So I replaced ExpressJS with Fastify, but my problem is Nest-Passport doesn't support fastify, do we have an alternative for Nest-Passport? or any solutions on how to secure RestAPI in nestJS using a token?
There's no immediate Fastify NestJJS authentication package I'm aware of (I'm sure there's something out there), but I do have a sample of JWT authentication with Fastify and NestJS without Passport. The idea is to make use of Nest's @nestjs/jwt package or just jsonwebtoken directly, and create the auth tokens with that instead of delegating to Passport. This is actually the kind of approach I prefer, as I find Passport to be a bit too mystical sometimes.