Authentication is a fundamental pillar within the entire software stack, playing a critical role in ensuring the protection and integrity of systems. Managing credentials with the utmost security is imperative, as this safeguards sensitive information and maintains user trust. The process of authentication not only verifies the users but also establishes a secure environment where data can be accessed and shared safely.
JWTs are compact, self-contained tokens that securely transmit information between parties as JSON objects. They excel in stateless authentication, microservices architectures, and API authorization. While offering benefits like scalability and cross-domain compatibility, JWTs require careful implementation to address security concerns around token management and revocation.
Signing up or logging in to apps with OAuth is the easiest. While using Auth.js or a simplified solution is more accessible, I think it is still best to understand what is happening under the hood.
https://aaronparecki.com/oauth-2-simplified/
https://www.digitalocean.com/community/tutorials/an-introduction-to-oauth-2