How to Use Workspaces to Organize Multi-Crate Projects

Use a Cargo workspace to group multiple crates under a single root Cargo.toml for shared dependencies and unified builds. Create a root Cargo.toml with a [workspace] section and list your member crates in the members array.

[workspace]
members = [
    "my-library",
    "my-binary",
]

Ensure each member crate has its own Cargo.toml in its subdirectory and remove the version field from the root Cargo.toml if it exists.

A Cargo workspace is like a project folder that holds several related sub-projects together. It lets you build, test, and manage dependencies for all of them at once from a single command. Think of it as a single umbrella for a family of code that needs to work together.