jwks-rsa is a Node.js library for retrieving RSA JSON Web Keys (JWKS) from a remote endpoint. It's commonly used to verify JSON Web Tokens (JWTs) issued by identity providers like Auth0 or AWS Cognito. The library caches the JWKS for performance, reducing the need to repeatedly fetch them. jwks-rsa simplifies JWT verification by automating the key retrieval process, making your applications more secure and robust.