.env 文件未定义使用 require('dotenv').config();

Question

Having trouble with getting dotenv to pick up my.env file

Here is my file structure:

├── app.js
├── node_modules
│   └── ...
├── package.json
├── routes
│   └── index.js
└── start.js
│   
└── .env 

And here is my start.js:

require('dotenv').config();
console.log(process.env.MONGO_URI);
const mongoose = require('mongoose');


mongoose.connect(process.env.DATABASE, { useMongoClient: true });
mongoose.Promise = global.Promise;
mongoose.connection
  .on('connected', () => {
    console.log(`Mongoose connection open on ${process.env.DATABASE}`);
  })
  .on('error', (err) => {
    console.log(`Connection error: ${err.message}`);
  });

inside my.env is as follows:

mongodb+srv://username:password@livewelldb-aqoul.mongodb.net/test?retryWrites=true&w=majority

Unfortunately, when running my node.js app I get the following error:

C:\Users\user\Desktop\project\node_modules\mongoose\lib\connection.js:520
    throw new MongooseError('The `uri` parameter to `openUri()` must be a ' +
    ^
MongooseError: The `uri` parameter to `openUri()` must be a string, got "undefined". Make sure the first parameter to `mongoose.connect()` or `mongoose.createConnection()` is a string.

this is happening because dotenv does not seem to be able to find my.env file for some reason. when I run console.log(process.env.MONGO_URI); I get undefined.

No idea why. Most people with this issue have one of the following problems:

• they don't run their program from the root directory
• their.env is not in their root directory
• their.env is named incorrectly, eg "config.env"
• their.env is formatted in something other than UTF-8

I do not have any of these problems. I'm not sure what could be causing it.

Any ideas?

Answer 1

specify your.dotenv file name in the package upon loading the app

require('dotenv').config({path: './.env'})

Answer 2

Please check your .dotenv file name.

require('dotenv').config({path:'relative/path/to/your/.env'})