Auth.js Compatibility

FastAPI and Auth.js can work together, but they require careful architectural planning since Auth.js is designed for JavaScript frameworks and FastAPI is a Python backend.

Auth.js is designed for JavaScript frameworks and doesn't natively support Flask, but you can use them together by treating Flask as a backend API and running Auth.js in a separate frontend application.

Django and Auth.js can work together, but you're mixing a Python backend with a JavaScript auth library designed for JavaScript frameworks—it requires building a custom integration layer.

Auth.js can be used with NestJS, but it requires manual integration since Auth.js is primarily designed for Next.js and edge runtimes.

Auth.js is JavaScript-first and designed for frontend frameworks; using it with Rails requires building a separate Next.js/React frontend or implementing custom backend bridges.