Add ESlint

.eslintrc.js

@@ -0,0 +1,26 @@
+module.exports = {
+  env: {
+    jest: true
+  },
+  extends: "airbnb-base",
+  rules: {
+    "comma-dangle": 0,
+    "no-underscore-dangle": 0,
+    "no-param-reassign": 0,
+    "no-return-assign": 0,
+    camelcase: 0,
+    "no-bitwise": ["error", { allow: ["|"] }],
+    "max-len": 0,
+    quotes: [2, "single", "avoid-escape"]
+  },
+  settings: {
+    "import/resolver": {
+      node: {
+        moduleDirectory: [
+          "node_modules",
+          "src" // replace with your app-module-path directory
+        ]
+      }
+    }
+  }
+};

app.js

@@ -1,26 +1,47 @@
-const express = require('express');
-const helmet = require('helmet');
-const api = require('api');
+const express = require("express");
+const helmet = require("helmet");
+const api = require("api");
+const cors = require("cors");
+const morgan = require("morgan");
 
 const app = express();
 
+app.set("trust proxy", "loopback");
+
+// cors
+app.use(cors());
+
+if (process.env.ENVIRONMENT !== "test") {
+  // logger
+  app.use(
+    morgan(
+      '[:date[clf]] ":method :url HTTP/:http-version" :status :res[content-length]'
+    )
+  );
+}
+
+// helmet configurations
 app.use(helmet());
 
-app.use(helmet.referrerPolicy())
-
-app.use(helmet.contentSecurityPolicy({
-  directives: {
-    defaultSrc: ["'self'"]
-  }
-}));
-
-app.use(helmet.featurePolicy({
-  features: {
-    fullscreen: ["'self'"],
-    vibrate: ["'none'"],
-    syncXhr: ["'none'"]
-  }
-}));
+app.use(helmet.referrerPolicy());
+
+app.use(
+  helmet.contentSecurityPolicy({
+    directives: {
+      defaultSrc: ["'self'"]
+    }
+  })
+);
+
+app.use(
+  helmet.featurePolicy({
+    features: {
+      fullscreen: ["'self'"],
+      vibrate: ["'none'"],
+      syncXhr: ["'none'"]
+    }
+  })
+);
 
 app.use(express.json());