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Fable: Compile F# to Multiple Languages

Name: Fable: Compile F# to Multiple Languages
Author: fable-compiler

Get multi-language support with Fable. For founders using F#.

3,125 stars328 forksF#Quality 8/10Updated 7/6/2026100% free · open source

What it does

Fable compiles F# code into JavaScript, TypeScript, Python, Rust, Erlang, and Dart, allowing founders to use F# for multi-language support across different projects and platforms.

Install / run

dotnet tool install -g fable

When to use it

•When building web applications that require both F# and JavaScript interoperability
•When creating cross-platform desktop applications using F# and targeting multiple languages
•When integrating F# with other language ecosystems, such as Python or Rust, for machine learning or data science tasks

Quick start

1Create a new F# project using `dotnet new console -lang F#`
2Install the Fable compiler using `dotnet tool install -g fable` and then `dotnet fable add` to add Fable to the project
3Configure the `fable_config.json` file to specify the target language, such as `{ "target": "JavaScript" }`
4Run `dotnet fable` to compile the F# code into the target language
5Use the compiled output in the target language, such as including the generated JavaScript file in a web page

Ready-to-paste prompt

dotnet fable --lang JavaScript --out output.js Program.fs

Heads up: Fable requires the .NET Core 3.1 or later runtime to be installed, and the F# compiler version must be compatible with the target language

Saves to your device

Topics

beam

dart

erlang

fsharp

javascript

python

rust

typescript

What's inside — free to inspect

No purchase needed

Read the entire source before you build — unlike paid marketplaces that hide it behind a buy button.

top-level files

folders

430.2M

repo size

MIT

license

Key files

.editorconfig

AGENTS.md

package.json

pyrightconfig.ci.json

pyrightconfig.json

README.md

File tree

.claude/

.config/

.devcontainer/

.github/

.husky/

.vscode/

lib/

src/

tests/

tests_external/

.editorconfig

.fantomasignore

.gitattributes

.gitignore

.markdownlint.json

.markdownlintignore

AGENTS.md

build_old.fsx

build.bat

build.sh

CLAUDE.md

fable_logo.png

Fable.sln

Fable.Standalone.sln

Quick Actions

Details

Creator

fable-compiler

Language

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