This project developed by using TDD 1. express -> web framework for node 2. body-parser -> middleware to handle incoming requests as JSON 3. mocha -> test framework 4. chai -> assertion library for mocha 5. chai-http -> to send requests for our API from our tests 6. jsonwebtoken -> to generate JWT 7. morgan -> logging coming requests 8. nodemon -> to auto restart server automatically when files change (optional)