如何正确连接到 mongodb.atlas？ Mongo网络错误

Question

I am learning how to use MongoDB with node.js, so I am making a restful-API as practice.

But I keep getting "MongoNetworkError: getaddrinfo ENOTFOUND" whenever I try to connect to atlas for mongo.

My code at server.js :

// call the packages
var bodyParser = require('body-parser');
var Bear = require('./app/models/bear');
var mongoose = require('mongoose');

var express = require('express');
var app = express();

const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb://<userName>:<pasword>@cluster0-<someCharacters>.mongodb.net/test?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect( err => {
  console.log(err);
  //const collection = client.db("test").collection("devices");
  client.close();
});

/*rest of the code is commented out*/
...

It logs the following error:

{ MongoNetworkError: failed to connect to server [cluster0-<someCharacters>.mongodb.net:27017] on first connect [MongoNetworkError: getaddrinfo ENOTFOUND cluster0-<someCharacters>.mongodb.net cluster0-<someCharacters>.mongodb.net:27017]
at Pool.<anonymous> (/app/node_modules/mongodb-core/lib/topologies/server.js:431:11)
at Pool.emit (events.js:198:13)
at connect (/app/node_modules/mongodb-core/lib/connection/pool.js:557:14)
at makeConnection (/app/node_modules/mongodb-core/lib/connection/connect.js:39:11)
at callback (/app/node_modules/mongodb-core/lib/connection/connect.js:261:5)
at Socket.err (/app/node_modules/mongodb-core/lib/connection/connect.js:286:7)
at Object.onceWrapper (events.js:286:20)
at Socket.emit (events.js:198:13)
at emitErrorNT (internal/streams/destroy.js:91:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
name: 'MongoNetworkError',
errorLabels: [ 'TransientTransactionError' ],
[Symbol(mongoErrorContextSymbol)]: {} }

notes:

• <userName> , <pasword> , <someCharacters> represent characters accordingly
• I get the same results both in my laptop and in Heroku
• If set up mongodb localy it works fine on localhost
• I got the conection string directly from cloud.mongodb.com

what might I be doing wrong?

Answer 1

u installed mongoose but you are trying to connect with mongodb package. since you installed mongoose

const mongoUri="your connection string here"
mongoose.connect(mongoUri,{useNewUrlParser:true})
.catch((e)=>{
    console.log(e.message)
    process.exit(1)
})
.then(()=>{
    console.log("connected to Mongo Atlas")
})

mongoose.connect return promise. if there is an error, connection will be rejected, it will log the error and then exit the process. if connection is success, that means promise is resolved, so it will connect and then will log the "connected to Mongo Atlas"

However i suggest you to check your connection string. it should have "+srv", something like this

  mongodb+srv://