add GET /api/users/:id

backend/src/api.js

@@ -101,6 +101,39 @@ router.get("/healthcheck", async (req, res) => {
   }
 });
 
+/**
+ * @swagger
+ * /api/users/{id}:
+ *   get:
+ *     summary: Get a user by ID
+ *     parameters:
+ *       - name: id
+ *         in: path
+ *         required: true
+ *         schema:
+ *           type: integer
+ *     responses:
+ *       200:
+ *         description: User data
+ *         content:
+ *           application/json:
+ *             example:
+ *               id: 1
+ *               username: "john_doe"
+ *       400:
+ *         description: Invalid user ID
+ *       404:
+ *         description: User not found
+ */
+router.get("/users/:id", asyncHandler(async (req, res) => {
+    const userId = parseInt(req.params.id, 10);
+    if (isNaN(userId)) throw new ApiError(400, "Invalid user ID");
+
+    const [rows] = await pool.query("SELECT * FROM users WHERE id = ?", [userId]);
+    if (!rows.length) throw new ApiError(404, "User not found");
+
+    res.json(rows[0]);
+}));
 
 /**
  * @swagger