RESTful Web Services with Node.js and Express


What APIs?

APIs (Application Programming Interfaces) allow consistent communication between software applications and other pieces of software. Either to connect internally to an application component, or to connect externally to a service.
The production of API- based modules and services is also a great way to achieve scalability and flexibility, because it allows us to build several applications based on modular and interchangeable modules, enabling scalability and maintenance facilitation.

Node.js

Node.js is a server-side programming environment operating on JavaScript. Within that framework, we can use JavaScript to create our apps, our REST APIs, and use its APIs to invoke external services. This point is especially supporting more robust front-end applications, most backend services are now being built as simple APIs. If it’s online, mobile, or desktop, they are all feeding back to a single API.

Developers should already familiar with JavaScript, making the transition more normal. This also has the advantage of uniting the entire codebase inside a single programming language. Combined with Express, we can quickly and simply build lightweight, fast, scalable APIs. REST makes certain APIs easier and more user-friendly to make the APIs more accessible.

Express

Express is one of the most common web frameworks for node.js. It is built on top of node.js http module, and adds routing support, middleware, view system etc. It is rather simple and lightweight, thus reducing the freedom for developers to make their own design decisions.

RESTful Web Services

REST stands for Representational State Transfer and is used by many stateless operations to access and manipulate the data. These operations are integral to the HTTP protocol and represent an essential CRUD (Create, Read, Update, Delete) functionality.
The available HTTP operations are:
  •      POST (create a resource or generally provide data0
  •       GET (retrieve an index of resources or an individual resource)
  •       PUT (create or replace a resource)
  •       PATCH (update/ modify a resource)
  •       Delete (remove a resource)



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