Difference between JavaScript and TypeScript

Difference between JavaScript and TypeScript
Written by Sagar RabidasNovember 24, 2021
8 min read
Sagar Rabidas

Software Developer

Today we will know what difference between JavaScript and TypeScript.

JavaScript vs TypeScript

Javascript is the maximum popular and used programming language in internet improvement. Typescript is a superset of javascript and is getting recognition whilst building internet packages. Whilst typescript is a superset of javascript, it brings many benefits for software developers which could help them construct net apps quicker and in a greater prepared way. In this blog, let's examine the distinction between typescript and javascript and examine javascript and typescript capabilities.


Javascript is the maximum famous programming language for internet improvement. Javascript is additionally known as JS is a high-degree interpreted scripting programming language that is used in net development. Not like different popular programming languages that use a compiler to bring together the language, javascript makes use of an interpreter to transform javascript to gadget code.

Javascript’s idea turned into design via Brendan Eich in 10 days in May 1995. The primary official call of javascript became LiveScript and became shipped in Netscape navigator 2.0. Javascript firstly managed with the aid of Netscape is presently controlled by way of Mozilla foundation. In 1997, javascript changed into regularly occurring by way of ECMA worldwide and became a general. The present-day model of javascript in ECMAScript 2019.



Typescript is a strongly typed superset of javascript. Typescript adds static sorts to javascript. Typescript makes javascript a complete programming language and provides a strongly kind declarative shape to javascript programming. Typescript uses javascript and c# syntaxes and complies with native javascript. Nowadays, typescript is being used to construct massive open-supply initiatives inclusive of angular.

The typescript was evolved with the aid of Microsoft for the builders who want to build scalable packages in javascript and produce their expertise and enjoy established and modern-day programming languages which include c# and c++. A c# developer can use lessons, types, gadgets, their homes, and strategies and without too much worry about javascript syntaxes.

Typescript uses a transcompiler or transpiler, a source-to-supply compiler that interprets one language into any other language. Typescript transpiler converts typescript code into javascript code.


JavaScript Characteristics

  1. JavaScript is a high-level scripting programming language.
  2. JavaScript is a multi-paradigm programming language and supports event-driven, functional, and imperative programming styles. Structured programming syntax in JavaScript is similar to C language and supports common statements including if statements, while loops, switch statements, and do-while loop.
  3. While JavaScript majorly runs on the client-side in the user’s browser, but it can run on the server-side, and today there are several JavaScript-based libraries and frameworks are available.
  4. JavaScript combined with HTML and CSS makes a majority of the Web pages on the Web. While HTML and CSS combo is used to build Web pages (user interfaces), JavaScript is used for functional coding.
  5. The majority of the Web browsers including Google Chrome, Microsoft Edge, Apple Safari, and Mozilla Firefox fully support JavaScript.
  6. JavaScript is a dynamically typed language that means the type of an object or variable is decided at runtime and the same variable can be used to store different types and values.
  7. While JavaScript is not a fully object-oriented programming language but is almost objects-oriented. JavaScript has concepts of objects, properties, and functions. Inheritance in objects is supported via prototypes.
  8. The function is a first-class member of JavaScript. That means, a function is considered to be an object and can have its properties and methods.

TypeScript Characteristics

  1. TypeScript developed Microsoft, is an open-source programming language that adds types to JavaScript. TypeScript runs on any platform, any device, and in any browser. TypeScript source code and project are available on Github.
  2. TypeScript is a static type language. This means you must declare the type of variables and objects before using them.
  3. TypeScript adds optional types, classes, and modules to JavaScript.
  4. TypeScript supports tools for large-scale JavaScript applications for any browser, for any host, on any OS.
  5. TypeScript is compiled to clean, readable, standards-based JavaScript.
  6. TypeScript extends JavaScript syntax, so any existing JavaScript programs work with TypeScript without any changes.
  7. TypeScript is designed for the development of large applications and when compiled it produces JavaScript to ensure compatibility.
  8. The command-line TypeScript compiler can be installed as a Node.js package.
  9. TypeScript is supported by most of the popular developer IDEs including Visual Studio, Visual Studio Code, Sublime Text, Atom, Eclipse, Emacs, WebStorm, and Vim.

JavaScript and TypeScript Differences


  • JavaScript is a scripting language. The code is interpreted using an Interpreter.
  • JavaScript supports dynamic typing. Types can store any type of data. For example, var num.
  • JavaScript doesn't support interfaces.
  • JavaScript does not support optional parameters.
  • JavaScript does not support REST parameters.
  • JavaScript does not support generics.
  • JavaScript does not support modules.


  • It is an object-oriented programming language and has a compiler. The code is compiled.
  • TypeScript supports static typing. The type of the variable must be declared before use. For example, var num: number.
  • TypeScript supports interfaces.
  • TypeScript supports optional parameters.
  • TypeScript supports REST parameters.
  • TypeScript supports generics.
  • TypeScript supports modules.
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Sagar Rabidas
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made with by Abhishek & Priyanka Jalan