Todo App API built using

• express & mongodb atlas (mongoose as ODM)
• zod (validation library)

this app has the following features

• crud ops :

  • get all todos,
  • get single todo,
  • mark a todo as completed
  • create a todo update a todo,
  • delete a todo
  • delete many todos

• error handling middleware

• validation layer built using zod

Folder structure :

• models : mongoose schema for todoModel
• middlewares
  • asyncwrapper.js : async wrapper (to avoid repeating try-catch blocks in every endpoint).
  • errorHandler.js : catch errors (general & specific).
• index.js : entry point for the app
• types.js : zod validations
• db
  • connect.js : connect to mongodb atlas
• .env : environment variables
• errors : class definition for - CustomApiError - InvalidInputError

important concepts :

• middleware chaining
• global catch for errors
• validation layer using zod
  • customizing validation with .refine() method (see : ./types.js)
• crud ops on mongodb
• schema creation with mongoose