JavaScript started its journey way back in 1995 and was built for the Netscape Navigator web browser. Typescript, on the other hand, is the language for the design and development of large applications. It is used widely in trans compiling javascript. That means Typescript is JavaScript that comes with some extra loaded features. Actually, most Javascript development services these days give importance to Typescript as a crucial skillset for web projects.

Let us have a look at the key differences between Typescript and JavaScript.

  • Typescript has the advantage over JavaScript as the language is just a superset of JavaScript that trans compiles to JavaScript while being used for large projects.
  • JavaScript helps improve the HTML based web pages to incorporate interactive and design-centric elements. Though it is used mainly on the client-side, it can be used for developing both client-side and server-side applications. Typescript is widely popular for its trans-compilation to JavaScript required for large projects.
  • JavaScript stands apart from other technologies simply because it does not need expensive tools and often all that developers need is a basic text editor like notepad to start with the project. Just because it is an interpreted language that works within a web browser, developers don’t need to go for a separate compiler. In complete contrast, Typescript is basically a powerful coding language that requires additional support of IDE tools.
  • JavaScript cannot be used into various projects as a fully competent language just because it is short of several key features. Moreover, there are shortcomings like the absence of support for reading or writing of files on the client-side. In contrast, Typescript is a strongly typed object-oriented compile language. Typescript is equally a powerful programming language and a repository of development tools.
  • Typescript offers full support to a number of JavaScript libraries. Moreover, Typescript used along with JavaScript can utilise most of the JavaScript frameworks, libraries and tools for different projects.
  • Microsoft developed Typescript for the only purpose of making large scale app development easier for both Microsoft projects and projects for other customers.
  • A key shortcoming of JavaScript is that it is unfit for being used in any network application as it doesn’t have any support for this. This is where Typescript comes as a solution.
  • Typescript provides full support for the writing of definition files that can accommodate type information of the already existing JavaScript libraries. This makes it easier for other programs to make use of the values already defined in the files.
  • The compiler of typescript is written in Typescript language. But it has the capability to compile to JavaScript.

TypeScript Pros


  • Optional static typing of TypeScript is tremendously helpful. Because of this, a variable after being declared doesn’t change its type and can only take certain values. This results in less errors in the code and improved performance.
  • TypeScript by detecting common bugs right at the compile stage takes away concerns of the developers and helps them concentrate more on the app logic.
  • TypeScript is highly predictable as all aspects just stay in the way it was originally defined.
  • Typescript code is highly readable and expressive. From the code, one can easily grasp the intent of the developers.
  • TypeScript offers rich IDE support. It offers support with several features such as code navigation and autocompletion for allowing precise suggestions.
  • TypeScript offers concepts belonging to class-based object-oriented programmings (OOP) such as classes, interfaces, inheritance, and several others.
  • TypeScript offers full cross-platform and cross-browser compatibility allowing the web app to run across multiple device platforms and browsers.
  • TypeScript enjoys great demand as an open-source language. It also boasts of a steadily growing community.


TypeScript Cons

  • Developers having expertise with C#, C++ or Java often think that TypeScript is not a true statically typed language. Naturally, there is the risk of weird type conversions during runtime.
  • TypeScript requires developers to learn a new JavaScript language. In spite of the similarities, taking the labour to learn types and some typescript-specific elements is often discouraging for JavaScript developers.
  • Because of the better code readability thanks to syntactic sugar and type annotations the development process can slow down. Moreover, additional annotations also make typescript files bigger.
  • Since browsers can’t interpret the code of TypeScript code, you have to go through the extra step of transpiring the code to JavaScript before running.

Pros and Cons of JavaScript


Though Javascript has been there as one of the most dominant languages for all these years, JavaScript has its own pros and cons that we will discuss here briefly.

Pros of JavaScript

  • JavaScript allows building fast-paced apps. Being an ‘interpreted’ language, it reduces the time for compilation. Moreover, JavaScript as a client-side script makes the execution of the program faster.
  • JavaScript is simple and easy to learn. Its structure is very simple for new developers to understand.
  • As almost all modern browsers support JavaScript, it is very popular and is used by all big tech companies including Google, Amazon, PayPal, etc.
  • JavaScript is highly interoperable and works perfectly with other programming languages.
  • Just because JavaScript operates on the client-side, the data validation can be done on the browser instead of sending it off to the server. This ensures a faster loading speed.
  • JavaScript allows a lot of options to create eye-catchy web interfaces.
  • With the use of third-party add-ons of various types, Javascript apps can further add features and functionalities.
  • JavaScript is equally used for front-end as well as back-end development. For both, we have a whole array of frameworks.
  • JavaScript enhances the performance of web apps by reducing the code.

Read more: Which JavaScript Framework Will Take Lead in 2020?

Cons of JavaScript

  • As the JavaScript code is openly viewable to the user, using the code for malicious purposes is still a possibility comprising security.
  • The JavaScript code is interpreted by different browsers in different ways and at times new browsers may not offer full support to new functions.
  • JavaScript has a lack of support for debugging.
  • JavaScript only provides support for single inheritance and doesn’t support multiple inheritances.
  • With Javascript, a single error in code can stop the rendering of the entire web app code on the website.

To conclude, in the competition between Typescript and JavaScript, the latter seems to have a clear edge. But both languages are powerful and can be useful for their befitting or appropriate projects.