diff --git a/frontend/app/__init__.py b/frontend/app/__init__.py
new file mode 100644
index 0000000..b78e36b
--- /dev/null
+++ b/frontend/app/__init__.py
@@ -0,0 +1,41 @@
+from __future__ import annotations
+
+import json
+import secrets
+from pathlib import Path
+
+from flask import Flask
+
+from .routes import ui
+
+
+def _load_secret_key(conf_path: Path) -> str:
+    default_key = secrets.token_hex(32)
+
+    if not conf_path.exists():
+        return default_key
+
+    try:
+        payload = json.loads(conf_path.read_text(encoding="utf-8"))
+    except Exception:
+        return default_key
+
+    value = payload.get("secret_key") if isinstance(payload, dict) else None
+    if isinstance(value, str) and value.strip():
+        return value.strip()
+    return default_key
+
+
+def create_app() -> Flask:
+    app = Flask(__name__)
+
+    frontend_root = Path(__file__).resolve().parents[1]
+    project_root = Path(__file__).resolve().parents[2]
+    conf_path = frontend_root / "data" / "conf.json"
+
+    app.config["PROJECT_ROOT"] = project_root
+    app.config["MUSIC_DIR"] = project_root / "backend" / "data" / "musiques"
+    app.secret_key = _load_secret_key(conf_path)
+
+    app.register_blueprint(ui)
+    return app