Connection refused error

MongoDB for Academia
#1

Okay, where do I start. About five years ago I attended a Coding Bootcamp. My memory is fuzzy but I think I got some MongoJS applications to work. I’m coming back to it now, trying to practice, but when I try to start an old program I get this error:

Database Error: MongoServerSelectionError: C ::1:27017
    at Timeout._onTimeout (C:\Users\Dennis\Documents\MongoTest\node_modules\mongodb\lib\core\sdam\topology.js:438:30)
    at listOnTimeout (node:internal/timers:564:17)
    at process.processTimers (node:internal/timers:507:7) {
  reason: TopologyDescription {
    type: 'Single',
    setName: null,
    maxSetVersion: null,
    maxElectionId: null,
    servers: Map(1) { 'localhost:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    compatibilityError: null,
    logicalSessionTimeoutMinutes: null,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    commonWireVersion: null
  }
}
MongoServerSelectionError: connect ECONNREFUSED ::1:27017
    at Timeout._onTimeout (C:\Users\Dennis\Documents\MongoTest\node_modules\mongodb\lib\core\sdam\topology.js:438:30)
    at listOnTimeout (node:internal/timers:564:17)
    at process.processTimers (node:internal/timers:507:7) {
  reason: TopologyDescription {
    type: 'Single',
    setName: null,
    maxSetVersion: null,
    maxElectionId: null,
    servers: Map(1) { 'localhost:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    compatibilityError: null,
    logicalSessionTimeoutMinutes: null,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    commonWireVersion: null
  }
}

They say something like I have to update my ip address to 127.0.0.1 but how on Earth do I do that? I’ve tried the bind_ip command in mongod but that doesn’t work.

They say I’m supposed to modify this in mongod.cfg but I don’t have one anywhere in my bin.

I’m not Mongo expert but I’ve been Googling like crazy trying to figure this out. I need specifics. I just want to get a simple MongoJS program running.

#2

Replace localhost with 127.0.0.1 in your code

#3

Where? This is the sum total of my code:

// Dependencies
var express = require("express");
var mongojs = require("mongojs");

// Initialize Express
var app = express();

// Database configuration
// Save the URL of our database as well as the name of our collection
var databaseUrl = "zoo";
var collections = ["animals"];

// Use mongojs to hook the database to the db variable
var db = mongojs(databaseUrl, collections);

// This makes sure that any errors are logged if mongodb runs into an issue
db.on("error", function(error) {
  console.log("Database Error:", error);
});

// Routes
// 1. At the root path, send a simple hello world message to the browser
app.get("/", function(req, res) {
  res.send("Hello world");
});

// 2. At the "/all" path, display every entry in the animals collection
app.get("/all", function(req, res) {
  // Query: In our database, go to the animals collection, then "find" everything
  db.animals.find({}, function(err, found) {
    // Log any errors if the server encounters one
    if (err) {
      console.log(err);
    }
    // Otherwise, send the result of this query to the browser
    else {
      res.json(found);
    }
  });
});

// 3. At the "/name" path, display every entry in the animals collection, sorted by name
app.get("/name", function(req, res) {
  // Query: In our database, go to the animals collection, then "find" everything,
  // but this time, sort it by name (1 means ascending order)
  db.animals.find().sort({ name: 1 }, function(err, found) {
    // Log any errors if the server encounters one
    if (err) {
      console.log(err);
    }
    // Otherwise, send the result of this query to the browser
    else {
      res.json(found);
    }
  });
});

// 4. At the "/weight" path, display every entry in the animals collection, sorted by weight
app.get("/weight", function(req, res) {
  // Query: In our database, go to the animals collection, then "find" everything,
  // but this time, sort it by weight (-1 means descending order)
  db.animals.find().sort({ weight: -1 }, function(err, found) {
    // Log any errors if the server encounters one
    if (err) {
      console.log(err);
    }
    // Otherwise, send the result of this query to the browser
    else {
      res.json(found);
    }
  });
});

// Set the app to listen on port 3000
app.listen(3000, function() {
  console.log("App running on port 3000!");
});
#4

How do you activate your runtime environment?
Where is uri/mongodb connect string defined.You must be having an env file or node.js,app js etc
Check those files

#5

I have a server.js file, a node_modules folder, a package.json file, and a package-lock.json file. I activate my runtime environment by typing mongod and pressing enter, then opening another window and typing "node server.js.