diff --git a/src/main/Database.php b/src/main/Database.php
index b00915c..944992f 100644
--- a/src/main/Database.php
+++ b/src/main/Database.php
@@ -74,4 +74,41 @@ class Database
         $stmt->bindValue(":password", $password);
         return $stmt->execute() !== false;
     }
+
+    function add_tracking($user_uuid, $person_name): bool
+    {
+        $stmt = $this->db->prepare("INSERT INTO trackings (user_uuid, person_name) VALUES (:user_uuid, :person_name);");
+        $stmt->bindValue(":user_uuid", $user_uuid);
+        $stmt->bindValue(":person_name", $person_name);
+        return $stmt->execute() !== false;
+    }
+
+    function remove_tracking($user_uuid, $person_name): bool
+    {
+        $stmt = $this->db->prepare("DELETE FROM trackings WHERE user_uuid=:user_uuid AND person_name=:person_name;");
+        $stmt->bindValue(":user_uuid", $user_uuid);
+        $stmt->bindValue(":person_name", $person_name);
+        return $stmt->execute() !== false;
+    }
+
+    function has_tracking($user_uuid, $person_name): bool
+    {
+        $stmt = $this->db->prepare("SELECT 1 FROM trackings WHERE user_uuid=:user_uuid AND person_name=:person_name;");
+        $stmt->bindValue(":user_uuid", $user_uuid);
+        $stmt->bindValue(":person_name", $person_name);
+        return $stmt->execute()->fetchArray(SQLITE3_ASSOC) !== false;
+    }
+
+    function list_trackings($user_uuid): array
+    {
+        $stmt = $this->db->prepare("SELECT * FROM trackings WHERE user_uuid=:user_uuid;");
+        $stmt->bindValue(":user_uuid", $user_uuid);
+        $results = $stmt->execute();
+
+        $trackings = [];
+        while ($row = $results->fetchArray(SQLITE3_ASSOC))
+            $trackings[] = $row;
+
+        return $trackings;
+    }
 }
diff --git a/src/main/api.php b/src/main/api.php
index 6d36742..a74880c 100644
--- a/src/main/api.php
+++ b/src/main/api.php
@@ -12,7 +12,7 @@ require_once __DIR__ . "/vendor/autoload.php";
 require_once __DIR__ . "/Database.php";
 
 
-//header("Content-type:application/json;charset=utf-8");
+header("Content-type:application/json;charset=utf-8");
 
 
 // Load config
@@ -39,30 +39,31 @@ if (isset($_POST["action"])) {
     switch ($_POST["action"]) {
         case "register":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
             if (isset($_SESSION["uuid"])) {
-                exit("already logged in");
+                exit("\"already logged in\"");
             }
 
             if (!isset($_POST["email"], $_POST["password"], $_POST["password_confirm"])) {
-                exit("missing inputs");
+                exit("\"missing inputs\"");
             }
 
             if (!filter_var($_POST["email"], FILTER_VALIDATE_EMAIL)) {
-                exit("invalid email");
+                exit("\"invalid email\"");
             }
 
             if ($_POST["password"] !== $_POST["password_confirm"]) {
-                exit("differing passwords");
+                exit("\"differing passwords\"");
             }
 
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READONLY);
-            if ($db->get_user_by_email($_POST["email"]) !== null) {
-                exit("email already in use");
-            }
+            $email_is_in_use = $db->get_user_by_email($_POST["email"]) !== null;
             $db->close();
+            if ($email_is_in_use) {
+                exit("\"email already in use\"");
+            }
 
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
             try {
@@ -75,11 +76,11 @@ if (isset($_POST["action"])) {
             exit("true");
         case "login":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
             if (!isset($_POST["email"], $_POST["password"])) {
-                exit("missing inputs");
+                exit("\"missing inputs\"");
             }
 
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
@@ -87,68 +88,72 @@ if (isset($_POST["action"])) {
             $db->close();
 
             if ($user === null || !password_verify($_POST["password"], $user["password"])) {
-                exit("wrong password");
+                exit("\"wrong password\"");
             }
 
             $_SESSION["uuid"] = $user["uuid"];
             exit("true");
         case "logout":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
             session_destroy();
             exit("true");
         case "user-update-email":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
             if (!isset($_SESSION["uuid"])) {
-                exit("not logged in");
+                exit("\"not logged in\"");
             }
 
             if (!isset($_POST["email"])) {
-                exit("missing inputs");
+                exit("\"missing inputs\"");
             }
 
             if (!filter_var($_POST["email"], FILTER_VALIDATE_EMAIL)) {
-                exit("invalid email");
+                exit("\"invalid email\"");
             }
 
+            // TODO: Check if user exists
+
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READONLY);
             if ($db->get_user_by_email($_POST["email"]) !== null) {
-                exit("email already in use");
+                exit("\"email already in use\"");
             }
             $db->close();
 
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
             $db->set_user_email($_SESSION["uuid"], $_POST["email"]);
             $db->close();
-            exit("true");
+            exit("\"true\"");
         case "user-update-password":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
             if (!isset($_SESSION["uuid"])) {
-                exit("not logged in");
+                exit("\"not logged in\"");
             }
 
             if (!isset($_POST["password_old"], $_POST["password_new"], $_POST["password_confirm"])) {
-                exit("missing inputs");
+                exit("\"missing inputs\"");
             }
 
+            // TODO: Check if user exists
+
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
             $user = $db->get_user_by_uuid($_SESSION["uuid"]);
             $db->close();
 
             if ($user === null || !password_verify($_POST["password_old"], $user["password"])) {
-                exit("wrong password");
+                exit("\"wrong password\"");
             }
 
             if ($_POST["password_new"] !== $_POST["password_confirm"]) {
-                exit("differing passwords");
+                exit("\"differing passwords\"");
             }
 
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
@@ -157,29 +162,69 @@ if (isset($_POST["action"])) {
             exit("true");
         case "user-delete":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
             if (!isset($_SESSION["uuid"])) {
-                exit("not logged in");
+                exit("\"not logged in\"");
             }
 
+            // TODO: Check if user exists
+
             $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
             $db->delete_user($_SESSION["uuid"]);
             $db->close();
 
             session_destroy();
-            break;
+            exit("true");
         case "add-tracking":
-        case "delete-tracking":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
-            break;
+            if (!isset($_SESSION["uuid"])) {
+                exit("\"not logged in\"");
+            }
+
+            if (!isset($_POST["person_name"])) {
+                exit("\"missing inputs\"");
+            }
+
+            $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READONLY);
+            $tracking_already_exists = $db->has_tracking($_SESSION["uuid"], $_POST["person_name"]);
+            $db->close();
+            if ($tracking_already_exists) {
+                exit("\"tracking already exists\"");
+            }
+
+            $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
+            $db->add_tracking($_SESSION["uuid"], $_POST["person_name"]);
+            $db->close();
+
+            exit("true");
+        case "delete-tracking":
+            if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
+                exit("\"no token, or invalid token\"");
+            }
+
+            if (!isset($_SESSION["uuid"])) {
+                exit("\"not logged in\"");
+            }
+
+            if (!isset($_POST["person_name"])) {
+                exit("\"missing inputs\"");
+            }
+
+            // TODO: Check if tracking exists
+
+            $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READWRITE);
+            $db->remove_tracking($_SESSION["uuid"], $_POST["person_name"]);
+            $db->close();
+
+            exit("true");
         case "send-test-email":
             if (!isset($_POST["token"]) || !isset($_SESSION["token"]) || $_POST["token"] !== $_SESSION["token"]) {
-                exit("no token, or invalid token");
+                exit("\"no token, or invalid token\"");
             }
 
             // TODO: Send this to logged-in user
@@ -215,8 +260,17 @@ if (isset($_POST["action"])) {
     }
 } else if (isset($_GET["action"])) {
     // Process GET
-    if ($_GET["action"] == "get-trackings") {
-        // Returns list of people of this user
-        exit("false");
+    if ($_GET["action"] == "list-trackings") {
+        if (!isset($_SESSION["uuid"])) {
+            exit("\"not logged in\"");
+        }
+
+        $db = new Database($config["database"]["filename"], SQLITE3_OPEN_READONLY);
+        $trackings = $db->list_trackings($_SESSION["uuid"], $_SESSION["uuid"]);
+        $db->close();
+
+        exit(json_encode($trackings));
     }
 }
+
+exit("\"unknown action\"");
diff --git a/src/main/index.php b/src/main/index.php
index bff9deb..3937010 100644
--- a/src/main/index.php
+++ b/src/main/index.php
@@ -114,6 +114,32 @@ $_SESSION["token"] = bin2hex(random_bytes(32));
                 </label>
                 <input type="submit" />
             </form>
+
+            <h1>Add tracking</h1>
+            <form action="api.php" method="post">
+                <input type="hidden" name="action" value="add-tracking" />
+                <input type="hidden" name="token" value="<?= $_SESSION["token"] ?>" />
+                <label>
+                    Person name
+                    <input name="person_name" />
+                </label>
+                <input type="submit" />
+            </form>
+
+            <h1>Remove tracking</h1>
+            <form action="api.php" method="post">
+                <input type="hidden" name="action" value="delete-tracking" />
+                <input type="hidden" name="token" value="<?= $_SESSION["token"] ?>" />
+                <label>
+                    Person name
+                    <input name="person_name" />
+                </label>
+                <input type="submit" />
+            </form>
+
+            <h1>Trackings</h1>
+            <pre id="trackings">
+            </pre>
         </section>
     </div>
     <div id="footer"></div>
diff --git a/src/main/js/Main.ts b/src/main/js/Main.ts
index dde0c1e..1988945 100644
--- a/src/main/js/Main.ts
+++ b/src/main/js/Main.ts
@@ -14,4 +14,8 @@ doAfterLoad(() => {
         version: "v%%VERSION_NUMBER%%"
     }));
     $("main").classList.remove("hidden");
+
+    fetch("api.php?action=list-trackings")
+        .then(it => it.text())
+        .then(it => $("#trackings").innerText = it);
 });