Node js can't connect to my database using mongoose

Question

I am trying to use use hyper terminal to connect to my mongodb database (created with mongoose) and when I use node app.js to try to connect to the database using hyper terminal, my terminal just freezes and return no response until I press ctrl c to exit and return to the previous line.

My mongoose code looks like the following:

const mongoose = require('mongoose');

mongoose.connect('mongodb://127.0.0.1:27017/fruitsDB');

Please note. I have already connected to the mongodb server by using mongodin the terminal and I have also cd to the directory of my folder where the app.js is located on my pc before running the node app.js on the terminal

screenshort of my terminal hyerterminal code screen

Please I need your help. Thank you

If you already connected to the db via terminal, I see no problem here. You terminal "did not freeze" Your code just dosnt generate any output. What did you expect to happen? — Marc
– Marc, Commented Apr 14, 2022 at 13:15
the mangoose command line 'mongoose.connect('mongodb://127.0.0.1:27017/fruitsDB')' is suppose to create a new database 'fruitsDB' into my mongodb database. running a code 'show dbs' in the command line is suppose to show that the database is among the existing database if the code works as you suggested, but nothing of such which means the code did not work in the first place. — Sam Ajayi
– Sam Ajayi, Commented Apr 14, 2022 at 14:25
Add event listener for "connect" & "error" and show if the are triggerd. Not sure if the db is only created when you do something in it, like crate collections/documents. Just because you specifiy in the connection string the database does not mean the database is created on a connection attempt. — Marc
– Marc, Commented Apr 14, 2022 at 14:47

clokam13 · Accepted Answer · 2022-04-14 16:09:29Z

1

I believe that your terminal is NOT frozen, it is just that there is no console output in your code. You are connecting to Mongoose and then doing nothing after that.

Here are some suggestions,

You can use a callback to check if the connection is connected,

mongoose.connect('mongodb://127.0.0.1:27017/fruitsDB').then(
  () => { 
     console.log("Connected to DB!");
 },
  err => { 
    console.log(err);
 }
);

Add a few event handlers to check if your connection is working,

mongoose.connection.on('open', function(){
  console.log("Connection to Mongo DB is open!");
});

If you want to check for errors during "connect", you can chain an error handler in catch block.

mongoose.connect('mongodb://localhost:27017/test').
  catch(error => console.log(error));

If you want to use Async/Await for the same error handling, then follow the below.

(async () => {
    try {
      await mongoose.connect('mongodb://localhost:27017/test');
      console.log("Successfully connected to Mongo DB");
    } catch (error) {
      console.log(error);
    }
})();

If you want to catch errors happening after the connection is connected to Mongo DB,

mongoose.connection.on('error', err => {
  console.log(error);
});

answered Apr 14, 2022 at 16:09

clokam13

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1 Comment

Sam Ajayi Over a year ago

Thank so much for this help. I figured this work exactly but it was nice how you simplified the whole thing. I really do appreciate.

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