How to use MongoDB with codesandbox? - node.js

Question

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!

Answer 1

I think there's no database hosting on CodeSandbox, so you should use an external service.
Some services you can use:
MLab (Free plan)
ObjectRocket (Free trial)
Compose (Free trial)
MongoAtlas
MLab example
Set up a database at MLab
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.

Answer 2

CodeSandbox has a starter for connecting to hosted MongoDB like Atlas - see https://codesandbox.io/s/mongodb-database-example-starter-v3ker