It’s entirely possible to run local server without an Internet connection. In fact, you can do it without a router, wireless access point etc if you wish. See this topic:
@ajitnayak87 if you want others to help you with your problem then your communication needs to be much clearer and more detailed. You need to explain your network architecture in detail, and show how you’ve set-up your app, including which port you’ve chosen in your app configuration.