Added linter for json files and fixed newly created linting errors.

eslint.config.js

@@ -1,6 +1,7 @@
 import eslint from "@eslint/js";
 import eslintConfigPrettier from "eslint-config-prettier";
 import eslintPluginVue from "eslint-plugin-vue";
+import jsonc from "eslint-plugin-jsonc";
 import globals from "globals";
 import typescriptEslint from "typescript-eslint";
 
@@ -26,5 +27,9 @@ export default typescriptEslint.config(
       "@typescript-eslint/no-require-imports": "off",
     },
   },
+  {
+    files: ["**/*.json"],
+    extends: [...jsonc.configs["flat/recommended-with-json"]],
+  },
   eslintConfigPrettier
 );