I am using create-react-app and hosting in its default port localhost:3000 and want to access this from another device on the same net
If you are on windows and the above solutions don't work, it is most probably a firewall issue. You can try looking in Allowed Applications in Control Panel, to check if node is allowed on private networks. Or looking in the Windows Defender Firewall with Advanced Security and checking the Monitoring\Firewall tab and check for Node.js.