nodemon app crashed waiting for file changes before starting

Question

$ npm start

server@1.0.0 start nodemon index.js

[nodemon] 2.0.19 [nodemon] to restart at any time, enter rs [nodemon] watching path(s): . [nodemon] watching extensions: js,mjs,JSON [nodemon] starting node index.js D:\React\authInMern\server\index.js:8 connection(); ^

TypeError: connection is not a function at Object. (D:\React\authInMern\server\index.js:8:1) at Module._compile (node:internal/modules/cjs/loader:1126:14) at Object.Module._extensions..js (node:inter enter code here nal/modules/cjs/loader:1180:10) at Module.load (node:internal/modules/cjs/loader:1004:32) at Function.Module._load (node:internal/modules/cjs/loader:839:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) at node:internal/main/run_main_module:17:47 [nodemon] app crashed - waiting for file changes before starting...

index.js

require('dotenv').config();
const express = require("express");
const app = express();
const cors = require("cors");
const { connection } = require("./db");

// database connection
connection();

// Middlewares
app.use(express.json())
app.use(cors());

const port = process.env.PORT || 8080;`enter code here`
app.listen(port, () => console.log(`Listening on port $(port)...`)); 

db.js

const mongoose = require("mongoose");

module.exports = () => {
    const connectionParams = {
        useNewUrlParser: true,
        useUnifiedTopology: true,
    };
    try {
       mongoose.connect(process.env.DB, connectionParams);
       console.log("Connected to database successfully")
    } catch (error) {
        console.log(error);
        console.log("could not connect to database");
        
    }
};

Answer 1

Do it this way, if you want the connection function to be destructured

const mongoose = require("mongoose");

const connection = () => {
    const connectionParams = {
        useNewUrlParser: true,
        useUnifiedTopology: true,
    };
    try {
       mongoose.connect(process.env.DB, connectionParams);
       console.log("Connected to database successfully")
    } catch (error) {
        console.log(error);
        console.log("could not connect to database");
        
    }
};

module.exports = { connection }