diff --git a/express-server/db-connect/db-connect.js b/express-server/db-connect/db-connect.js
index 24a9d8d3..b94e887d 100644
--- a/express-server/db-connect/db-connect.js
+++ b/express-server/db-connect/db-connect.js
@@ -80,13 +80,11 @@ async function generateUser() {
 }
 
 //get shoppinglist content
-async function displayShoppinglist(sl_id) {
+async function displayShoppinglist(sl_id, username) {
     try {
         let groups = await query('SELECT row_to_json("Group") AS obj FROM "Group" JOIN "Shoppinglist" USING (sl_id) WHERE sl_id = $1;', [sl_id]);
         let items = await query('SELECT row_to_json("Item") AS obj FROM "Item" JOIN "Group" USING (group_id) WHERE "Group".sl_id = $1;', [sl_id]);
         return items_in_groups(groups, items, sl_id);
-        
-        
     }
 
     catch (error) {
@@ -135,6 +133,35 @@ async function addItem(group_id, sl_id, name, count) {
     }
 }
 
+// Invite System
+
+async function verifyInvite(link, user_id) {
+    try {
+        let result = await query('SELECT row_to_json("Shoppinglist") AS obj FROM "Shoppinglist" WHERE invitelink = $1;', [link]);
+        let sl_id = result[0].sl_id;
+        console.log(result[0].sl_id);
+        await nonQuery('INSERT INTO "Shoppinglist_member" (username, sl_id) VALUES ($1, $2);', [user_id, sl_id]);
+    }
+
+    catch (error) {
+        console.error(error);
+    }
+}
+
+async function createInvite(sl_id) {
+    try {
+        let link = generateInviteLink();
+        await nonQuery('UPDATE "Shoppinglist" SET invitelink = $1 WHERE sl_id = $2;', [link, sl_id]);
+    }
+
+    catch (error) {
+        console.error(error);
+    }
+}
+
+
+
+
 
 
 //sl_id generieren
@@ -193,7 +220,19 @@ function items_in_groups(groups, items, sl_id) {
     return result;
 }
 
+//Create invite link for your own shoppinglist
+function generateInviteLink() {
+    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+    var output = "";
+
+    for(let i = 0; i < 50; i++) {
+        output += possible.charAt(Math.floor(Math.random() * possible.length));
+    }
+
+    return output;
+}
+
 module.exports = {
     getShoppinglistsAdmin, getShoppinglistsShared, newShoppinglist, displayShoppinglist, deleteShoppinglist, addGroup,
-    addItem
+    addItem, verifyInvite, createInvite
 }
diff --git a/express-server/routes/index.js b/express-server/routes/index.js
index d81e8841..30af474c 100644
--- a/express-server/routes/index.js
+++ b/express-server/routes/index.js
@@ -109,7 +109,7 @@ router.post("/shoppinglist", async function(req, res, next) {
 
 router.get("/shoppinglist_json/:sl_id", async (req, res) => {
   try {
-    res.status(200).send(await postgres.displayShoppinglist(req.params.sl_id));
+    res.status(200).send(await postgres.displayShoppinglist(req.params.sl_id, req.session.passport.user.profile.id));
   }
 
   catch(err) {
@@ -146,20 +146,45 @@ router.post("/group", async (req, res) => {
 
 router.post("/item", async (req, res) => {
   try {
-   res.status(200).send(postgres.addItem(req.body.group_id, req.body.sl_id, req.body.name, req.body.count));
+   res.status(200).send(await postgres.addItem(req.body.group_id, req.body.sl_id, req.body.name, req.body.count));
   }
 
   catch (err) {
-    res.status(400).send(err);
+    res.status(400).send(await err);
   }
 });
 
 router.get("/test1", (req, res) => {
-  res.render("index1");
+    res.render("index1");
 });
 
 router.get("/userinfo_json", (req, res) => {
   res.send(req.session.passport.user);
 });
 
+// Invite System
+
+router.post("/invite", async (req, res) => {
+  try {
+    res.status(200).send(await postgres.createInvite(req.body.sl_id));
+  }
+
+  catch(err) {
+    res.status(400).send(await err);
+  }
+});
+
+router.get("/invite/:link", async (req, res) => {
+  try {
+    await postgres.verifyInvite(req.params.link, req.session.passport.user.profile.id);
+    res.redirect("/test1");
+  }
+
+  catch(err) {
+    res.redirect("/test1");
+  }
+
+  
+});
+
 module.exports = router;
diff --git a/express-server/views/index1.ejs b/express-server/views/index1.ejs
index 7c72bc34..3225c2c2 100644
--- a/express-server/views/index1.ejs
+++ b/express-server/views/index1.ejs
@@ -17,6 +17,7 @@
       <br>
       <div class="col s6">
         <a href="/logout" class="waves-effect waves-light btn">Logout</a>
+        <a class="waves-effect waves-light red btn btn_invite">Create Invite Link</a>
     </div>
       <br>
     <div class="row">