A feature-rich, highly configurable OpenID Connect ID token verifier in Rust — empowering you to validate ID tokens as easily as this, while handling retries, caching, and more under the hood:

use id_token_verifier::*;
use id_token_verifier::client::*;

#[derive(serde::Deserialize)]
struct MyClaims { 
  sub: String,
  email: Option<String>,
  email_verified: Option<bool>,
}

async fn verify(
  token: &str,
  id_token_verifier: &IdTokenVerifierDefault
) -> Result<MyClaims, IdTokenVerifierError> {
  id_token_verifier.verify(token).await
}

• 🔁 Configurable JWKS caching, including background refresh.
• 🛠 Pluggable retry logic via backoff_config and backon.
• ⚙️ Flexible validation settings.
• 🧩 serde-friendly configuration — load from config files or environment variables, or use the provided config Builders.
• 📈 tracing support via the optional tracing feature flag.

• ✅ Validating Google ID tokens
  Includes full setup for retries, JWKS caching, and validation settings.