node.jsmongodbcloudcloud9codesandbox

How to use MongoDB with codesandbox?

I have been following an Udemy course to learn mongodb, and since the tutor uses a cloud based ide (cloud9), I have also decided to use the same. However, since cloud9 now requires AWS account I thought of using CodeSandbox. But I can't figure out how to start Mongo server on it. After installing both Mongod and MongoDB, if I try to run the app.js, it gives me error:

    (node:1297) UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to server [localhost:27017] on firstconnect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]
    at Pool.<anonymous> (/sandbox/node_modules/mongodb/lib/core/topologies/server.js:433:11)
    at Pool.emit (events.js:198:13)
    at createConnection (/sandbox/node_modules/mongodb/lib/core/connection/pool.js:577:14)
    at connect (/sandbox/node_modules/mongodb/lib/core/connection/pool.js:1007:11)
    at makeConnection (/sandbox/node_modules/mongodb/lib/core/connection/connect.js:31:7)
    at callback (/sandbox/node_modules/mongodb/lib/core/connection/connect.js:247:5)
    at Socket.err (/sandbox/node_modules/mongodb/lib/core/connection/connect.js:276:7)
    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)
(node:1297) UnhandledPromiseRejectionWarning: Unhandled promise rejection. Thiserror originated either by throwing inside of an async function without a catchblock, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:1297) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

If I try to run mongod, it says 

mongod: command not found

This is my app.js

var express = require("express");
var app = express();
var bodyParser = require("body-parser");
var mongoose = require("mongoose");

mongoose.connect("mongodb://localhost/yelp_camp");

I have tried installing mongo and mongod using codesandbox's UI , using terminal (npm install), and doing what cloud9's docs say (I know it should not work but I can't find any Codesandbox documentation)

Is it possible to do this in codesandbox or will I have to use MongoAtlas? Thanks in advance!

Solution

  • I think there's no database hosting on CodeSandbox, so you should use an external service.

    Some services you can use:

    MLab example

    1. Set up a database at MLab
    2. Copy and paste the connection string

    A simple example function would be:

    let initMongo = async () => {
  try {
    await mongoose.connect(
      "mongodb://<dbuser>:<dbpassword>@ds123456.mlab.com:49878/testdatabase",
      {
        useNewUrlParser: true,
        useUnifiedTopology: true
      }
    );
    return console.log("Database connected!");
  } catch (e) {
    return console.log("Database error!", e.message);
  }
};

    Here's the documentation of CodeSandbox.