diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 90c3cd8..dbf006e 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -54,7 +54,7 @@ model timetable {
 
 model users {
   id           Int            @id(map: "pk_users") @default(autoincrement())
-  login        String         @db.VarChar(25)
+  login        String         @unique @db.VarChar(25)
   pass         String?        @db.VarChar(100)
   is_admin     Boolean?       @default(false)
   timetable    timetable[]
diff --git a/src/pages/gate/login.ts b/src/pages/gate/login.ts
index 1d624ea..3749b19 100644
--- a/src/pages/gate/login.ts
+++ b/src/pages/gate/login.ts
@@ -1,34 +1,41 @@
 import type { APIContext } from "astro";
 import { createSession, getUserFromAuth } from "../../db";
+import { Prisma } from "@prisma/client";
 
-export async function post({ request, redirect, cookies }: APIContext) {
+export async function post({ request, cookies }: APIContext) {
     const response: { ok: boolean; reason?: string } = {
         ok: true,
     };
+    try {
+        const formData = await request.formData();
+        const login = formData.get("login");
+        const password = formData.get("password");
+        if (login === null || password === null) {
+            throw new Error("Не предоставлены данные для входа");
+        }
 
-    const formData = await request.formData();
-    const login = formData.get("login");
-    const password = formData.get("password");
-    if (login === null || password === null) {
-        response.ok = false;
-        response.reason = "Не предоставлены данные для входа";
-    } else {
         const user = await getUserFromAuth(login!.toString(), password!.toString());
-
         if (user === null) {
-            response.ok = false;
-            response.reason = "Неправильная связка логин/пароль";
+            throw new Error("Неправильная связка логин/пароль");
+        }
+
+        const session = await createSession(user!);
+        if (session === null) {
+            throw new Error("Не удалось создать сессию для пользователя");
+        }
+
+        response.ok = true;
+        cookies.set("session", session.id, {
+            path: "/",
+        });
+    } catch (e: any) {
+        response.ok = false;
+        if (e instanceof Prisma.PrismaClientKnownRequestError) {
+            response.reason = `Неизвестная ошибка базы данных. Код ${e.code}`;
+        } else if (e instanceof Error) {
+            response.reason = e.message.trim();
         } else {
-            const session = await createSession(user!);
-            if (session !== null) {
-                response.ok = true;
-                cookies.set("session", session.id, {
-                    path: "/",
-                });
-            } else {
-                response.ok = false;
-                response.reason = "Не удалось создать сессию для пользователя";
-            }
+            response.reason = e.toString().trim();
         }
     }
 
diff --git a/src/pages/gate/register.ts b/src/pages/gate/register.ts
index 077373a..c048bf0 100644
--- a/src/pages/gate/register.ts
+++ b/src/pages/gate/register.ts
@@ -1,25 +1,39 @@
 import type { APIContext } from "astro";
 import { createUser } from "../../db";
+import { Prisma } from "@prisma/client";
 
 export async function post({ request }: APIContext) {
     const response: { ok: boolean; reason?: string } = {
         ok: true,
     };
 
-    const formData = await request.formData();
-    const login = formData.get("login");
-    const password = formData.get("password");
-    if (login === null || password === null) {
-        response.ok = false;
-        response.reason = "Не предоставлены данные для регистрации";
-    } else {
+    try {
+        const formData = await request.formData();
+        const login = formData.get("login");
+        const password = formData.get("password");
+        if (login === null || password === null) {
+            throw new Error("Не предоставлены данные для регистрации");
+        }
+
         const user = await createUser(login!.toString(), password!.toString());
 
         if (user === null) {
-            response.ok = false;
-            response.reason = "Невозможно зарегистрировать пользователя";
+            throw new Error("Невозможно зарегистрировать пользователя");
+        }
+
+        response.ok = true;
+    } catch (e: any) {
+        response.ok = false;
+        if (e instanceof Prisma.PrismaClientKnownRequestError) {
+            if (e.code === "P2002") {
+                response.reason = "Пользователь с таким логином уже существует";
+            } else {
+                response.reason = `Неизвестная ошибка базы данных. Код ${e.code}`;
+            }
+        } else if (e instanceof Error) {
+            response.reason = e.message.trim();
         } else {
-            response.ok = true;
+            response.reason = e.toString().trim();
         }
     }
 
diff --git a/src/pages/login.astro b/src/pages/login.astro
index f6fafc5..8a83177 100644
--- a/src/pages/login.astro
+++ b/src/pages/login.astro
@@ -23,7 +23,7 @@ if (Astro.cookies.has("session")) {
                             <h2 class="p-3">Вход</h2>
                         </div>
                         <div class="card-body">
-                            <form method="POST" action="/gate/login">
+                            <form method="POST" onsubmit="doLogin(this); return false;">
                                 <div class="mb-4">
                                     <label for="login" class="form-label">Логин</label>
                                     <input type="text" class="form-control" id="login" id="login" name="login" required />
@@ -45,4 +45,29 @@ if (Astro.cookies.has("session")) {
     </main>
 </Layout>
 
+<script is:inline>
+    async function doLogin(form) {
+        try {
+            const fd = new FormData(form);
+            const resp = await fetch("/gate/login", {
+                method: "POST",
+                body: fd,
+            });
+            const json = await resp.json();
+            if (json.ok) {
+                location.href = "/";
+            } else {
+                throw new Error(json.reason);
+            }
+        } catch (e) {
+            console.error(e);
+            if (e instanceof Error) {
+                alert(e.message);
+            } else {
+                alert("Неизвестная ошибка");
+            }
+        }
+    }
+</script>
+
 <style></style>
diff --git a/src/pages/register.astro b/src/pages/register.astro
index 76b2374..1ff4d6f 100644
--- a/src/pages/register.astro
+++ b/src/pages/register.astro
@@ -23,7 +23,7 @@ if (Astro.cookies.has("session")) {
                             <h2 class="p-3">Регистрация</h2>
                         </div>
                         <div class="card-body">
-                            <form method="POST" action="/gate/register">
+                            <form method="POST" onsubmit="doRegistration(this); return false;">
                                 <div class="mb-4">
                                     <label for="login" class="form-label">Логин</label>
                                     <input type="text" class="form-control" id="login" id="login" name="login" required />
@@ -45,4 +45,29 @@ if (Astro.cookies.has("session")) {
     </main>
 </Layout>
 
+<script is:inline>
+    async function doRegistration(form) {
+        try {
+            const fd = new FormData(form);
+            const resp = await fetch("/gate/register", {
+                method: "POST",
+                body: fd,
+            });
+            const json = await resp.json();
+            if (json.ok) {
+                location.href = "/";
+            } else {
+                throw new Error(json.reason);
+            }
+        } catch (e) {
+            console.error(e);
+            if (e instanceof Error) {
+                alert(e.message);
+            } else {
+                alert("Неизвестная ошибка");
+            }
+        }
+    }
+</script>
+
 <style></style>