Three simple steps
How to use this tool?
This free online converter translates JavaScript source code into Gleam in three simple steps.
- Step 1
Add your JavaScript code
Type, paste, or upload the JavaScript code you want to translate.
- Step 2
Convert the code
Click Convert to translate the source code into Gleam.
- Step 3
Review the result
Review, copy, or download the resulting Gleam code from the output editor.
Language comparison
Key differences between JavaScript and Gleam
| Characteristic | JavaScript | Gleam |
|---|---|---|
| Syntax | C-like, flexible, dynamic, and permissive with many ways to accomplish tasks. | Inspired by ML-family languages, concise, strict, and statically structured. |
| Paradigm | Multi-paradigm: supports functional, imperative, and object-oriented programming. | Primarily functional, with strong emphasis on immutability and purity. |
| Typing | Dynamically typed, types are checked at runtime. | Statically typed with strong type inference, types are checked at compile time. |
| Performance | Generally fast due to highly optimized engines (e.g., V8), but can be affected by dynamic typing. | Compiles to Erlang BEAM or JavaScript, performance depends on target; benefits from BEAM's concurrency model. |
| Libraries and frameworks | Extensive ecosystem with thousands of libraries and frameworks for all purposes. | Smaller ecosystem, but can interoperate with Erlang/Elixir libraries when targeting BEAM. |
| Community and support | Large, mature, and active global community with abundant resources and support. | Small but growing community, less support and fewer resources compared to JavaScript. |
| Learning curve | Relatively easy to start, but quirks and dynamic nature can make mastery challenging. | Steeper learning curve due to functional paradigm and static typing, but simpler syntax can help. |
Common questions
Frequently Asked Questions
How do I convert JavaScript to Gleam?
Paste your JavaScript code into the input box, confirm the languages are set to JavaScript and Gleam, and click Convert. CodeConvert AI analyzes your JavaScript code and generates equivalent Gleam code in seconds, preserving the original logic and structure.
What are the main differences between JavaScript and Gleam?
JavaScript and Gleam differ in syntax, type system, standard libraries, and common idioms, so copying code line for line usually will not compile. The converter maps each JavaScript construct to its closest Gleam equivalent. See the comparison table below for the key differences between JavaScript and Gleam.
Is the converted Gleam code accurate?
The AI produces high-quality Gleam code that preserves the behavior of your original JavaScript code and follows Gleam conventions. It handles common patterns, data structures, and idioms for both JavaScript and Gleam. For large or performance-critical code, review and test the Gleam output before using it in production.
Can I convert an entire JavaScript project to Gleam?
You can convert JavaScript 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 JavaScript to Gleam. Signing in for free raises the input limit to 25,000 characters per conversion for larger files.
Can I convert Gleam back to JavaScript?
Yes. CodeConvert AI converts in both directions, so you can convert Gleam to JavaScript just as easily using our Gleam to JavaScript converter. Try the Gleam to JavaScript Converter
Is the JavaScript to Gleam 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 JavaScript to Gleam without an account for up to 5 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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