Online CoffeeScript to Gleam Converter

upload icon Click to select or drop your input code file here.

You can also type the input code below.

How to use this tool?

This free online converter lets you convert code from CoffeeScript to Gleam in a click of a button. To use this converter, take the following steps -

Type or paste your CoffeeScript code in the input box.
Click the convert button.
The resulting Gleam code from the conversion will be displayed in the output box.

Characteristic	CoffeeScript	Gleam
Syntax	Concise, Python-inspired syntax that compiles to JavaScript; reduces boilerplate and uses significant whitespace.	Clean, ML-inspired syntax with explicit type annotations; designed for clarity and safety, compiles to Erlang or JavaScript.
Paradigm	Primarily imperative and object-oriented, with some functional features inherited from JavaScript.	Functional programming, emphasizing immutability and pattern matching, inspired by ML and Erlang.
Typing	Dynamically typed, inherits JavaScript's type system.	Statically typed with strong type inference and no nulls, providing compile-time safety.
Performance	Performance is similar to JavaScript since it compiles directly to it; no inherent optimizations.	Runs on the Erlang VM (BEAM) or compiles to JavaScript; benefits from Erlang's concurrency and reliability.
Libraries and frameworks	Access to the entire JavaScript ecosystem, including Node.js and browser libraries.	Can use Erlang and Elixir libraries (with some limitations); ecosystem is smaller and still growing.
Community and support	Mature but declining community; most modern JavaScript projects use ES6+ instead.	Small but active and growing community, especially among Erlang/Elixir developers.
Learning curve	Easy for those familiar with JavaScript; simple syntax but may be confusing due to implicit behaviors.	Moderate; easier for those with functional programming experience, but explicit typing and new concepts may require adjustment.