database.rules.json

{
  "rules": {
    ".read": false,
    ".write": "auth !== null",
    "users": {
      "$user_id": {
        ".read": "$user_id === auth.uid",
        ".write": "$user_id === auth.uid",
        "fullname": {
          ".validate": "newData.isString()"
        },
        "email": {
          ".validate": "newData.isString()"
        },
        "address": {
          ".validate": "newData.isString()"
        },
        "mobile": {
          ".validate": "newData.isString()"
        },
        "avatar": {
          ".validate": "newData.isString()"
        },
        "banner": {
          ".validate": "newData.isString()"
        },
        "dateJoined": {
          ".validate": "newData.isString()"
        }
      }
    },
    "products": {
      ".read": true,
      ".write": false,
      "$product_id": {
        "name": {
          ".validate": "newData.isString()"
        },
        "description": {
          ".validate": "newData.isString()"
        },
        "price": {
          ".validate": "newData.isNumber()"
        },
        "brand": {
          ".validate": "newData.isString()"
        },
        "image": {
          ".validate": "newData.isString()"
        },
        "maxQuantity": {
          ".validate": "newData.isNumber()"
        },
        "quantity": {
          ".validate": "newData.isNumber()"
        },
        "dateAdded": {
          ".validate": "newData.isNumber()"
        }
      }
    }
  }
}