Why does the "TypeError: client.db is not a function" appear on Node.js and how do I fix it?

Question

I was minding my business until I stumble upon this TypeError. I tried my best to figure it out, but the codes won't work in my method.

const express = require("express");
const bodyParser = require("body-parser");
const mongoClient = require("mongodb").MongoClient;
const objectId = require("mongodb").ObjectID;
require("dotenv/config");

let app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended:true }));
app.get('/', (req, res) => {

app.listen(4000, () => {
console.log("It's connected to the server!");
mongoClient.connect(process.env.DB_CONNECTION, { useNewUrlParser:true, useUnifiedTopology: true }, (client, err) => {
    if (err) {
        throw error
    };
    const dB = client.db(process.env.DB_NAME); //Not a function, why?
    dB.collection("cookie");
    console.log(`Connected to "${process.env.DB_NAME}" !`);
});

});

I hope I get some good advice on how to tackle the problem properly. :)

Narigo · Accepted Answer · 2020-06-10 23:57:36Z

2

The callback for mongoClient.connect has the wrong order of arguments.

(client, err) => {...} should be (err, client) => {...}

Either it receives a real error or null, but any of them should not have a function called db on them.

answered Jun 10, 2020 at 23:57

Narigo

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