add eslinting, fix linting issues

package.json

@@ -11,5 +11,15 @@
 		"cors": "^2.8.5",
 		"express": "^4.18.2",
 		"morgan": "^1.10.0"
+	},
+	"devDependencies": {
+		"eslint": "^8.43.0",
+		"eslint-config-standard": "^17.1.0",
+		"eslint-plugin-import": "^2.27.5",
+		"eslint-plugin-n": "^16.0.1",
+		"eslint-plugin-promise": "^6.1.1"
+	},
+	"scripts": {
+		"lint": "eslint --fix src/*.js"
 	}
-}
+}