Angular 18 Installing json-server have this error File db.json not found

I am doing an Dummy Angular 18 Application. I am using Visual Code, and Node version v20.18.0

I am trying to install Json Server, so first I run the command npm install json-server

In package.json have the line "json-server": "^1.0.0-beta.3",

But when I want to install the json.db running the command

json-server --watch db.json
or
npx json-server --watch db.json


I got this error

--watch/-w can be omitted, JSON Server 1+ watches for file changes by default
File db.json not found

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