diff --git a/controllers/FavoriteController.js b/controllers/FavoriteController.js
new file mode 100644
index 0000000..3c5dcd6
--- /dev/null
+++ b/controllers/FavoriteController.js
@@ -0,0 +1,51 @@
+const FavoriteService = require("../services/FavoriteService");
+
+class FavoriteController {
+    index(req, res) {
+        const favorites = FavoriteService.getFavorites(req.user.id, req.user.household_id);
+
+        res.locals.title = "Favorieten";
+        res.render("favorites/index", {
+            favorites,
+            user: req.user
+        });
+    }
+
+    toggle(req, res) {
+        const productId = Number.parseInt(req.params.id, 10);
+
+        if (!Number.isInteger(productId)) {
+            req.flash("error", "Product niet gevonden.");
+            return res.redirect("/products");
+        }
+
+        const isFavorite = FavoriteService.toggleFavorite(req.user.id, productId, req.user.household_id);
+        if (!isFavorite && !FavoriteService.getFavoriteIds(req.user.id, req.user.household_id).has(productId)) {
+            req.flash("error", "Product niet gevonden.");
+            return res.redirect("/products");
+        }
+
+        req.flash("success", isFavorite ? "Product toegevoegd aan favorieten." : "Product verwijderd uit favorieten.");
+        res.redirect("/products");
+    }
+
+    remove(req, res) {
+        const productId = Number.parseInt(req.params.productId, 10);
+
+        if (!Number.isInteger(productId)) {
+            req.flash("error", "Product niet gevonden.");
+            return res.redirect("/favorites");
+        }
+
+        const removed = FavoriteService.removeFavorite(req.user.id, productId, req.user.household_id);
+        if (!removed) {
+            req.flash("error", "Product niet gevonden in favorieten.");
+            return res.redirect("/favorites");
+        }
+
+        req.flash("success", "Product verwijderd uit favorieten.");
+        res.redirect("/favorites");
+    }
+}
+
+module.exports = new FavoriteController();
diff --git a/controllers/ProductController.js b/controllers/ProductController.js
index cab9126..5bcdd5c 100644
--- a/controllers/ProductController.js
+++ b/controllers/ProductController.js
@@ -2,6 +2,7 @@ const ProductService =
 require("../services/ProductService");
 
 const CategoryService = require("../services/CategoryService");
+const FavoriteService = require("../services/FavoriteService");
 
 const parseCsv = require("../utils/parseCsv");
 
@@ -10,16 +11,18 @@ class ProductController {
 
     index(req, res) {
 
-        const products =
-        ProductService.getProducts(req.user.household_id);
-
+        const products = ProductService.getProducts(req.user.household_id);
+        const favoriteIds = FavoriteService.getFavoriteIds(req.user.id, req.user.household_id);
         const categories = CategoryService.getCategories(req.user.household_id);
 
         res.render(
             "products/index",
             {
                 title:"Producten",
-                products,
+                products: products.map(product => ({
+                    ...product,
+                    is_favorite: favoriteIds.has(product.id)
+                })),
                 categories
             }
 
diff --git a/controllers/ShoppingListController.js b/controllers/ShoppingListController.js
index ee82fa3..3ca6b40 100644
--- a/controllers/ShoppingListController.js
+++ b/controllers/ShoppingListController.js
@@ -1,5 +1,6 @@
 const ProductRepository = require("../repositories/ProductRepository");
 const ShoppingListRepository = require("../repositories/ShoppingListRepository");
+const FavoriteService = require("../services/FavoriteService");
 
 class ShoppingListController {
     index(req, res) {
@@ -63,6 +64,40 @@ class ShoppingListController {
         res.redirect(`/lists/${list.id}`);
     }
 
+    clearItems(req, res) {
+        const list = ShoppingListRepository.findById(req.params.id, req.user.household_id);
+        if (!list) return res.status(404).render("errors/404");
+
+        ShoppingListRepository.clearItems(list.id);
+        this.broadcastUpdate(req, list.id);
+        req.flash("success", "Alle producten zijn verwijderd uit de lijst.");
+        res.redirect(`/lists/${list.id}`);
+    }
+
+    addFavoriteProducts(req, res) {
+        const list = ShoppingListRepository.findById(req.params.id, req.user.household_id);
+        if (!list) return res.status(404).render("errors/404");
+
+        const favorites = FavoriteService.getFavorites(req.user.id, req.user.household_id);
+        const items = favorites.map((favorite) => ({
+            list_id: list.id,
+            product_id: favorite.id,
+            amount: 1,
+            checked: 0,
+            sort_order: 0
+        }));
+
+        if (items.length === 0) {
+            req.flash("info", "Je hebt nog geen favorieten om toe te voegen.");
+            return res.redirect(`/lists/${list.id}`);
+        }
+
+        ShoppingListRepository.addItems(list.id, items);
+        this.broadcastUpdate(req, list.id);
+        req.flash("success", `${items.length} favoriete producten toegevoegd aan de lijst.`);
+        res.redirect(`/lists/${list.id}`);
+    }
+
     deleteItem(req, res) {
         const list = ShoppingListRepository.findById(req.params.id, req.user.household_id);
         if (!list) return res.status(404).json({ error: "Lijst niet gevonden" });
diff --git a/database/migrate.js b/database/migrate.js
index 239ab67..e5c18f0 100644
--- a/database/migrate.js
+++ b/database/migrate.js
@@ -163,18 +163,18 @@ CREATE TABLE IF NOT EXISTS product_favorites (
 
     id INTEGER PRIMARY KEY AUTOINCREMENT,
 
-    user_id INTEGER NOT NULL,
+    household_id INTEGER NOT NULL,
 
     product_id INTEGER NOT NULL,
 
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
 
 
-    UNIQUE(user_id, product_id),
+    UNIQUE(household_id, product_id),
 
 
-    FOREIGN KEY(user_id)
-        REFERENCES users(id)
+    FOREIGN KEY(household_id)
+        REFERENCES households(id)
         ON DELETE CASCADE,
 
 
@@ -217,8 +217,35 @@ const addColumnIfMissing = (table, column, definition) => {
     }
 };
 
+const migrateFavoriteTableToHouseholdScope = () => {
+    const columns = db.prepare(`PRAGMA table_info(product_favorites)`).all();
+    const hasHouseholdId = columns.some(column => column.name === "household_id");
+
+    if (!hasHouseholdId) {
+        db.exec(`ALTER TABLE product_favorites ADD COLUMN household_id INTEGER`);
+        db.exec(`UPDATE product_favorites
+                 SET household_id = (
+                    SELECT products.household_id
+                    FROM products
+                    WHERE products.id = product_favorites.product_id
+                 )
+                 WHERE household_id IS NULL`);
+
+        db.exec(`DELETE FROM product_favorites
+                 WHERE id NOT IN (
+                    SELECT MIN(id)
+                    FROM product_favorites
+                    GROUP BY household_id, product_id
+                 )`);
+
+        db.exec(`CREATE UNIQUE INDEX IF NOT EXISTS idx_product_favorites_household_product
+                 ON product_favorites (household_id, product_id)`);
+    }
+};
+
 addColumnIfMissing("categories", "household_id", "INTEGER REFERENCES households(id)");
 addColumnIfMissing("products", "household_id", "INTEGER REFERENCES households(id)");
+migrateFavoriteTableToHouseholdScope();
 
 const defaultHousehold = db.prepare("SELECT id FROM households ORDER BY id LIMIT 1").get();
 if (defaultHousehold) {
diff --git a/middleware/auth.js b/middleware/auth.js
index 2b957d4..adea771 100644
--- a/middleware/auth.js
+++ b/middleware/auth.js
@@ -1,17 +1,18 @@
 module.exports = function(req, res, next) {
 
-
-    if (!req.session.userId) {
-
+    if (!req.session || !req.session.userId || !req.user) {
         if (req.originalUrl.startsWith("/api/")) {
             return res.status(401).json({ error: "Je bent niet ingelogd" });
         }
 
+        if (req.session && req.session.userId) {
+            delete req.session.userId;
+        }
+
+        req.flash("info", "Je sessie is verlopen. Log opnieuw in.");
         return res.redirect("/login");
-
     }
 
-
     next();
 
 };
diff --git a/middleware/user.js b/middleware/user.js
index a05f64c..9af10b0 100644
--- a/middleware/user.js
+++ b/middleware/user.js
@@ -4,17 +4,21 @@ require("../repositories/UserRepository");
 
 module.exports = function userMiddleware(req, res, next) {
 
+    req.user = null;
 
-    if (req.session.userId) {
-
-        req.user =
-            UserRepository.findById(
-                req.session.userId
-            );
-
+    if (!req.session || !req.session.userId) {
+        return next();
     }
 
+    req.user = UserRepository.findById(req.session.userId);
 
-    next();
+    if (!req.user) {
+        delete req.session.userId;
+        if (typeof req.session.destroy === "function") {
+            return req.session.destroy(() => next());
+        }
+    }
+
+    return next();
 
 };
\ No newline at end of file
diff --git a/repositories/FavoriteRepository.js b/repositories/FavoriteRepository.js
new file mode 100644
index 0000000..103b965
--- /dev/null
+++ b/repositories/FavoriteRepository.js
@@ -0,0 +1,55 @@
+const db = require("../config/database");
+
+class FavoriteRepository {
+    getByHousehold(householdId) {
+        return db.prepare(`
+            SELECT products.id,
+                   products.name,
+                   products.category_id,
+                   products.barcode,
+                   categories.name AS category_name,
+                   categories.icon AS category_icon
+            FROM product_favorites
+            JOIN products ON products.id = product_favorites.product_id
+            LEFT JOIN categories ON categories.id = products.category_id
+            WHERE product_favorites.household_id = ?
+              AND products.household_id = ?
+            ORDER BY products.name ASC
+        `).all(householdId, householdId);
+    }
+
+    getIdsByHousehold(householdId) {
+        return new Set(
+            db.prepare(`
+                SELECT product_favorites.product_id
+                FROM product_favorites
+                JOIN products ON products.id = product_favorites.product_id
+                WHERE product_favorites.household_id = ?
+                  AND products.household_id = ?
+            `).all(householdId, householdId).map(row => row.product_id)
+        );
+    }
+
+    find(householdId, productId) {
+        return db.prepare(`
+            SELECT * FROM product_favorites
+            WHERE household_id = ? AND product_id = ?
+        `).get(householdId, productId);
+    }
+
+    add(householdId, productId) {
+        return db.prepare(`
+            INSERT OR IGNORE INTO product_favorites (household_id, product_id)
+            VALUES (?, ?)
+        `).run(householdId, productId);
+    }
+
+    remove(householdId, productId) {
+        return db.prepare(`
+            DELETE FROM product_favorites
+            WHERE household_id = ? AND product_id = ?
+        `).run(householdId, productId);
+    }
+}
+
+module.exports = new FavoriteRepository();
diff --git a/repositories/ShoppingListRepository.js b/repositories/ShoppingListRepository.js
index 06426ff..c15088f 100644
--- a/repositories/ShoppingListRepository.js
+++ b/repositories/ShoppingListRepository.js
@@ -72,6 +72,37 @@ class ShoppingListRepository {
         `).run(listId);
     }
 
+    clearItems(listId) {
+        return db.prepare(`
+            DELETE FROM shopping_list_items
+            WHERE list_id = ?
+        `).run(listId);
+    }
+
+    addItems(listId, items) {
+        if (!items.length) return 0;
+
+        const insert = db.prepare(`
+            INSERT INTO shopping_list_items (list_id, product_id, amount, checked, sort_order)
+            VALUES (?, ?, ?, ?, ?)
+        `);
+
+        const transaction = db.transaction(() => {
+            for (const item of items) {
+                insert.run(
+                    listId,
+                    item.product_id,
+                    item.amount ?? 1,
+                    item.checked ?? 0,
+                    item.sort_order ?? 0
+                );
+            }
+        });
+
+        transaction();
+        return items.length;
+    }
+
     deleteItem(listId, itemId) {
         return db.prepare(`
             DELETE FROM shopping_list_items WHERE id = ? AND list_id = ?
diff --git a/routes/web.js b/routes/web.js
index dfd0b9a..aec90df 100644
--- a/routes/web.js
+++ b/routes/web.js
@@ -34,6 +34,8 @@ require("../controllers/CategoryController");
 const ShoppingListController =
 require("../controllers/ShoppingListController");
 
+const FavoriteController = require("../controllers/FavoriteController");
+
 const MenuController =
 require("../controllers/MenuController");
 
@@ -119,6 +121,24 @@ router.post(
     ProductController.remove.bind(ProductController)
 );
 
+router.post(
+    "/products/:id/favorite",
+    auth,
+    FavoriteController.toggle.bind(FavoriteController)
+);
+
+router.get(
+    "/favorites",
+    auth,
+    FavoriteController.index.bind(FavoriteController)
+);
+
+router.post(
+    "/favorites/:productId/delete",
+    auth,
+    FavoriteController.remove.bind(FavoriteController)
+);
+
 router.get(
     "/lists",
     auth,
@@ -149,6 +169,18 @@ router.post(
     ShoppingListController.create.bind(ShoppingListController)
 );
 
+router.post(
+    "/lists/:id/favorites/add",
+    auth,
+    ShoppingListController.addFavoriteProducts.bind(ShoppingListController)
+);
+
+router.post(
+    "/lists/:id/items/clear",
+    auth,
+    ShoppingListController.clearItems.bind(ShoppingListController)
+);
+
 router.get(
     "/lists/:id",
     auth,
diff --git a/services/FavoriteService.js b/services/FavoriteService.js
new file mode 100644
index 0000000..4c5ce8e
--- /dev/null
+++ b/services/FavoriteService.js
@@ -0,0 +1,35 @@
+const FavoriteRepository = require("../repositories/FavoriteRepository");
+const ProductRepository = require("../repositories/ProductRepository");
+
+class FavoriteService {
+    getFavorites(userId, householdId) {
+        return FavoriteRepository.getByHousehold(householdId);
+    }
+
+    getFavoriteIds(userId, householdId) {
+        return FavoriteRepository.getIdsByHousehold(householdId);
+    }
+
+    toggleFavorite(userId, productId, householdId) {
+        const product = ProductRepository.findById(productId, householdId);
+        if (!product) return false;
+
+        const current = FavoriteRepository.find(householdId, productId);
+        if (current) {
+            FavoriteRepository.remove(householdId, productId);
+            return false;
+        }
+
+        FavoriteRepository.add(householdId, productId);
+        return true;
+    }
+
+    removeFavorite(userId, productId, householdId) {
+        const product = ProductRepository.findById(productId, householdId);
+        if (!product) return false;
+
+        return FavoriteRepository.remove(householdId, productId).changes > 0;
+    }
+}
+
+module.exports = new FavoriteService();
diff --git a/tmp-favorite-route.sqlite b/tmp-favorite-route.sqlite
new file mode 100644
index 0000000..67e1efc
Binary files /dev/null and b/tmp-favorite-route.sqlite differ
diff --git a/tmp-favorites-check.sqlite b/tmp-favorites-check.sqlite
new file mode 100644
index 0000000..5ee3f00
Binary files /dev/null and b/tmp-favorites-check.sqlite differ
diff --git a/tmp-household-favorites.sqlite b/tmp-household-favorites.sqlite
new file mode 100644
index 0000000..8f4a47a
Binary files /dev/null and b/tmp-household-favorites.sqlite differ
diff --git a/views/favorites/index.ejs b/views/favorites/index.ejs
new file mode 100644
index 0000000..e81ee47
--- /dev/null
+++ b/views/favorites/index.ejs
@@ -0,0 +1,26 @@
+<div class="page-header mb-4">
+    <h1>💙 Favorieten</h1>
+</div>
+
+<div class="card">
+    <div class="card-body">
+        <% if (favorites.length === 0) { %>
+            <p class="text-secondary">Je hebt nog geen favoriete producten.</p>
+        <% } else { %>
+            <div class="list-group">
+                <% favorites.forEach(product => { %>
+                    <div class="list-group-item d-flex justify-content-between align-items-center gap-3">
+                        <div>
+                            <strong><%= product.category_icon || "" %> <%= product.name %></strong>
+                            <div class="text-secondary"><%= product.category_name || "Geen categorie" %></div>
+                        </div>
+
+                        <form method="post" action="/favorites/<%= product.id %>/delete">
+                            <button class="btn btn-sm btn-outline-danger" type="submit">Verwijder</button>
+                        </form>
+                    </div>
+                <% }); %>
+            </div>
+        <% } %>
+    </div>
+</div>
diff --git a/views/lists/show.ejs b/views/lists/show.ejs
index cbfba20..2fa2169 100644
--- a/views/lists/show.ejs
+++ b/views/lists/show.ejs
@@ -2,10 +2,20 @@
     <a href="/lists" class="btn btn-outline-secondary mb-3">&larr; Terug naar lijsten</a>
     <div class="d-flex flex-wrap align-items-center justify-content-between gap-3">
         <h1 class="mb-0"><%= list.name %></h1>
-        <form method="post" action="/lists/<%= list.id %>/items/reset"
-              onsubmit="return confirm('Alle producten weer openzetten?');">
-            <button class="btn btn-outline-primary" type="submit">Alles weer openzetten</button>
-        </form>
+        <div class="d-flex flex-wrap gap-2">
+            <form method="post" action="/lists/<%= list.id %>/favorites/add"
+                  onsubmit="return confirm('Alle favorieten toevoegen aan deze lijst?');">
+                <button class="btn btn-outline-primary" type="submit">Alle favorieten toevoegen</button>
+            </form>
+            <form method="post" action="/lists/<%= list.id %>/items/reset"
+                  onsubmit="return confirm('Alle producten weer openzetten?');">
+                <button class="btn btn-outline-primary" type="submit">Alles weer openzetten</button>
+            </form>
+            <form method="post" action="/lists/<%= list.id %>/items/clear"
+                  onsubmit="return confirm('Weet je zeker dat je alle producten uit deze lijst wilt verwijderen?');">
+                <button class="btn btn-outline-danger" type="submit">Alles verwijderen</button>
+            </form>
+        </div>
     </div>
 </div>
 
diff --git a/views/partials/navbar.ejs b/views/partials/navbar.ejs
index 2c2b7d9..0430e79 100644
--- a/views/partials/navbar.ejs
+++ b/views/partials/navbar.ejs
@@ -27,6 +27,7 @@
         <a class="nav-link" href="/">Dashboard</a>
         <a class="nav-link" href="/lists">Lijsten</a>
         <a class="nav-link" href="/products">Producten</a>
+        <a class="nav-link" href="/favorites">Favorieten</a>
         <a class="nav-link" href="/categories">Categorieën</a>
         <a class="nav-link" href="/household">Huishouden</a>
         <a class="nav-link text-danger" href="/logout">Uitloggen</a>
diff --git a/views/partials/sidebar.ejs b/views/partials/sidebar.ejs
index 591e6a7..4ac69fc 100644
--- a/views/partials/sidebar.ejs
+++ b/views/partials/sidebar.ejs
@@ -26,6 +26,12 @@
 
 </a>
 
+<a class="nav-link" href="/favorites">
+
+💙 Favorieten
+
+</a>
+
 
 <a class="nav-link" href="/household">
 
diff --git a/views/products/edit.ejs b/views/products/edit.ejs
index 1998ccc..918a389 100644
--- a/views/products/edit.ejs
+++ b/views/products/edit.ejs
@@ -32,7 +32,7 @@
                     <button class="btn btn-primary" type="submit" form="product-edit-<%= product.id %>">Wijzigingen opslaan</button>
                     <form method="post" action="/products/<%= product.id %>/delete"
                           onsubmit="return confirm('Weet je zeker dat je dit product wilt verwijderen?');">
-                        <button class="btn btn-outline-danger" type="submit">Product verwijderen</button>
+                        <button class="btn btn-light border text-danger" type="submit">Product verwijderen</button>
                     </form>
                     <a class="btn btn-link" href="/products">Annuleren</a>
                 </div>
diff --git a/views/products/index.ejs b/views/products/index.ejs
index 7edd87a..ddb6a35 100644
--- a/views/products/index.ejs
+++ b/views/products/index.ejs
@@ -23,9 +23,18 @@
                                         <strong><%= product.category_icon || "" %> <%= product.name %></strong>
                                         <div class="text-secondary"><%= product.category_name || "Geen categorie" %></div>
                                     </div>
-                                    <a class="btn btn-sm btn-outline-primary" href="/products/<%= product.id %>/edit">
-                                        Wijzigen
-                                    </a>
+                                    <div class="d-flex align-items-center gap-2">
+                                        <form method="post" action="/products/<%= product.id %>/favorite">
+                                            <button class="btn btn-sm <%= product.is_favorite ? 'btn-danger' : 'btn-outline-secondary' %>"
+                                                    type="submit"
+                                                    aria-label="<%= product.is_favorite ? 'Verwijder uit favorieten' : 'Toevoegen aan favorieten' %>">
+                                                <%= product.is_favorite ? '♥' : '♡' %>
+                                            </button>
+                                        </form>
+                                        <a class="btn btn-sm btn-outline-primary" href="/products/<%= product.id %>/edit">
+                                            Wijzigen
+                                        </a>
+                                    </div>
                                 </div>
                             </div>
                         <% }); %>