Language Support

Hop uses Nixpacks for automatic, configless deployments. You can write a custom Dockerfile if you don’t want to use Nixpacks.

Rust is detected if a Cargo.toml file is found in your project root. Hop builds your project using cargo build --release and then deploys and executes the resulting binary.


Hop supports all Rust versions. By default, the latest version is used, however it can be overriden by either:

  • The rust-version property in Cargo.toml,
  • Setting the NIXPACKS_RUST_VERSION environment variable, or
  • A rust-toolchain.toml file


Hop will automatically detect if you are using Cargo Workspaces.

This checks workspace.default_members first and then workspace.members. It also respects the workspace.exclude field.

To set which workspace Hop will build, just set the NIXPACKS_CARGO_WORKSPACE environment variable and Hop will use it as the --package argument.