Learn Firebase Cloud Funtions & How to Deploy in your Project: Resource link :- https://firebase.google.com/docs/functions/get-started Use Firebase Emulator to Make easy Deployement: Setup 1] Initialize the Firebase Emulator open the terminal, and navigate to our project’s root folder run below command 2] Emulator setup depending on your project needs click space key to select Emulator click Enter to select default option 3] Use Emulator UI run below command 4] Show Firebase Emulator also emulator provide functions api link which you want to trigger, click link to see response of api Use REST Client Extension in VS Code IDE to make easy to send GET, POST, DELETE, PUT Request: setup 1] first create rest.http folder into functions folder 2] how to write different type of api check my repo:- https://github.com/22chiragmodh/cloudfun-firebase and check rest.http folder which is inside in functions folder.