What Exactly Do JavaScript Developers Do?

Developers employ an array of programming languages to turn concepts and designs into functioning, visually appealing websites and software. JavaScript plays an essential role in the creation of dynamic, interactive components for websites, greatly improving the user experience. It is used by more than 95% of all websites to make dynamic content a reality.

Businesses are keen to recruit professionals who are proficient in JavaScript, as it is an integral component of front-end web development. According to DevSkiller, a developer skills testing organisation, by 2023, JavaScript is forecast to be the most sought-after IT skill, with 72 percent of businesses requiring the expertise of JavaScript developers.

Works, amongst other businesses, rely on JavaScript developers to create a variety of applications and outputs. It is important to differentiate JavaScript from Java, another language, as they are two distinct entities. JavaScript enables the creation of a range of products and services, such as web-based applications and software, as well as visualisations, animations and interactive online experiences.

A Comparison Between Java and JavaScript

Despite sharing a similar name, JavaScript and Java are two distinct programming languages. Java, which was released by Sun Microsystems in 1995 and is now owned solely by Oracle, is used on more than a billion smartphones worldwide as it is included in Google’s Android operating system. It is extensively used in the development of Android apps, desktop applications, and enterprise-level software.

In the early 1990s, a developer at Netscape had the idea of creating a programming language that could instruct a computer to process user input without the need for additional components or compilation. This language was initially integrated with Netscape Navigator and referred to as ‘LiveScript’. However, in order to capitalise on the growing popularity of Java, it was rebranded as ‘JavaScript’.


  • Object-oriented programming languages differ from procedural languages in that they rely on the idea of “objects” to both store and manipulate data. These objects are collections of data and related operations that can be used and reused in various contexts, allowing for greater flexibility and scalability when writing code. Examples of object-oriented programming languages include Java and C++.
  • There is a place for both in front- and back-end programming.


  • The languages have distinct methods of construction, notation, and delivery.
  • Instead of requiring compilation, JavaScript is just plain code.
  • In comparison to Java, which is strongly typed, JavaScript is weakly typed, meaning that no specific data type needs to be assigned to variables when they are declared. This allows developers to create code without having to specify any restrictions on the data types of the variables.
  • It’s because each language requires a unique plugin.
  • Java applications can be run on both web browsers and Java Virtual Machines, whereas applications written in JavaScript can only be executed on web browsers.
  • Client-side JavaScript involves more work than server-side Java, which is why the latter is more often utilised.

Development of the Initial Phase of a Website

JavaScript is a programming language which is employed by front-end web developers to construct the user interface of websites and applications. It is used in conjunction with HTML and CSS, the two main markup languages which are used to create the elements of the user interface.

Web pages are formatted and organised using hypertext markup language (HTML), which is the technology that enables us to add elements such as text, images, videos and links to other webpages to the page. HTML is used to introduce content onto a webpage, while Cascading Style Sheets (CSS) is deployed to style the content. CSS is responsible for the visual elements of a website, such as its shape, size, colour and font.

Developers utilise JavaScript to take static online content and make it dynamic and interactive. It enables new content to be automatically loaded as visitors scroll across a website, and is associated with all components that refresh automatically, such as interactive forms, auto-complete functions and animated menus.

JavaScript also produces other features such as:

  • Data entry fields that validate user input to guarantee accurate and full form submissions.
  • Moving pictures
  • Sentences tailored to the time of day
  • Web-based, interactive maps

The following video explains how JavaScript developers may enhance websites with several practical features.

Use in Website’s Backend and Beyond

Despite being commonly associated with front-end web development, JavaScript can be applied to a multitude of other purposes. For example, when creating and managing the backend of applications, developers can use a JavaScript language such as Node JS. By utilising this language, developers can create and maintain the backend of a variety of online services, including websites and applications.

Node.js is a free and open-source server-side application framework. It utilises a server’s downtime and an event loop to process requests quickly.

All three types of application development – Desktop, Mobile, and Hybrid – utilise the JavaScript programming language, as do mobile operating systems such as Android and iOS. This is because the JavaScript engines (interpreters which interpret the JavaScript language and translate it into machine code that a CPU can execute) are written using the C++ programming language, allowing them to be seamlessly incorporated into any C++-based programme used for these uses.

Added Results

JavaScript has become an indispensable tool for creating dynamic and interactive websites, but it can also be used in other areas of web development. It is used to create online and mobile applications, web servers, and web-based slide presentations. Moreover, it is even used in the creation of games.

Creation of Websites

JavaScript is a powerful programming language that enables users to incorporate a variety of materials onto a website without the need to reload the entire page. It also provides users with a range of front-end development features such as interactive forms and animation. Furthermore, JavaScript is compatible with a variety of third-party online applications such as Flash, PDFs and widgets.


By combining the power of JavaScript and HTML5, developers are able to create interactive games with sophisticated visuals and animation that can be controlled using a keyboard. By combining multiple images into a single file, developers can reduce their reliance on server resources, and by using libraries such as Ease JS, they can save on traffic and speed up the progression of the game.

Mobile applications

JavaScript is an incredibly powerful and versatile programming language, enabling developers to create mobile applications that are compatible across a range of platforms, including iOS, Android, Windows, and Blackberry. This ensures rapid content loading and seamless support for a variety of screen sizes and resolutions. Such capability is made possible due to the availability of frameworks like React Native, which are usually open-source and supported by active communities that provide useful documentation and tools to assist developers.

Mobile applications

JavaScript enables developers to create faster web applications by enabling direct interaction between the browser and the application, rather than having to send data through a server. In order to make the most of JavaScript, developers may integrate third-party APIs to improve its efficiency and usefulness. By integrating APIs, applications can access only the information they actually require, instead of having to store all of the available data.

Website host computers

When developing systems with the Node JS framework, developers can use JavaScript to construct their own web servers. Benefitting from an event-driven architecture, this type of web server is able to rapidly alternate between tasks without having to transfer large amounts of data. To reduce errors, commands are executed sequentially in single-threaded processes.

Slide shows on the Internet

Interactive, web-based slide presentations are now achievable with the utilisation of JavaScript (JS) packages, such as Reveal JS and Bespoke JS. These slide decks are optimised to be viewed on multiple devices, including desktops, mobile phones and tablets, as they are complemented with visuals, such as graphics and bulleted lists.

Programmers skilled in JavaScript are in high demand.

The increasing complexity of web applications and the widespread implementation of JavaScript mean that the demand for experienced JavaScript developers is continually growing. With the continued emphasis on user interaction and the ever-evolving nature of technology, it is highly likely that the need for competent JavaScript developers will remain consistent for the foreseeable future.

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