If running this bot on your own client blockchain full node, expose the http port to 8545 and wss port to 8546.
Otherwise if using Alchemy, Infura, QuickNode etc as an API, insert those http and wss addresses instead in main.js.
git clone https://github.com/CryptoWizardsNet/mempool-listener.git memlisten
cd memlisten
yarn
or
npm ci
node main.js