parse jwt tokens in rust

main.rs
use jsonwebtoken::{decode, DecodingKey, Validation};

fn parse_jwt_token(token: &str, secret: &str) -> Result<(), String> {
    // Define the decoding key and validation parameters
    let decoding_key = DecodingKey::from_secret(secret.as_ref());
    let validation = Validation::default();

    // Decode the token and extract its payload data
    match decode::<HashMap<String, String>>(&token, &decoding_key, &validation) {
        Ok(payload) => {
            // Token is valid, extract data from payload
            let user_id = payload["sub"].parse::<i32>().unwrap();
            let user_role = payload["role"].to_string();
            println!("User {} has role {}", user_id, user_role);
            Ok(())
        },
        Err(err) => {
            // Token is invalid
            Err(format!("Failed to decode JWT token: {}", err))
        }
    }
}

fn main() {
    let token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c";
    let secret = "secret_key";
    parse_jwt_token(token, secret).unwrap();
}
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