Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Hello, I am implementing Kratos for my Nextjs app. Now I want to authenticate an API that I wrote in Express, and I wanted to know what the guide would be or what I should use to start implementing API authentication and validating users.