diff --git a/src/middlewares/authorize.js b/src/middlewares/authorize.js
index 17e1bd7..bc3fdc1 100644
--- a/src/middlewares/authorize.js
+++ b/src/middlewares/authorize.js
@@ -4,18 +4,48 @@ import Stats from '../models/schemas/Stat.js';
 
 /**
  * Middleware for handling user authentication and request validation.
+ *
+ * @function
  * @param {string} requiredRole - The required role to access the endpoint.
  * @returns {function} - Express middleware function.
+ * @throws {Error} Throws an error if there is an issue with authentication or validation.
+ *
+ * @error {400} Bad Request - User has not provided a valid token.
+ * @error {401} Unauthorized - User has provided an invalid API key.
+ * @error {403} Forbidden - User is banned, request limit is exhausted, or insufficient privileges.
  */
-const authorize = (requiredRole) => async (req, res, next) => {
+const authorize = requiredRole => async (req, res, next) => {
   try {
-    // Extract API key from request headers
+    /**
+     * Extract API key from request headers.
+     *
+     * @type {string}
+     */
     const key = req.headers.authorization;
 
-    // Verify if the API key exists in the database
+    /**
+     * Handle case where the user has not provided a valid token.
+     */
+    if (!key) {
+      await incrementSystemStats({
+        endpoints_requests: 1,
+        daily_requests: 1,
+      });
+      return next(createError(400, 'Bad Request. Go to https://docs.waifu.it for more info.'));
+    }
+
+    /**
+     * Verify if the API key exists in the database.
+     *
+     * @type {Object|null}
+     */
     const userData = await Users.findOne({ token: key });
 
-    // Update request quotas and count
+    /**
+     * Update request quotas and count.
+     *
+     * @type {Object}
+     */
     const updateData = {
       $inc: {
         req_quoto: userData && userData.req_quoto > 0 ? -1 : 0,
@@ -24,22 +54,21 @@ const authorize = (requiredRole) => async (req, res, next) => {
     };
     await Users.updateOne({ token: key }, updateData);
 
-    // Handle case where the user has not provided a valid token
+    /**
+     * Handle case where the user has not provided a valid token.
+     */
     if (!userData) {
       await incrementSystemStats({
         failed_requests: 1,
         endpoints_requests: 1,
         daily_requests: 1,
       });
-      return next(
-        createError(
-          401,
-          'Invalid API key. Go to https://docs.waifu.it for more info.'
-        )
-      );
+      return next(createError(401, 'Invalid API key. Go to https://docs.waifu.it for more info.'));
     }
 
-    // Handle case where the user is banned
+    /**
+     * Handle case where the user is banned.
+     */
     if (userData.banned) {
       await incrementSystemStats({
         banned_requests: 1,
@@ -49,42 +78,50 @@ const authorize = (requiredRole) => async (req, res, next) => {
       return next(createError(403, "You've been banned from using the API."));
     }
 
-    // Handle case where the request limit is exhausted [Currently Disabled]
+    /**
+     * Handle case where the request limit is exhausted.
+     */
     if (userData.req_quoto <= 0) {
-      return next(
-        createError(
-          403,
-          "You've exhausted your request limits. Buy Premium to increase it more."
-        )
-      );
+      return next(createError(403, "You've exhausted your request limits. Buy Premium to increase it more."));
     }
 
-    // Check if the user has the required role
+    /**
+     * Check if the user has the required role.
+     */
     if (!userData.roles.includes(requiredRole)) {
       return next(createError(403, 'Insufficient privileges to access this endpoint.'));
     }
 
-    // Increment system stats for successful requests
+    /**
+     * Increment system stats for successful requests.
+     */
     await incrementSystemStats({
       endpoints_requests: 1,
       success_requests: 1,
       daily_requests: 1,
     });
 
-    // Call the next middleware
+    /**
+     * Call the next middleware.
+     */
     return next();
   } catch (error) {
-    // Pass any caught errors to the error handler
+    /**
+     * Pass any caught errors to the error handler.
+     */
     return next(error);
   }
 };
 
 /**
  * Increment the specified statistics in the system stats collection.
+ *
+ * @function
  * @param {Object} stats - Statistics to be incremented.
  * @returns {Promise<void>} - Resolves when the stats are updated.
+ * @throws {Error} Throws an error if there is an issue with updating statistics.
  */
-const incrementSystemStats = async (stats) => {
+const incrementSystemStats = async stats => {
   await Stats.findByIdAndUpdate({ _id: 'systemstats' }, { $inc: stats });
 };