Difference between PERN and MERN stack

What is a stack, if you are familiar with full-stack development you might have come across the terms MEAN, MERN, MEVN, etc. These are web stacks consisting of a collection of software and frameworks used for building a web application from the front-end and back-end. You can learn any of these stacks to become a Full-stack developer.

A stack usually consists of a database, server-side and client-side technology, and a web server.

MERN STACK: MERN stack is a collection of MongoDB, Express, React Library, and NodeJs. MERN is basically a collection of software that you require to create a dynamic website and web applications.

• M – MongoDB: It is a Document-based No SQL Database. It stores data in JSON-like documents.
• E – ExpressJS: It is a Server-side framework and runs on a NodeJS server.
• R – React: It is a JavaScript library used in the front-end for creating attractive layouts.
• N – NodeJS: It is a server-side technology that lets you run JavaScript on a server.

From client-side to server-side the language used is JavaScript it becomes easier for the developers to learn and develop a web application. Which reduces the cost and time of development and makes development efficient.

Working Of MERN stack:

1. ReactJS for front-end: On the top comes to React which is a JS Library used to create dynamic client-side apps. We can connect these front-end interfaces with back-end data. 
2. NodeJS and ExpressJS for backend: Which lets you use JavaScript on a server and on Node server runs Express. Express is a fast web framework for server-based on Node.js. It handles HTTP requests and responses.
3. MongoDB as a database: All complex or simple web applications that want to store data need a database here we use Mongo Db which is a No SQL database that stores data in JSON-like documents as we mentioned above.

PERN STACK: This stack consists of PostgreSQL, Express, React, and Node. Helps in building a full-stack web application. This stack involves PostgreSQL as a database instead of mongo to store and manage data. This is a great choice if you want a stable database which is great for complex duties.

• P – PostgreSQL: It is an ORDBMS (Object Relational Database Management System). A SQL-based database management system.
• E – Express: It is a Server-side framework based on Node JS to ease out the tasks on the server-side.
• R – React: It is a JavaScript library used for creating attractive and complex layouts.
• N – NodeJS: It is a server-side technology that lets you run JavaScript on a server.

Working Of PERN stack:

1. React for frontend: It is used in the front-end as mentioned above. A JavaScript library that is helpful in building complex user interfaces. Which communicates with the server-side technologies.
2. Node and ExpressJS on server-side: Node and Express are used on the server-side for the purposes mentioned above.
3. PostgreSQL for the database: While to store data in a database instead of No SQL database MongoDB here we use an SQL database PostgreSQL. It stores data in Tabular format in rows and columns like other SQL databases(Ex- MySQL). It has strict rules for data integrity and better for heavy transactions than No SQL databases.

Differences between PERN and MERN:

MERN	PERN
In MERN we use a No SQL-based Database(MongoDB).	In PERN we use an SQL based Database(PostgreSQL)
While Mongo is used when a developer wants a faster, distributed database they choose Mongo.	PERN is used when a developer wants to be more ACID compliant.
As NoSQL, it isn’t suited for complex queries	Postgres as a SQL database is suited for complex queries
Not for hierarchical data storage	Best for hierarchical data storage