What Exactly Do JavaScript Developers Do?

To transform ideas and designs into visually-striking websites and software applications, Developers employ various programming languages. JavaScript is critical in developing dynamic and interactive components for websites, enhancing user experience significantly. It is a widely used language, powering over 95% of websites and making dynamic content accessible to users.

Proficiency in JavaScript is a highly valued skill for businesses seeking to hire experts in front-end web development. According to DevSkiller, an organisation that tests developer skills, JavaScript is projected to be the most sought-after IT skill by 2023. Approximately 72% of businesses intend to hire JavaScript developers.

At Works and other companies, JavaScript developers are crucial for developing several types of applications and outputs. It is essential to distinguish between JavaScript and Java as they are different programming languages. JavaScript allows for the development of a wide array of products and services, including web-based applications, software, visualisations, animations, and interactive online experiences.

Java vs. JavaScript: A Comparison

Although they have similar names, JavaScript and Java are distinct programming languages. Java was introduced by Sun Microsystems in 1995 and is now owned by Oracle. It is utilised on over a billion smartphones worldwide as it is integrated into Google’s Android operating system. It is primarily used in the development of Android apps, desktop applications, and enterprise-level software.

During the early 1990s, a developer at Netscape conceived of the idea of designing a programming language that could direct a computer to process user input without requiring additional components or compilation. At first, this language was integrated with Netscape Navigator and was known as ‘LiveScript’. However, it was eventually renamed ‘JavaScript’ to take advantage of the increasing demand for Java.


  • Object-oriented programming languages differ from procedural languages because they rely on the concept of “objects” to both store and manipulate data. Objects are collections of data and associated operations that can be utilised and reused throughout different contexts. This provides greater flexibility and scalability when coding. Some examples of object-oriented programming languages are Java and C++.
  • Both have a role to play in front-end and back-end programming.


  • These languages have unique approaches to building, notation, and delivery.
  • Unlike other languages that require compilation, JavaScript is composed of straightforward and unaltered code.
  • While Java is strongly typed, JavaScript is weakly typed, which implies that variables are not required to have a particular data type assigned to them when they are initially defined. This enables developers to write code without imposing any limitations on variable data types, a feature that distinguishes it from Java.
  • This is because each language necessitates a distinct plugin.
  • While Java applications can operate on web browsers and Java Virtual Machines, JavaScript applications can only run on web browsers.
  • Server-side Java is frequently used since it requires less effort than client-side JavaScript.

Creation of the First Stage of a Website

Front-end web developers use JavaScript, a programming language, to construct the user interface of websites and applications. This language is typically used in conjunction with HTML and CSS, the two primary markup languages used to build elements for the user interface.

Hypertext markup language (HTML) is the technology used to format and organise web pages, enabling us to add elements like text, images, videos, and links to other web pages on the page. By introducing content to a webpage, HTML is responsible for the structural elements, whilst Cascading Style Sheets (CSS) adds style to the content. CSS enhances the visible design attributes of a website such as its shape, size, colour, and typeface.

JavaScript is implemented by developers to enhance static online content and make it interactive and dynamic. By implementing JavaScript, refreshing components are enabled, such as interactive forms, auto-complete functions, animated menus, and new content is automatically loaded as visitors scroll through a website.

JavaScript also offers other functionalities including:

  • Input fields that validate user data to ensure complete and accurate form submissions.
  • Animated images
  • Customised sentences based on the time of day
  • Interactive maps based on the web

The video below illustrates how developers can improve websites by implementing various useful functionalities with JavaScript.

Usage in the Website’s Backend and Beyond

Despite being mainly linked with front-end web development, JavaScript is applicable to various other purposes. For instance, developers can employ a JavaScript language like Node JS when producing and handling the backend of applications. By using this language, developers can develop and sustain the backend of numerous online services, such as websites and applications.

Node.js is a free and open-source application framework, which supports server-side development. It employs an event loop and server downtime to expedite request processing.

JavaScript is utilised in all three categories of application development, namely desktop, mobile, and hybrid, as well as mobile operating systems like Android and iOS. This is possible because the JavaScript engines (interpreters used to interpret JavaScript and translate it into machine code executable by a CPU) are coded in the C++ programming language, allowing them to be seamlessly integrated into any C++-based program intended for these purposes.

Additional Outcomes

JavaScript has emerged as a crucial instrument for producing dynamic and interactive websites, and it’s not just limited to web development. It is employed for creating online and mobile applications, web servers, web-based slide presentations, and even games.

Website Development

JavaScript is a powerful programming language, which enables developers to add an array of content to a website without the need to refresh it. It provides numerous front-end development functionalities such as interactive forms and animations. Additionally, JavaScript is compatible with various third-party online applications such as Flash, PDFs, and widgets.


Through the amalgamation of JavaScript and HTML5, developers can design interactive games that feature advanced graphics and animations, and can be controlled via a keyboard. By merging multiple images into a single file, developers can minimize dependency on server resources, and by employing libraries like Ease JS, they can reduce traffic and accelerate the game’s advancement.

Mobile Applications

As a highly robust and versatile programming language, JavaScript allows developers to build mobile applications that can be used on several platforms, including iOS, Android, Windows, and Blackberry. This facilitates fast content loading and smooth support for various screen sizes and resolutions. Such potential is actualised with frameworks like React Native, which are typically open-source and supported by active communities that provide valuable documentation and tools to aid developers.

Mobile Applications

By enabling direct communication between the browser and the application, instead of having to relay data through the server, JavaScript enhances the speed of web applications, helping developers to create faster web applications. To make the best use of JavaScript, developers can integrate third-party APIs in order to enhance its efficiency and usefulness. The use of APIs permits applications to access only the information required, eliminating the need to retain all available data.

Host Computers for Websites

When designing systems using the Node JS framework, developers can use JavaScript to build their own web servers. Such web servers leverage an event-driven architecture, allowing them to switch between tasks quickly and efficiently, without having to transfer substantial data. To minimise errors, commands are processed sequentially in single-threaded processes.

Internet Slide Shows

With the aid of JavaScript (JS) packages like Reveal JS and Bespoke JS, interactive web-based slide presentations are now a reality. These slide decks are designed to be viewed on different devices, including desktops, mobile phones and tablets, and are enhanced with visuals such as graphics and bulleted lists.

The demand for programmers proficient in JavaScript is significant.

As web applications become increasingly sophisticated and JavaScript implementation becomes more prevalent, the requirement for experienced JavaScript developers is consistently escalating. Given the sustained focus on user interaction and the constantly evolving technology landscape, it seems highly probable that the need for skilful JavaScript developers will persist into the foreseeable future.

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