diff --git a/public/pages/budget.js b/public/pages/budget.js
index 176d052..81765a6 100644
--- a/public/pages/budget.js
+++ b/public/pages/budget.js
@@ -54,13 +54,21 @@ function addMonths(ym, n) {
 // --------------------------------------------------------
 
 async function loadMonth(month) {
-  const [entriesRes, summaryRes] = await Promise.all([
-    api.get(`/budget?month=${month}`),
-    api.get(`/budget/summary?month=${month}`),
-  ]);
-  state.month   = month;
-  state.entries = entriesRes.data;
-  state.summary = summaryRes.data;
+  try {
+    const [entriesRes, summaryRes] = await Promise.all([
+      api.get(`/budget?month=${month}`),
+      api.get(`/budget/summary?month=${month}`),
+    ]);
+    state.month   = month;
+    state.entries = entriesRes.data;
+    state.summary = summaryRes.data;
+  } catch (err) {
+    console.error('[Budget] loadMonth Fehler:', err);
+    state.month   = month;
+    state.entries = [];
+    state.summary = { income: 0, expenses: 0, balance: 0, by_category: [] };
+    window.oikos?.showToast('Budget konnte nicht geladen werden.', 'danger');
+  }
 }
 
 // --------------------------------------------------------
diff --git a/public/pages/calendar.js b/public/pages/calendar.js
index 526fd55..e8eceba 100644
--- a/public/pages/calendar.js
+++ b/public/pages/calendar.js
@@ -124,8 +124,14 @@ function eventsOnDay(dateStr) {
 // --------------------------------------------------------
 
 async function loadRange(from, to) {
-  const res      = await api.get(`/calendar?from=${from}&to=${to}`);
-  state.events   = res.data;
+  try {
+    const res      = await api.get(`/calendar?from=${from}&to=${to}`);
+    state.events   = res.data;
+  } catch (err) {
+    console.error('[Calendar] loadRange Fehler:', err);
+    state.events = [];
+    window.oikos?.showToast('Termine konnten nicht geladen werden.', 'danger');
+  }
   state.rangeFrom = from;
   state.rangeTo   = to;
 }
diff --git a/public/pages/meals.js b/public/pages/meals.js
index b58d703..560606b 100644
--- a/public/pages/meals.js
+++ b/public/pages/meals.js
@@ -74,9 +74,16 @@ function formatDayDate(dateStr) {
 // --------------------------------------------------------
 
 async function loadWeek(week) {
-  const res = await api.get(`/meals?week=${week}`);
-  state.meals       = res.data;
-  state.currentWeek = getMondayOf(week);
+  try {
+    const res = await api.get(`/meals?week=${week}`);
+    state.meals       = res.data;
+    state.currentWeek = getMondayOf(week);
+  } catch (err) {
+    console.error('[Meals] loadWeek Fehler:', err);
+    state.meals       = [];
+    state.currentWeek = getMondayOf(week);
+    window.oikos?.showToast('Essensplan konnte nicht geladen werden.', 'danger');
+  }
 }
 
 async function loadLists() {
diff --git a/public/pages/notes.js b/public/pages/notes.js
index ebbd079..09ca433 100644
--- a/public/pages/notes.js
+++ b/public/pages/notes.js
@@ -58,8 +58,14 @@ export async function render(container, { user }) {
 
   if (window.lucide) lucide.createIcons();
 
-  const res  = await api.get('/notes');
-  state.notes = res.data;
+  try {
+    const res  = await api.get('/notes');
+    state.notes = res.data;
+  } catch (err) {
+    console.error('[Notes] Laden fehlgeschlagen:', err);
+    state.notes = [];
+    window.oikos?.showToast('Notizen konnten nicht geladen werden.', 'danger');
+  }
   renderGrid();
 
   _container.querySelector('#notes-add-btn').addEventListener('click', () => openModal({ mode: 'create' }));
diff --git a/public/pages/shopping.js b/public/pages/shopping.js
index 6e30a29..c81636e 100644
--- a/public/pages/shopping.js
+++ b/public/pages/shopping.js
@@ -351,8 +351,14 @@ function updateListCounter(listId, totalDelta, checkedDelta) {
 // --------------------------------------------------------
 
 async function loadLists() {
-  const data   = await api.get('/shopping');
-  state.lists  = data.data ?? [];
+  try {
+    const data   = await api.get('/shopping');
+    state.lists  = data.data ?? [];
+  } catch (err) {
+    console.error('[Shopping] loadLists Fehler:', err);
+    state.lists = [];
+    window.oikos?.showToast('Listen konnten nicht geladen werden.', 'danger');
+  }
 }
 
 async function loadItems(listId) {
@@ -366,9 +372,11 @@ async function switchList(listId, container) {
   renderTabs(container);
   try {
     await loadItems(listId);
-  } catch {
+  } catch (err) {
+    console.error('[Shopping] loadItems Fehler:', err);
     state.items = [];
     state.activeList = state.lists.find((l) => l.id === listId) ?? null;
+    window.oikos?.showToast('Artikel konnten nicht geladen werden.', 'danger');
   }
   renderListContent(container);
   wireListContentEvents(container);
diff --git a/server/index.js b/server/index.js
index ec1b3f9..3e4798b 100644
--- a/server/index.js
+++ b/server/index.js
@@ -67,6 +67,17 @@ app.set('trust proxy', 1);
 app.use(express.json({ limit: '1mb' }));
 app.use(express.urlencoded({ extended: true, limit: '1mb' }));
 
+// JSON-Parse-Fehler abfangen (gibt sonst HTML zurück)
+app.use((err, req, res, next) => {
+  if (err.type === 'entity.parse.failed') {
+    return res.status(400).json({ error: 'Ungültiges JSON im Request-Body.', code: 400 });
+  }
+  if (err.type === 'entity.too.large') {
+    return res.status(413).json({ error: 'Request-Body zu groß (max. 1 MB).', code: 413 });
+  }
+  next(err);
+});
+
 // --------------------------------------------------------
 // Sessions
 // --------------------------------------------------------
diff --git a/server/routes/contacts.js b/server/routes/contacts.js
index ff45016..1f0a27c 100644
--- a/server/routes/contacts.js
+++ b/server/routes/contacts.js
@@ -151,8 +151,13 @@ router.delete('/:id', (req, res) => {
  * Kategorien-Liste für Dropdowns.
  * Response: { data: { categories } }
  */
-router.get('/meta', (req, res) => {
-  res.json({ data: { categories: VALID_CATEGORIES } });
+router.get('/meta', (_req, res) => {
+  try {
+    res.json({ data: { categories: VALID_CATEGORIES } });
+  } catch (err) {
+    console.error('[contacts/GET /meta]', err);
+    res.status(500).json({ error: 'Interner Fehler', code: 500 });
+  }
 });
 
 module.exports = router;
diff --git a/server/routes/dashboard.js b/server/routes/dashboard.js
index 980f8ba..5dabcf3 100644
--- a/server/routes/dashboard.js
+++ b/server/routes/dashboard.js
@@ -25,6 +25,7 @@ const db = require('../db');
  * }
  */
 router.get('/', (req, res) => {
+  try {
   const d = db.get();
   const result = {};
 
@@ -116,6 +117,10 @@ router.get('/', (req, res) => {
   }
 
   res.json(result);
+  } catch (err) {
+    console.error('[Dashboard] Kritischer Fehler:', err.message);
+    res.status(500).json({ error: 'Dashboard konnte nicht geladen werden.', code: 500 });
+  }
 });
 
 module.exports = router;