Check user auth in api request

backend/middleware/auth.js

@@ -0,0 +1,21 @@
+const jwt = require('jsonwebtoken');
+const { defaultDangerKey } = require('../routes/auth/authSettings');
+
+function verifySinedIn(req, res, next) {
+  const token = req.header('Authorization');
+  const secretKey = process.env.SECRET_KEY || defaultDangerKey;
+
+  if (!token) {
+    return res.status(401).json({ error: 'Access denied' });
+  }
+
+  try {
+    const decoded = jwt.verify(token, secretKey);
+    req.userId = decoded.userId;
+    next();
+  } catch (error) {
+    res.status(401).json({ error: 'Invalid token' });
+  }
+}
+
+module.exports = { verifySinedIn };