How to Use the log Crate in Rust

Add the log crate to your dependencies and initialize a logger in your main function before using any logging macros.

[dependencies]
log = "0.4"
env_logger = "0.10"

use log::info;

fn main() {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info"))
        .init();
    info!("Application started");
}

Note: You must also add env_logger to your dependencies to handle the initialization.

The log crate is a standard way to add diagnostic messages to your Rust programs without tying yourself to a specific output format. You add it to your project, set up a simple handler to decide which messages to show, and then use macros like info! to print messages. It works like a universal remote that lets different logging tools control your program's output.