How to Compile Rust to WebAssembly

Add the wasm32-unknown-unknown target to your Rust toolchain, create a library crate, and compile it using cargo build --target wasm32-unknown-unknown.

rustup target add wasm32-unknown-unknown
cargo new --lib my-wasm-app
cd my-wasm-app
cargo build --target wasm32-unknown-unknown --release

The compiled WebAssembly file will be located at target/wasm32-unknown-unknown/release/my_wasm_app.wasm.

Compiling Rust to WebAssembly converts your code into a special format that web browsers can run directly. It is like translating a book from English into French so that French speakers can read it. You use this when you want to run high-performance Rust logic inside a website without needing a backend server.