Question 116326 in Mongodb Question posted in
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uri is returning undefined. Mongodb connection is not been established

enter image description here I need to know what’s the problem. I am not getting the message on console for establishment of Mongodb database connection.

Here is a link to the error picture. https://drive.google.com/file/d/14cdAgAjfVX6R7pXND-FbjbK_3r-A3F-J/view?usp=share_link

server.js file

const express = require('express');
const cors = require('cors');
const mongoose = require('mongoose');

require('dotenv').config();

const app = express();
const port = process.env.port || 5000;

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

// debugger
var uri; // Define outside
if(process.env.ATLAS_URI){
  uri = process.env.ATLAS_URI; // Assign inside the block
  }
  
mongoose.connect(uri, { useNewUrlParser: true, useCreateIndex: true}
);

const connection = mongoose.connection;
connection.once('open', () => {
    console.log("MongoDB database connection established successfully");
})

const exercisesRouter = require('./routes/exercises');
const usersRouter = require('./routes/users');

app.use('/exercises', exercisesRouter);
app.use('/users', usersRouter);

app.listen(port, ()=> {
    console.log(`Server is running on port: ${port}`);
});

.env file

ATLAS_URI = mongodb+srv://tripsy25:Mongo@[email protected]/?retryWrites=true&w=majority

I tried to debug the code and found that uri was coming as undefined. Do I need to convert the password in ATLAS_URI to some other format?

Tags:

3

Answers


  1. 0

    The .env file must be located in the root folder of your project. And you should run the project from the root folder. Therefore:

    Example 1

    server.js
.env

    Run it with node ./server.js

    Example 2

    src
 |-server.js
.env

    Run it with node ./src/server.js

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  2. 0

    You did one mistake in .env file

    you did

     ATLAS_URI = mongodb+srv://tripsy25:Mongo@[email protected]/?retryWrites=true&w=majority

    But you have to use url of atlas as an string

    ATLAS_URI = "mongodb+srv://tripsy25:Mongo@[email protected]/?retryWrites=true&w=majority"
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  3. 0

    The .env file must be located on the root folder and you must include it in the file where ever you need it at the very top.
    and a few changings you just need to do and the things are good to go.

    require('dotenv').config();
const express = require('express');
const cors = require('cors');
const mongoose = require('mongoose');

mongoose.set('useNewUrlParser', true);
mongoose.set('useFindAndModify', false);
mongoose.set('useCreateIndex', true);
mongoose.set('useUnifiedTopology', true);



const app = express();
const port = process.env.port || 5000;

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



mongoose.connect(process.env.ATLAS_URI)
  .then(() => {
    console.log("DB connection successful")
    app.listen(port, () => {
      console.log(`app listening on port ${port}`);
    })
  })
  .catch((err) => {
    console.log(err)
  })

const exercisesRouter = require('./routes/exercises');
const usersRouter = require('./routes/users');

app.use('/exercises', exercisesRouter);
app.use('/users', usersRouter);

    I am not getting why you just create a var for ATLAS_URI. Just keep the code simple and neat and clean.

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