Building a Production-Ready REST API with Fastify

H
ey Devs 👋

Are you planning to create a REST API using Fastify? Here is the step-by-step guide on how to create a CRUD operation in an industry-standard way.
In this series we are going to cover end-to-end API creation, error handling, and security.

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Folder structure is the first way for proper coding.

```
src/
  config/     
          env.ts (validated env vars), 
          db.ts (mongoose connect/disconnect)
  models/     
          one file per Mongoose model
  schemas/    
          one Zod file per module (create/update input validation)
  utils/      
          errors.ts (AppError subclasses), 
          jwt.ts.
  plugins/    
          auth.ts (Fastify plugin: authenticate/authorize/can decorators)
  modules/    
          one folder per resource, e.g. modules/courses/course.routes.ts
  app.ts      
          builds the Fastify instance: plugins -> routes -> error handler
  server.ts   
          entrypoint: connect DB, app.listen, graceful shutdown
```