MedianPrimes

With server and client running, user enters a number into the textbox and clicks "Submit". Prime numbers lesser than or equal to the entered number are calculated on the server, and the median array element(s) are returned to the client.

Uses Sieve of Eratosthenes for calculating primes.

E.g. user enters 10, so 2,3,5,7 are primes which means 3,5 are returned.

Stack

Backend: Express.js/Node.js

Frontend: HTML, CSS, JavaScript, React

Errors

Most errors occur when there is bad input or the server isn't running. These errors come in the form of HTTP code 400 (Bad Request). If the number entered is too large, too small, or negative, the error message lets the user know that the number entered doesn't have any valid primes.

Otherwise, i.e. with the server not running, a standard "Bad Request" error message is displayed.

Requirements and Setup

npm package manager
Run npm install to install package.json packages
Run npm start from root directory, and node server.js from the src/server/ directory

About the Code

The code is 100% commented, so feel free to peruse!

Screenshots

Server:

Client: