me and my co-founder #buildinpublic #100DaysOfCode

✅ Why Promise is used Handle async work → network requests, DB queries, etc. Avoid callback hell → cleaner, chainable syntax. Error handling → .catch() or try/catch with async/await. Consistency → every async function always returns a Promise in modern JS.

What is an interface in TypeScript? An interface is like a blueprint (or contract) that defines the shape of an object. It doesn’t hold data itself, it only describes what properties and types the object must have.

✅ In short: An interface in TypeScript defines the structure (shape) that an object must follow. It’s like saying: “Any object of this type must have these properties and methods.”

Swagger is a framework for describing, documenting, and testing RESTful APIs. It makes it easier for developers to design, build, and consume APIs by providing a standardized way to describe them. Swagger uses a specification format called OpenAPI Specification (OAS).

OpenAPI/Swagger Specification A JSON or YAML file that describes your API — its endpoints, request/response formats, parameters, authentication methods, etc.

Swagger UI An interactive web-based interface that automatically generates documentation from your OpenAPI spec. Developers (or even non-developers) can see all available endpoints and try them out directly from the browser without writing extra code.

Swagger Codegen A tool that can generate client libraries, server stubs, and API documentation in multiple programming languages directly from the API spec.

👉 In short: Swagger = tools + ecosystem. OpenAPI = the standard (originally called Swagger Specification).