added mongo db config and handled uncaught error

server.js

@@ -25,10 +25,20 @@ process.on('SIGINT', () => {
  process.exit(1);
 });
 
+// uncaught promise rejection
 process.on('unhandledRejection', (reason, p) =>
  error('Unhandled Rejection at: Promise ', p, reason)
 );
 
+// uncaught exception 
+process.on('uncaughtException', (err, origin) => {
+ error(
+ process.stderr.fd,
+ `Caught exception: ${err}\n` +
+ `Exception origin: ${origin}`);
+});
+
+
 let server;
 
 // checking the environment of the node 

src/config/db.mongo.js

@@ -0,0 +1,34 @@
+const mongoose = require('mongoose');
+const chalk = require('chalk');
+const {
+ log,
+ error,
+ info
+} = require('../utils/logging');
+
+function connectDb() {
+ mongoose.connect(process.env.MONGO_URI, {
+ useNewUrlParser: true,
+ useUnifiedTopology: true
+ });
+
+ mongoose.connection.on('connected', function () {
+ info(chalk.blue(' [ ✓ ] ') + 'Application - Connected to MongoDb');
+ });
+
+ mongoose.connection.on('error', function (err) {
+ error('Mongoose default connection has occured ' + err + ' error')
+ });
+
+ mongoose.connection.on('disconnected', function () {
+ info('Mongoose default connection is disconnected')
+ });
+
+ process.on('SIGINT', function () {
+ mongoose.connection.close(function () {
+ info('Mongoose default connection is disconnected due to application termination')
+ });
+ });
+}
+
+module.exports = connectDb()