What is a JavaScript Library?


What is a JavaScript Library?

One of the most extensively used programming languages in the world is JavaScript. It’s a scripting language that allows programmers to construct interactive user interfaces with dynamic content. It’s known as The Web Browser’s Language since it’s the most widely used language for creating web apps, and it works across all browsers. 

Owing to its adaptability, it is ideal for both back-end and front-end development, along with testing. There is also a multitude of JavaScript libraries and frameworks to choose from.

What is a JavaScript library?

JavaScript is, without a doubt, one of the most popular programming languages on the planet. Moreover, the number of situations where JavaScript has been proven to replace established platforms is growing all the time.  

As the breadth of the application expands, it becomes critical to employ a technique of code distribution that not only simplifies future development but also allows for mass reuse. JavaScript libraries do a fantastic job of solving this problem, and there are dozens, if not hundreds, of them to choose from.

Javascript libraries include pre-written JavaScript code that simplifies the completion of common and complicated tasks. For example, DOM manipulation, framework setup, and AJAX handling are all common targets for JavaScript libraries.

Active Communities

The most widely used libraries have active communities and forums where you may obtain help getting started with them. The library developer site is frequently used to get JavaScript libraries.   

Many library creators make both development and production versions of their libraries available. Comments and tips, as well as other non-minified code, are included in the development versions. Production versions are frequently minified and compressed for usage on live sites.

Some libraries are even accessible via content delivery networks (CDNs), including cdnjs, Google Hosted Libraries, jsDelivr, and Microsoft Ajax Content Delivery Network, to name a few.

Difference Between JavaScript Library And Framework

Now, let’s take a look at the major differences between Javascript library and framework:

Libraries And Their Working

Javascript libraries is a file that contains a set of prewritten functions or codes that you can repeatedly use while executing JavaScript tasks.       

Developers may plug in JavaScript library code as needed to your code. For instance, you can paste a relevant jQuery code for rendering animations or to integrate an auto-complete search bar in your web application. The jQuery code snippet then fetches the functionality the user asks for from the jQuery library and shows it in the user’s web browser accordingly.

JavaScript Frameworks And Their Working

Programmers mainly use specialised JavaScript libraries on-demand. On the other hand, JavaScript frameworks are an all-encompassing set of tools that you can manipulate and use for designing a website conveniently. 

In short, JavaScript libraries consist of functions that applications can call while performing a specific task. Whereas a framework stands for how you design an application.

Frameworks provide you with a structure to build your project around (like a skeleton). The framework supplies page templates that developers use to generate this structure, where certain places are kept aside for entering framework code. This format varies from the library format as in that the programmer decides where to use the library code. 

The benefit of adopting JavaScript frameworks is that they can improve your code’s readability and make it look well-structured. Additionally, the framework will reduce the time required for code development, testing, and debugging. 

However, note that any JavaScript code you write on top of JS frameworks must adhere to the framework’s rules and standards, restricting the flexibility you have when using a library. All of that structure might be a drawback of utilizing a framework. 


JavaScript libraries and frameworks are effective in speeding up the development of your website or app. As a web developer, selecting the appropriate one for your project is critical.

Developers use various different frameworks and libraries for different reasons. Each has its own pros and cons. When selecting one, you should keep your objectives and goals for your website or application in mind.

Learn JavaScript basics for free

Try our free 5 Day Coding Challenge where you can learn the basics of HTML, CSS and JavaScript. It takes one hour a day over five days. By day five, you will build your first webpage. Register now through the form below.

Coding the Future: Developer Spotlight - Sian C.

In October 2022, Sian C. joined Code Institute’s Level 5 Diploma in Web Application Development programme, which is run in association with Cardiff and Vale College and is funded via the Welsh Government’s Personal Learning Accounts (PLA) initiative. The course aims to equip learners with full-stack software development skills, preparing them to enter the digital […]

Coding the Future: Developer Spotlight - Nathan Parsley

In May 2023, Nathan Parsley joined the Level 5 Diploma in Web Application Development programme, delivered at East Kent College Group (Ashford) by Rachel Furlong using the Code Institute learning platform. The course equips learners with full-stack software development skills, preparing them to enter the digital workforce in various roles. Nathan has completed the programme […]

Coding the Future: Developer Spotlight - Wendy Bovill

In March 2023, Wendy Bovill joined the Level 5 Diploma in Web Application Development programme, which is delivered at Westminster Adult Education Service (WAES) using the Code Institute learning platform. The course equips learners with full-stack software development skills, making them ready to enter the digital workforce in various roles. Digital Academy leader Candice Fanning […]