reasonml/reason

Health v2 · maintenance only

Adoption not part of the score

10323 stars · 436 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Reason is an alternative syntax and toolchain for the OCaml programming language, offering simple, fast, type-safe code with a JavaScript-friendly surface. It includes the refmt formatter and compiles to native or JavaScript (via Melange), leveraging both the OCaml and JavaScript ecosystems.

Use cases

• write type-safe code with OCaml semantics but friendlier syntax
• compile OCaml-like code to JavaScript
• format Reason source files with refmt
• learn functional programming with strong type inference
• build web frontends using OCaml ecosystem libraries

When to choose

• you want OCaml's type system with a simpler, JS-like syntax
• you are maintaining an existing Reason/ReasonReact codebase
• you want to target both native OCaml and JavaScript from one language

When to avoid

• you are starting a new project today - ReScript or plain OCaml are more actively developed
• you need a large ecosystem of language tooling and community support
• you want dynamic typing or rapid prototyping without type constraints

Facets

library · maturity maintenance

programming-language compiler formatter type-system programming-languages compilers web-development developer-tools cross-platform cli reasonml ocaml-syntax melange refmt alt-syntax functional-programming type-safe javascript ocaml nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="reasonml/reason")