TypeScript vs JavaScript: What’s the difference?

If you’ve ever worked on a website development project, you’ve probably come across JavaScript. In fact, it has been the most popular scripting language for a long time.

TypeScript, on the other hand, is a programming language more suitable for large applications: open source, it was developed by Microsoft in 2012, mainly because JavaScript code became too complex to manage large-scale applications.

TypeScript is a superset of JavaScript, so generally anything that codes in JavaScript is also valid in TypeScript. So if you save your JavaScript (.js) file with the TypeScript (.ts) extension, it will still work fine.

Before highlighting the differences between the two, let us understand what each of these two languages ​​look like!


Often abbreviated as JS, JavaScript is a software design language which follows the ECMAScript layout. JavaScript is compiled just before execution. This includes dynamic typing, brace syntax, first-class functions, and prototype-based object orientation. Along with CSS and HTML, JavaScript is one of the essential technologies of the web.

Javascript allows Create Interactive Web Pages, which is an essential aspect of modern websites. Since most websites use it for the behavior of their client-side pages, it makes sense that all web browsers have a dedicated JavaScript engine for this purpose. Note that while JavaScript engines once existed only in web browsers, they are now integrated into some servers (usually via Node.js).

There are many derivatives of JavaScript such as TypeScript, CoffeeScript, Dart and Kotlin. They have also been implemented in many applications trained with frameworks such as Cordova and Electron.

As a multiparadigm programming language, JavaScript supports imperative, event, and functional styles and has an application programming interface (API) that allows it to manipulate dates, text, standard data structures, the Document Object Model (DOM) without forgetting regular expressions. allows to process.

benefits of javascript

JavaScript may not be the most widespread coding language, but it is used alongside HTML to improve the quality of web pages. Furthermore, there are thousands of experienced developers who code in JavaScript and this programming language is adopted by all browsers.

Javascript can be considered as the right solution for small web projects and smaller teams. It’s common to use JavaScript without the help of build tools, and if you do use a framework, some of them don’t support TypeScript.

Additionally, you can use existing JavaScript libraries and frameworks develop web applications faster Streamlining your software development process.

TypeScript requires installing the JS libraries you use: an additional type definition results in an additional EPM package. So it is better to use a popular JavaScript library for your development as it will be properly maintained in future.


typescript is a programming language object oriented and open source, Created and maintained by Microsoft, TypeScript is actually a syntactic superset of JavaScript, adding optional static typing along the way.

intended for typescript building large applications and transcompiles to JavaScript. Ordinary JavaScript programs are also valid TypeScript programs, and the language can be used to build JavaScript applications for server-side execution, not just client-side execution.

there are many options translate To convert TypeScript to JavaScript. Specifically, you can use the default TypeScript validator, or the Babel compiler.

TypeScript supports files that may include type data from current JavaScript libraries, such as C++ header files can define the construction of current object files, allowing other programs to use values ​​defined in the files such as that they were statically TypeScript entities.

There are third-party header files for popular libraries like D3.js, jQuery, and MongoDB. TypeScript headers for basic Node.js modules are also accessible, allowing the development of Node.js programs in TypeScript.

The TypeScript compiler is written in TypeScript and compiled into JavaScript. It is registered under the Apache 2.0 License.


Advantages of TypeScript

TypeScript is an alternative preferred by developers who want to create code that is clean and beautiful, compact and readable. This is ideal for your larger projects or if you have multiple developers in your team working on one large project. Thus, the access modifier And thisinterface Typescript can have an additional advantage in API communication.

If your project uses React and your team is not familiar with its API, TypeScript provides type definitions. You can also use IntelliSense, which will help you navigate and see new interfaces.

Developing simple JavaScript code hasn’t been easier, especially if you prefer compile-time error checking: with TypeScript, it’s entirely possible to perform run-time type confirmation and validation at compile time.

What are the differences between TypeScript and JavaScript?


The TypeScript ecosystem is intuitive and powerful. It allows you to statically type a variety of idiomatic JavaScript strokes such as intersection, union type, and differentiated union.

JavaScript provides the possibility of discovery and coding without the creation phase.

data binding

TypeScript uses concepts such as interfaces and types to define the data it uses.

No such notion is offered in JavaScript.

learning curve

TypeScript has a fairly steep learning curve and requires advanced scripting knowledge.

On the other hand, JavaScript is easy to learn and a flexible language for writing scripts.

npm package

As with TypeScript, countless NPM packages contain static type definitions (or an external, easy to install one).

JavaScript has the ability to find and build code again without any build steps.

annotation and typing

To make the most of these features, TypeScript developers must constantly annotate code, whereas no annotation is required for JavaScript.

the compiler

TypeScript code must be compiled, whereas code in JavaScript is under no obligation to compile.

client side/server side

Although it can be used on the server side, TypeScript is mostly used on the client side. Javascript is used on both the server side and the client side.

In fact, although it is billed as “super JavaScript”, TypeScript is not intended to replace or make JavaScript obsolete. JavaScript resists and is still the most popular client-side scripting language.


TypeScript has a smaller community of developers than JavaScript, the latter being far more popular with software developers.


Looking at the differences between TypeScript and JavaScript, we can say that both the technologies have their advantages and disadvantages though.

JavaScript is best suited when you have a small team working on small web projects. On the other hand, if you have a more experienced, well-informed team and you want to hand over the management of a more complex project to them, TypeScript is a better option.

For small projects, using TypeScript can have overhead, as it takes time to translate the code into JavaScript, which is an extra step for rendering. Since JavaScript is executed directly on the browser, it is easier for small scripts to refresh or debug the code, whereas in the case of TypeScript, a developer would need a suitable IDE and configuration to run his code.

Whatever your preference, you can find developers on Codeur.com to strengthen your team. Describe your TypeScript or JavaScript project for free on the platform to get quotes from our freelance experts.

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