56 releases (27 breaking)

new 0.55.0 Apr 18, 2024
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0.52.0 Mar 27, 2024
0.48.1 Dec 6, 2023
0.31.3 Nov 30, 2022

#1008 in Magic Beans

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2,940 downloads per month
Used in 19 crates (12 directly)


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build crates.io docs discord

Sway is a language developed for the Fuel blockchain. It is heavily inspired by Rust and aims to bring modern language development and performance to the blockchain ecosystem.


For user documentation, including installing release builds, see the Sway Book: https://fuellabs.github.io/sway/latest/.

For Sway Standard library documentation, see: https://fuellabs.github.io/sway/master/std/

Also view the technical reference for the Sway programming language: https://fuellabs.github.io/sway/master/reference/

Building from Source

This section is for developing the Sway compiler and toolchain. For developing contracts and using Sway, see the above documentation section.


Sway is built in Rust. To begin, install the Rust toolchain following instructions at https://www.rust-lang.org/tools/install. Then configure your Rust toolchain to use Rust stable:

rustup default stable

If not already done, add the Cargo bin directory to your PATH by adding the following line to ~/.profile and restarting the shell session.

export PATH="${HOME}/.cargo/bin:${PATH}"

Building Forc

Clone the repository and build the Sway toolchain:

git clone git@github.com:FuelLabs/sway.git
cd sway
cargo build

Confirm the Sway toolchain built successfully:

cargo run --bin forc -- --help

Contributing to Sway

We welcome contributions to Sway!

Please see the Contributing To Sway section of the Sway book for guidelines and instructions to help you get started.


Utility items shared between forc crates.


~109K SLoC