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Microservices in node js

Microservices nodejs

-> Microservices-based architecture lets you split your application 
   into small units.
-> Each part can independently deploy and scale; 
   it does not matter if different programming languages and teams write it.
-> You can also test the small units individually.

Source: grepper.com

HOW TO MAKE MICROSERVICES IN NODEJS

// Microservices are small components that together work to make your app work.
// Let's see an example!
// You wanna make a forum app for example
// You will have
//  - Users
//  - Posts
//  - Notifications
// Instead of making all of that into one big services, we split it up
// One service manages the user, for example (pseudocode javascript)
const db = require('db');

if (!db.find(username)) {
	send(handle(Error.NOTFOUND))
}

const dbAccount = db.find(username);
const passwordHash = dbAccount.password;
const enteredPasswordHash = hashFunction(enteredPassword);

if (passwordHash === enteredPasswordHash) {
	send(generateUserToken(dbAccount))
}
else {
  send(handle(Error.WRONGPWD))
}
// Another microservice for posts

if (requestType === RqType.POST) {
	db.add('post', {
    	id: accountId,
      	username: accountUsername,
      	title: title,
      	replies: [],
      	upvotes: 0,
      	postId: uuidv4(),
    });
  notificationsMicroservice.communicate('post_sent');
} else if (requestType === RqType.DELETE) {
	db.remove('post', requestPostId);
}

// And the notifications microservice
on.event('post_sent', (context) => {
	const notif = {
    	title: `New post by ${context.poster}`,
      	message: `${context.poster} just posted a new post! Come check it out`,
      	picture: context.posterPfp,
    };
  
  	context.send(notif);
});


// This makes your application clean and concise with everything being split in
// its own small service

Source: grepper.com

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