How to serialize to TOML with serde

Use toml::to_string() or toml::to_string_pretty() from the toml crate to serialize a struct into a TOML string. Ensure your struct derives serde::Serialize.

use serde::Serialize;

#[derive(Serialize)]
struct Config {
    name: String,
    value: u32,
}

fn main() {
    let config = Config { name: "test".to_string(), value: 42 };
    let toml_str = toml::to_string(&config).unwrap();
    println!("{}", toml_str);
}

Add toml = "0.8" and serde = { version = "1.0", features = ["derive"] } to your Cargo.toml.

Serializing to TOML with serde converts your Rust data structures into a TOML text format, which is commonly used for configuration files. It works like saving a document: you take your in-memory data and write it out as a readable text file that other programs can understand. You use this when you need to save settings or generate configuration files for your application.