diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 7637084..a524987 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -13,6 +13,7 @@
         "@fontsource/roboto": "^5.0.13",
         "@mui/icons-material": "^5.15.20",
         "@mui/material": "^5.15.20",
+        "axios": "^1.7.2",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-router-dom": "^6.23.1"
@@ -2010,6 +2011,21 @@
         "node": ">=8"
       }
     },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q=="
+    },
+    "node_modules/axios": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.7.2.tgz",
+      "integrity": "sha512-2A8QhOMrbomlDuiLeK9XibIBzuHeRcqqNOHp0Cyp5EoJ1IFDh+XZH3A6BkXtv0K4gFGCI0Y4BM7B1wOEi0Rmgw==",
+      "dependencies": {
+        "follow-redirects": "^1.15.6",
+        "form-data": "^4.0.0",
+        "proxy-from-env": "^1.1.0"
+      }
+    },
     "node_modules/babel-plugin-macros": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/babel-plugin-macros/-/babel-plugin-macros-3.1.0.tgz",
@@ -2145,6 +2161,17 @@
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
       "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw=="
     },
+    "node_modules/combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "dependencies": {
+        "delayed-stream": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -2213,6 +2240,14 @@
       "integrity": "sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==",
       "dev": true
     },
+    "node_modules/delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/dir-glob": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",
@@ -2717,6 +2752,38 @@
       "integrity": "sha512-X8cqMLLie7KsNUDSdzeN8FYK9rEt4Dt67OsG/DNGnYTSDBG4uFAJFBnUeiV+zCVAvwFy56IjM9sH51jVaEhNxw==",
       "dev": true
     },
+    "node_modules/follow-redirects": {
+      "version": "1.15.6",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.6.tgz",
+      "integrity": "sha512-wWN62YITEaOpSK584EZXJafH1AGpO8RVgElfkuXbTOrPX4fIfOyEpW/CsiNd8JdYrAoOvafRTOEnvsO++qCqFA==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
+      ],
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependenciesMeta": {
+        "debug": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/form-data": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.0.tgz",
+      "integrity": "sha512-ETEklSGi5t0QMZuiXoA/Q6vcnxcLQP5vdugSpuAyi6SVGi2clPPp+xgEhuMaHC+zGgn31Kd235W35f7Hykkaww==",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "mime-types": "^2.1.12"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -3139,6 +3206,25 @@
         "node": ">=8.6"
       }
     },
+    "node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/minimatch": {
       "version": "9.0.4",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.4.tgz",
@@ -3405,6 +3491,11 @@
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
       "integrity": "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ=="
     },
+    "node_modules/proxy-from-env": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz",
+      "integrity": "sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg=="
+    },
     "node_modules/punycode": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index df54f49..fb96f3e 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -15,6 +15,7 @@
     "@fontsource/roboto": "^5.0.13",
     "@mui/icons-material": "^5.15.20",
     "@mui/material": "^5.15.20",
+    "axios": "^1.7.2",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-router-dom": "^6.23.1"
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 6fa27b0..19f99e1 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -3,13 +3,35 @@ import CssBaseline from "@mui/material/CssBaseline";
 import LoginPage from "./components/LoginPage.tsx";
 import { Route, Routes } from "react-router-dom";
 import MainPage from "./components/MainPage.tsx";
+import { useEffect, useState } from "react";
+import axios from "axios";
+import ProtectedRoute from "./components/ProtectedRoute.tsx";
 
 export default function App() {
+  const [user, setUser] = useState<string | null | undefined>(undefined);
+
+  const loadUser = () => {
+    axios
+      .get("/api/auth/me")
+      .then((response) => {
+        setUser(response.data);
+      })
+      .catch(() => {
+        setUser(null);
+      });
+  };
+
+  useEffect(() => {
+    loadUser();
+  }, []);
+
   return (
     <React.Fragment>
       <CssBaseline />
       <Routes>
-        <Route path="/" element={<MainPage />} />
+        <Route element={<ProtectedRoute user={user} />}>
+          <Route path="/" element={<MainPage />} />
+        </Route>
         <Route path="/login" element={<LoginPage />} />
       </Routes>
     </React.Fragment>
diff --git a/frontend/src/components/ProtectedRoute.tsx b/frontend/src/components/ProtectedRoute.tsx
new file mode 100644
index 0000000..9b85a6f
--- /dev/null
+++ b/frontend/src/components/ProtectedRoute.tsx
@@ -0,0 +1,13 @@
+import { Navigate, Outlet } from "react-router-dom";
+
+type ProtectedRouteProps = {
+  user: string | undefined | null;
+};
+
+export default function ProtectedRoute({ user }: ProtectedRouteProps) {
+  if (user === undefined) {
+    return <div>Loading...</div>;
+  }
+
+  return user ? <Outlet /> : <Navigate to="/login" />;
+}