ExpressJS

ExpressJS is a web application framework that provides you with a simple API to build
websites, web apps and back ends. With ExpressJS, you need not worry about low level
protocols, processes, etc.
What is Express?
Express provides a minimal interface to build our applications. It provides us the tools that
are required to build our app. It is flexible as there are numerous modules available
on npm, which can be directly plugged into Express.
Express was developed by TJ Holowaychuk and is maintained by the Node.js foundation
and numerous open source contributors.
Why Express?
Unlike its competitors like Rails and Django, which have an opinionated way of building
applications, Express has no "best way" to do something. It is very flexible and pluggable.
Pug
Pug (earlier known as Jade) is a terse language for writing HTML templates. It -
 Produces HTML
 Supports dynamic code
 Supports reusability (DRY)
It is one of the most popular template language used with Express.
MongoDB and Mongoose
MongoDB is an open-source, document database designed for ease of development and
scaling. This database is also used to store data.
Mongoose is a client API for node.js which makes it easy to access our database from our
Express application.

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