fastify-oas
OpenAPI 3.0+ (OAS3) documentation generator for Fastify. It uses the schemas you declare in your routes to generate a swagger compliant doc.
This plugin based on fastify-swagger that generates swagger 2.0 spec.
This plugin designed in such way to be compatible with it's predcessor and in most cases if you already use fastify-swagger you may just replace it with current plugin and it should work.