Unexpected error when deploying webapp on firebase

I try to host my static Website on Firebase. I run through the tutorial on the official Firebase site.

I tried to deploy it, changed the firebase.json file, but nothing helped

"hosting": {
  "public": "public", 
  "ignore": [
    "firebase.json",
  ]
}

this is my firebase.json file

this is the error message when I run firebase deploy:

mp@linux:~/Documents/Website/Codebytessoftware$ firebase deploy

Error: There was an error loading firebase.json:

Unexpected token ':' at 1:10
"hosting": {
         ^
File: "/home/mp/Documents/Website/Codebytessoftware/firebase.json"

Having trouble? Try firebase deploy --help