diff --git a/auth_api/index.js b/auth_api/index.js
index 2306be5..d453b77 100644
--- a/auth_api/index.js
+++ b/auth_api/index.js
@@ -87,12 +87,21 @@ app.post("/login", async (req, res) => {
     if (!ok) return res.status(401).json({ error: "invalid_credentials" });
 
     const isAdmin = ADMIN_USER_CODES.has(Number(user.usercode));
-    const payload = { userId: user.id, userCode: user.usercode, isAdmin };
+    const payload = {
+      userId: user.id,
+      userCode: user.usercode,
+      isAdmin: Boolean(isAdmin),
+    };
     const token = jwt.sign(payload, JWT_SECRET, { expiresIn: "1h" });
 
     res.json({
       token,
-      user: { id: user.id, userCode: user.usercode, job: user.job, isAdmin },
+      user: {
+        id: user.id,
+        userCode: user.usercode,
+        job: user.job,
+        isAdmin: Boolean(isAdmin),
+      },
     });
   } catch (err) {
     await reportError({
diff --git a/error_log_api/index.js b/error_log_api/index.js
index b27b49e..d557460 100644
--- a/error_log_api/index.js
+++ b/error_log_api/index.js
@@ -9,9 +9,9 @@ const app = express();
 app.use(express.json({ limit: "64kb" }));
 app.use(cors());
 
-const PORT = Number(process.env.PORT || 5003);
-const JWT_SECRET = process.env.JWT_SECRET || "";
-// Admin verification is done by `auth_api` and carried in the JWT as `isAdmin`.
+const ERROR_LOG_API_URL =
+  process.env.ERROR_LOG_API_URL ||
+  "https://error.xtransit.testinstance.nl/error_log";
 
 function toFriendlyError(statusCode) {
   if (statusCode === 400) return "Controleer je invoer en probeer opnieuw.";
@@ -21,6 +21,40 @@ function toFriendlyError(statusCode) {
   return "Er ging iets mis. Probeer het later opnieuw.";
 }
 
+async function reportError({ partofservice, error }) {
+  try {
+    await fetch(ERROR_LOG_API_URL, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        service: "error_log_api",
+        partofservice,
+        error,
+      }),
+    });
+  } catch (_) {}
+}
+
+app.use((req, res, next) => {
+  const originalJson = res.json.bind(res);
+  res.json = (body) => {
+    if (res.statusCode >= 400 && body && typeof body === "object") {
+      const rawError =
+        body.error || body.message || body.details || `HTTP ${res.statusCode}`;
+      void reportError({
+        partofservice: `${req.method} ${req.originalUrl}`,
+        error: rawError,
+      });
+      return originalJson({ error: toFriendlyError(res.statusCode) });
+    }
+    return originalJson(body);
+  };
+
+  next();
+});
+
+const PORT = Number(process.env.PORT || 5003);
+
 function normalizeErrorText(value) {
   if (!value) return "Unknown error";
   if (typeof value === "string") return value;
@@ -58,7 +92,7 @@ function verifyAdmin(req, res, next) {
 
   try {
     const payload = jwt.verify(auth.slice(7), JWT_SECRET);
-    if (!payload?.user.isAdmin) {
+    if (!payload?.isAdmin) {
       return res.status(403).json({ error: toFriendlyError(403) });
     }