railway.app: POST / FETCH problem

Job ID: 35849215

Budget: $10 – $30 USD

Need assistance with the problem of getting my app working. It's working on localhost but I cannot make it work on the railway.app. Here are screenshots of the problem:
https://prnt.sc/Xs_0iK_hq8kl
https://prnt.sc/kdu7gbsrOjte

Related categories: JavaScript Node.js Express JS React.js