Melange

OCaml for JavaScript developers.

Start building highly maintainable applications that can run on millions of devices.

A Solid Type System

Melange leverages OCaml's powerful type system to catch more bugs at compile time. Large, complex codebases become easy to maintain and refactor.

First-Class Editor and Tooling

Melange fully utilizes the power of the OCaml Platform to provide integrations with editors such as VSCode, Vim, or Emacs, with features like type inspection, autocomplete, and more. It also has first-class integration with Dune, OCaml's most used build system.

JavaScript Integration

Use existing JavaScript packages from NPM, or your own JavaScript libraries in your projects. With an expressive bindings language, and an ergonomic compilation model, Melange can help you build robust applications that leverage functionality from the JavaScript ecosystem.

Stable and Industry Backed

Melange builds on top of decades of type system research, compiler engineering and tooling development to provide a polished developer experience. Companies like Ahrefs use Melange daily to deploy web applications for their users.