Difference between PERN and MERN stack Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report 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: 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. 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.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: 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.Node and ExpressJS on server-side: Node and Express are used on the server-side for the purposes mentioned above.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 queriesPostgres as a SQL database is suited for complex queriesNot for hierarchical data storageBest for hierarchical data storage Comment More infoAdvertise with us Next Article MERN Full Form B bhavikbhatia17 Follow Improve Article Tags : MERN Stack MongoDB NoSQL Similar Reads MERN Stack The MERN stack is a widely adopted full-stack development framework that simplifies the creation of modern web applications. 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