How to use anyhow crate in Rust error handling

Use anyhow to simplify error handling by returning a generic Result<T, anyhow::Error> type instead of defining custom error enums. Add the crate to your Cargo.toml, import anyhow and Result, and use the anyhow! macro to create errors from strings or the ? operator to propagate them automatically.

use anyhow::{anyhow, Result};

fn read_config() -> Result<String> {
    // Propagate errors with ?
    let content = std::fs::read_to_string("config.txt")?;
    
    // Create a custom error if needed
    if content.is_empty() {
        return Err(anyhow!("Config file is empty"));
    }
    
    Ok(content)
}

In your Cargo.toml, ensure you have the dependency:

[dependencies]
anyhow = "1"

The anyhow crate acts as a universal error type that lets you skip the tedious work of defining your own error structures for every function. It allows you to focus on writing logic rather than error plumbing, automatically converting different error types into a single format you can handle at the top level. Think of it as a universal adapter that lets any error plug into your code without needing a custom socket.