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JavaScript vs TypeScript

JavaScript and TypeScript are both popular programming languages used for web development, particularly on the client side. While JavaScript has been the dominant language for web development for many years, TypeScript has gained popularity in recent years as a more structured and typed alternative. In this article, we'll compare and contrast JavaScript and TypeScript, highlighting the key differences between the two languages.

What is JavaScript?

JavaScript is a high-level, dynamic, and interpreted programming language that is widely used for web development. It was first introduced in 1995 and has since become one of the most popular programming languages in the world. JavaScript is primarily used for front-end web development to create interactive user interfaces and dynamic web applications. However, with the rise of Node.js, JavaScript is now also used for server-side programming.

JavaScript is a dynamically typed language, which means that variables do not need to be declared with a specific data type. This allows for flexibility in coding, but can also lead to errors if the wrong data type is used. JavaScript is often criticized for its lack of strict typing, as this can lead to errors that are difficult to catch and debug.

What is TypeScript?

TypeScript is a superset of JavaScript that was developed by Microsoft in 2012. It is an open-source language that extends JavaScript by adding optional static typing, classes, and interfaces. TypeScript is designed to make large-scale web applications more maintainable and easier to develop by adding more structure to the code.

TypeScript allows developers to specify types for variables, functions, and parameters, which helps catch errors before the code is executed. This makes it easier to debug code and catch errors early in the development process. TypeScript also supports object-oriented programming concepts like classes, inheritance, and interfaces.

Differences between JavaScript and TypeScript

One of the main differences between JavaScript and TypeScript is that JavaScript is a dynamically typed language, while TypeScript is a statically typed language. This means that in JavaScript, the data type of a variable can change during runtime, while in TypeScript, the data type is specified at compile time and cannot be changed during runtime. TypeScript also provides better tooling support for developers, such as code completion and error checking.

TypeScript is also considered to be more scalable than JavaScript. Because TypeScript allows developers to add more structure to their code, it is easier to maintain and modify as the codebase grows. This is particularly useful for large-scale web applications, which can become difficult to manage without a structured and typed language.

Which one should you use?

The choice between JavaScript and TypeScript depends on the needs of the project and the preferences of the development team. JavaScript is a great choice for small to medium-sized projects that require flexibility and quick development. It is also a good choice for projects that are primarily focused on front-end web development.

On the other hand, TypeScript is a better choice for large-scale projects that require more structure and maintainability. It is also a good choice for projects that require more complex programming concepts.


Ultimately, both JavaScript and TypeScript are powerful programming languages that have their own strengths and weaknesses. The choice between the two depends on the needs of the project and the preferences of the development team.


  • JavaScript MDN - [1]
  • TypeScript - [2]