Three simple steps
How to use this tool?
This free online converter translates Kotlin source code into JavaScript in three simple steps.
- Step 1
Add your Kotlin code
Type, paste, or upload the Kotlin code you want to translate.
- Step 2
Convert the code
Click Convert to translate the source code into JavaScript.
- Step 3
Review the result
Review, copy, or download the resulting JavaScript code from the output editor.
See it in action
Examples of Kotlin to JavaScript conversion
These examples show Kotlin source code and the corresponding JavaScript translation. Generated results can vary as AI models are updated.
Example 1
Is String Palindrome
Program that checks if a string is a palindrome or not.
Kotlin code
JavaScript code
Example 2
Even or Odd
A well commented function to check if a number if odd or even.
Kotlin code
JavaScript code
Language comparison
Key differences between Kotlin and JavaScript
| Characteristic | Kotlin | JavaScript |
|---|---|---|
| Syntax | Kotlin has a concise and expressive syntax that is similar to Java but with some added features such as null safety and extension functions. | JavaScript has a more flexible and dynamic syntax that allows for more creative coding styles, but can also lead to more errors and bugs. |
| Paradigm | Kotlin is a statically-typed, object-oriented language that also supports functional programming concepts. | JavaScript is a dynamically-typed, object-oriented language that also supports functional programming concepts. |
| Typing | Kotlin is a statically-typed language, which means that variables must be declared with a specific data type at compile time. | JavaScript is a dynamically-typed language, which means that variables can change data types at runtime. |
| Performance | Kotlin is generally faster than Java because it is more concise and has better type inference. | JavaScript can be slower than other languages because it is interpreted rather than compiled. |
| Libraries and frameworks | Kotlin has a growing number of libraries and frameworks, including Spring Boot and Ktor. | JavaScript has a vast ecosystem of libraries and frameworks, including React, Angular, and Node.js. |
| Community and support | Kotlin has a growing community and is backed by Google, which provides strong support. | JavaScript has a massive community and is supported by many companies, including Google, Facebook, and Microsoft. |
| Learning curve | Kotlin has a relatively low learning curve for Java developers because it is similar to Java in many ways. | JavaScript has a steep learning curve due to its flexible syntax and many quirks and gotchas. |
Common questions
Frequently Asked Questions
How do I convert Kotlin to JavaScript?
Paste your Kotlin code into the input box, confirm the languages are set to Kotlin and JavaScript, and click Convert. CodeConvert AI analyzes your Kotlin code and generates equivalent JavaScript code in seconds, preserving the original logic and structure.
What are the main differences between Kotlin and JavaScript?
Kotlin and JavaScript differ in syntax, type system, standard libraries, and common idioms, so copying code line for line usually will not compile. The converter maps each Kotlin construct to its closest JavaScript equivalent. See the comparison table below for the key differences between Kotlin and JavaScript.
Is the converted JavaScript code accurate?
The AI produces high-quality JavaScript code that preserves the behavior of your original Kotlin code and follows JavaScript conventions. It handles common patterns, data structures, and idioms for both Kotlin and JavaScript. For large or performance-critical code, review and test the JavaScript output before using it in production.
Can I convert an entire Kotlin project to JavaScript?
You can convert Kotlin files one at a time by pasting each file's code. For a full migration, convert each file and then review how classes, dependencies, and project structure map from Kotlin to JavaScript. Signing in for free raises the input limit to 25,000 characters per conversion for larger files.
Can I convert JavaScript back to Kotlin?
Yes. CodeConvert AI converts in both directions, so you can convert JavaScript to Kotlin just as easily using our JavaScript to Kotlin converter. Try the JavaScript to Kotlin Converter
Is the Kotlin to JavaScript converter free, and do I need to install anything?
Yes, it is free and runs in your browser with nothing to install and no IDE extension required. You can convert Kotlin to JavaScript without an account for up to 2 conversions per day. Sign in for free for higher limits.
What are the benefits of signing in?
Signing in unlocks CodeConvert AI's Pro converter with more powerful AI models, a built-in chat assistant, code execution, saved conversion history, and personal notes. Every free account includes 5 credits and supports up to 25,000 characters of input per conversion, with no credit card required.
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