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Coursework

Exercises to practice and solidify your understanding of the Decomposition module of the Software Development Course.

Overview

This repo contains two small Express apps that both implement the same /subjects POST endpoint, but in different ways:

  • custom-middlewares/ uses custom middleware for header extraction and JSON array parsing.
  • off-the-shelf-middleware/ uses Express built-in JSON parsing plus a custom validator.

Both apps respond with an authentication message based on the X-Username request header and validate that the request body is a JSON array of strings.

Custom middlewares app

Location: custom-middlewares/

Middleware:

  • extractUsername reads X-Username and sets req.username.
  • parseJsonArrayBody manually parses the JSON body and ensures it is an array of strings.

Run tests:

cd custom-middlewares
npm install
npm test

Off-the-shelf middleware app

Location: off-the-shelf-middleware/

Middleware:

  • express.json() parses JSON bodies.
  • extractUsername reads X-Username and sets req.username.
  • validateJsonArray checks the parsed body is an array of strings.

Run tests:

cd off-the-shelf-middleware
npm install
npm test

Endpoint behavior

POST /subjects

  • Body must be a JSON array of strings.
  • If X-Username is present: responds with You are authenticated as <name>.
  • If X-Username is missing: responds with You are not authenticated.