If the web application accepts the request and returns the response, it is reasonable to express it with a function. Indeed, applications are arbitrarily complex. But they accept the request and return the response, so at the abstract level, it is a function.

A router is also a function that accepts a request, determines the necessary handler, and returns a response.

A request handler is a function that accepts a request and returns a response. The middleware technique is best suited to add intermediate logic, such as query parameters, sessions, cookies, access rights.

Middleware is also a function that accepts a handler function and returns a new handler with augmented logic. Also, each middleware can break the chain, depending on the circumstances. Pattern decorator is a special case of Middleware. Therefore, our middleware is a bit different from those that are taken in Express.

Each heavy abstraction will replace by a function. This is convenient because, unlike classes, functions are composable.

Manages the lifecycle of the HTTP server. There are two functions that control the lifecycle of the application, these are the startServer and the stopServer functions respectively.

Responsible for aggregating all the routes and wrapping them with any necessary middleware.

This folder is reserved for any wrapper functions that are used to modify the requests and responses. The main purpose of the middleware is to provide a central place for handling common tasks such as request validation. Middleware is just a wrapper (decorator) for the request handler.

Aggregates the routes for handling all the requests to our application. All routes handlers are there.

Core functionality

.
├── LICENSE
├── README.md
├── lib
│   ├── api
│   │   └── books
│   │       └── index.js
│   ├── app.js
│   ├── config
│   │   ├── index.js
│   │   ├── schema.js
│   │   └── validate.js
│   ├── logger.js
│   ├── middleware
│   │   ├── __test__
│   │   │   └── wrap-json-body.unit.test.js
│   │   ├── index.js
│   │   ├── wrap-api-handler.js
│   │   ├── wrap-catch-error.js
│   │   └── wrap-json-body.js
│   ├── routes
│   │   ├── health-check.js
│   │   ├── index.js
│   │   └── not-found.js
│   ├── server.js
│   └── util
│       └── fkit
│           └── index.js
├── package-lock.json
└── package.json

• Clone the repository

git clone https://github.com/igat64/micro-template.git

• Install the dependencies

npm install

• Start the microservice

npm start

• Start in Development mode

npm run start:dev