Node Js with NoSQL Database

Topics Covered

• Configuration
• Connect to MongoDB

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Configuration

1. Browse cloud.mongodb.com -> Build New Cluster -> Keep defaults (you can change cluster name if required) -> click Create Cluster

2. In Cluster -> Security tab ->

   • Database Access -> Make sure to have at-least one user -> add User that has Read and Write Access to any database
   • Network access -> IP White list -> Add your IP address to connect with cloud MongoDB

3. Add MongoDB driver: npm install --save mongodb

4. Within Cluster -> Connect -> Connect Your application -> Driver Version: Node.js 3.0 or later -> Copy URL

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Connect to MongoDB

• Following code connects to MongoDB. Use URL from Atlas (one retrieved in #4 of above section)

  const mongodb = require('mongodb');
  const MongoClient = mongodb.MongoClient;
  
  const mongoConnect = (callback) => {
   MongoClient
   .connect('mongodb+srv://test:[email protected]/test?retryWrites=true&w=majority',{
       useUnifiedTopology: true,
       useNewUrlParser: true,
   })
   .then(client => {
       console.log('connected to mongodb: ', client);
       callback(client);
   })
   .catch(error => {
       console.log('error connecting to mongodb: ', error);
       callback(error);
   });
  }
  
  module.exports = mongoConnect;

• Then in app.js, use MongoClient to connect with database

  const mongoConnect = require('./util/nosql_database');
  ...
  mongoConnect(client => {
     console.log('client status: ', client);
     app.listen(4200, 'localhost');
  });

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