If config file is not edited, it will give error.

events/ready.js

 const config = require('../config.json');
 module.exports = {
     ready: (client) => {
+        if (config.token == "TOKEN") {
+            console.warn(`You need to edit config file before running.`);
+            process.exit(1);
+        };
         client.login(config.token).catch(e => {
             console.warn(`An error occurred while connecting to Discord ${e}`);
             process.exit(1);

package.json

@@ -4,7 +4,8 @@
   "description": "",
   "main": "main.js",
   "scripts": {
-    "start": "node main.js"
+    "start": "node main.js",
+    "test": "node main.js"
   },
   "repository": {
     "type": "git",