Kshitij Singh
1 min read

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Kotlin to JavaScript: A Comprehensive Guide


Kotlin is a modern, statically-typed programming language that has gained popularity for its concise syntax and interoperability with Java. JavaScript, on the other hand, is the backbone of web development. Converting Kotlin to JavaScript can open up new possibilities for developers. This article will guide you through the process, benefits, and tools for converting Kotlin to JavaScript. Why Convert Kotlin to JavaScript? Kotlin’s interoperability with JavaScript allows developers to leverage Kotlin’s features while targeting the JavaScript ecosystem. This can be particularly useful for web development, where JavaScript is the dominant language.

How to Convert Kotlin to JavaScript

  1. Setting Up the Environment
    • Install Kotlin and Node.js.
    • Use Kotlin/JS plugin in your IDE.
  2. Writing Kotlin Code
    • Write your Kotlin code as usual.
    • Ensure that your code is compatible with JavaScript.
  3. Compiling Kotlin to JavaScript
    • Use the Kotlin compiler to convert your Kotlin code to JavaScript.
    • Command: kotlinc-js -output output.js input.kt
  4. Testing the JavaScript Code
    • Run the generated JavaScript code using Node.js or a web browser.
    • Debug any issues that arise.
Tools for Kotlin to JavaScript Conversion
  • Kotlin/JS Plugin: Integrates with your IDE for seamless conversion.
  • Kotlin Compiler: Converts Kotlin code to JavaScript.
  • Webpack: Bundles your JavaScript code for deployment.

Benefits of Kotlin to JavaScript Conversion

  • Code Reusability: Use the same codebase for both JVM and JavaScript.
  • Modern Syntax: Kotlin’s modern syntax can make your code more readable and maintainable.
  • Interoperability: Easily integrate with existing JavaScript libraries.
Challenges in Kotlin to JavaScript Conversion
  • Performance Overhead: The conversion process can introduce performance overhead.
  • Debugging: Debugging converted code can be more complex.
  • Compatibility Issues: Not all Kotlin features are fully compatible with JavaScript.


  • Kotlin Adoption: Kotlin is used by over 60% of professional Android developers.
  • JavaScript Popularity: JavaScript is the most commonly used programming language, with over 67% of developers using it.
Analogy Converting Kotlin to JavaScript is like translating a book from one language to another. While the core message remains the same, nuances and idiomatic expressions may need adjustments.

FAQ Section

What is Kotlin/JS?

Kotlin/JS is a part of the Kotlin language that allows you to compile Kotlin code to JavaScript. How do I set up Kotlin/JS? You can set up Kotlin/JS by installing the Kotlin plugin in your IDE and configuring your project to use the Kotlin/JS target.

Can I use existing JavaScript libraries with Kotlin/JS?

Yes, Kotlin/JS allows you to interoperate with existing JavaScript libraries.

Is there any performance overhead in converting Kotlin to JavaScript?

Yes, there can be some performance overhead due to the conversion process.

What are the benefits of using Kotlin over JavaScript?

Kotlin offers a more modern syntax, null safety, and better type inference compared to JavaScript.


Converting Kotlin to JavaScript can be a powerful way to leverage Kotlin’s features in the JavaScript ecosystem. While there are challenges, the benefits of code reusability, modern syntax, and interoperability make it a worthwhile endeavor. By following the steps outlined in this guide, you can successfully convert your Kotlin code to JavaScript and take advantage of both languages’ strengths.

  1. Kotlin/JS Documentation
  2. Node.js Official Site
  3. Webpack Documentation

By following this guide, you can seamlessly convert Kotlin to JavaScript and enhance your web development projects.

Free AI based kotlin to javascript code converter Online