);
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//app.use(app.ProgettoRouting);
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//ProgettoRouting.initialize(app);
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app.listen(3000, () => {console.log("Server in ascolto sulla porta 3000")});
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ProgettoRouting.js
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const express = require('express');
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const router = express.Router();
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router.post("/",(res,req) => {
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let firstName = req.body.nome;
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let lastName = req.body.cognome;
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let message = {nome: firstName, cognome: lastName};
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res.render("index",message);
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});
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module.exports = router;
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Answer
You need to use
app.set("view engine","jade");
instead of
app.use("view engine","jade");
as you’re intending to set the view-engine
property to jade
, not setting up a middleware.