How can I rename the Firebase Project ID?

firebaser here

There is no way to change the project ID of a project.

You can just delete the current project, make a new project, download its google-services.json file and replace it with the current one in your app folder then finally you'll have to clean your project from Build -> CleanProject! That's it!

You can refer to this doc

https://support.google.com/cloud/answer/6158840?hl=en

The project ID is a unique identifier for a project. When you first create a project, you can accept the default generated project ID or create your own. A project ID cannot be changed after the project is created, so if you are creating a new project, be sure to choose an ID that you'll be comfortable using for the lifetime of the project.

I had to Delete my project and Create a new one.

How to Delete : Settings -> Permissions -> All Projects

How to Create here.

Do not forget running:

firebase use --add from your project dir, and test both:

firebase serve and

firebase deploy.