How do i fix "TypeError: req.next is not a function" error?

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I am working on a project and i keep getting this error, and i have tried fixing it but i can't? I understand it but don't know how to fix it.

Here is the err:


events.js:292
      throw er; // Unhandled 'error' event
      ^

TypeError: req.next is not a function
    at done (C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\express\lib\response.js:1007:25)
    at tryRender (C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\express\lib\application.js:642:5)
    at Function.render (C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\express\lib\application.js:592:3)
    at ServerResponse.render (C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\express\lib\response.js:1012:7)
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\main.js:48:25
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\mongoose\lib\model.js:4866:16
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\mongoose\lib\model.js:4866:16
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\mongoose\lib\helpers\promiseOrCallback.js:24:16
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\mongoose\lib\model.js:4889:21
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\mongoose\lib\query.js:4400:11
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\kareem\index.js:136:16
    at processTicksAndRejections (internal/process/task_queues.js:79:11)
Emitted 'error' event on Function instance at:
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\mongoose\lib\model.js:4868:13
    at C:\Users\Children\Desktop\Web Projects\App Line Planner\node_modules\mongoose\lib\helpers\promiseOrCallback.js:24:16
    [... lines matching original stack trace ...]
    at processTicksAndRejections (internal/process/task_queues.js:79:11)

And from looking at the error i am pretty sure that the error is in this function:

app.get('/', function (req, res) {
    if (namee == "") {
        res.redirect('/login');
    } else {
        Item.find({ name: namee }, function (err, foundItemList) {
            if (err) {
                console.log(err);
            } if (foundItemList) {
                console.log(namee);
                console.log("Found ITems: " + foundItemList);
                for (var i = 0; i < foundItemList.length; i++) {
                    res.render('main', { item: foundItemList, foundItems: foundItemList[i].initem });
                }
            }
        });
    }
});

And here is the full code:

const express = require('express');
const bodyParser = require('body-parser');
const ejs = require('ejs');
const mongoose = require('mongoose');

mongoose.connect("mongodb://localhost:27017/appline", { useUnifiedTopology: true }, { useNewUrlParser: true });

const itemSchema = {
    name: String,
    initem: Array,
    text: String,
    tab: Number
}

const Item = mongoose.model("Item", itemSchema);

const app = express();
app.set('view engine', 'ejs');
app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.static('public'));

const items = [];
const tabs = [];

var namee = "";
var tabb = 0;

app.get('/login', function (req, res) {
    res.render('login');
});

app.post('/login', function (req, res) {
    namee = req.body.name;
    res.redirect('/');
})

app.get('/', function (req, res) {
    if (namee == "") {
        res.redirect('/login');
    } else {
        Item.find({ name: namee }, function (err, foundItemList) {
            if (err) {
                console.log(err);
            } if (foundItemList) {
                console.log(namee);
                console.log("Found ITems: " + foundItemList);
                for (var i = 0; i < foundItemList.length; i++) {
                    res.render('main', { item: foundItemList, foundItems: foundItemList[i].initem });
                }
            }
        });
    }
});

app.post('/addinitem', function (req, res) {

    tabb += 1;

    tex = req.body.addtoitem;

    const item2 = new Item({
        name: namee,
        initem: [],
        text: tex,
        tab: tabb
    });

    Item.find({ name: namee }, function (err, foundITems) {
        if (err) {
            console.log(err);
        } else if (foundITems) {
            foundITems.initem.push(item2);
            foundITems.save(function () {
                res.redirect('/');
            });
        }
    });

});

app.post('/add', function (req, res) {
    const item = req.body.newItem;
    console.log(item);
    items.push(item);
    const item1 = new Item({
        name: namee,
        initem: [],
        text: item
    });
    item1.save();
    console.log(item1);
    res.redirect('/');
});

app.listen(3000, function () {
    console.log('Server started on port 3000.');
});
mongoose express node.js javascript
1 Answers

The reason for your error could be that you're using res.render multiple times in the for loop, so you need to save those items that you want to show into an object, and pass it to the options in the render function.

Have a look at this code:

app.get('/', function (req, res) {
    var data = []
    if (namee == "") {
        return res.redirect('/login');
    } else {
        Item.find({ name: namee }, function (err, foundItemList) {
            if (err) {
                console.log(err);
            } if (foundItemList) {
                console.log(namee);
                console.log("Found ITems: " + foundItemList);
                for (var i = 0; i < foundItemList.length; i++) {
                    let obj = {}
                    obj["item"] = foundItemList[i] // Look at this
                    obj["itemDesc"] = foundItemList[i].initem
                    data.append(obj)
                }
            }
        });
    }
    return res.render('main', { items: data }); // And then you can pass it like a array and you will enumerate it into the template engine
});

Admin1
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