How to use toml crate in Rust TOML parser

Add the toml crate to your Cargo.toml dependencies and use toml::from_str to parse TOML strings into Rust structs.

[dependencies]
toml = "0.8"

use serde::Deserialize;

#[derive(Deserialize)]
struct Config {
    title: String,
    edition: String,
}

fn main() {
    let toml_str = r#"
        title = "The Rust Programming Language"
        edition = "2024"
    "#;
    let config: Config = toml::from_str(toml_str).unwrap();
    println!("{}", config.title);
}

Note: You must also add serde = { version = "1.0", features = ["derive"] } to your dependencies to enable the Deserialize derive macro.

The toml crate lets your Rust program read configuration files written in TOML format, which is a simple text format often used for settings. It works by converting the text in the file into structured Rust data types that your code can use directly. Think of it like a translator that turns a human-readable recipe into a set of instructions your computer can follow.