I have a node.js app running on replit, and I have 24x7 pinging it, but the http port doesn't stay on

Question

I have a node.js app running with express as an http port, and have two external services, uptimerobot and 24x7 pinging it, but it refuses to stay on. What is going on? If I run the project on replit, it works fine but pinging the URL does not work (replit gives you a subdomain to host your project on)