Add fastapi code

venv/lib/python3.11/site-packages/itsdangerous/_json.py

@@ -0,0 +1,16 @@
+import json as _json
+import typing as _t
+
+
+class _CompactJSON:
+    """Wrapper around json module that strips whitespace."""
+
+    @staticmethod
+    def loads(payload: _t.Union[str, bytes]) -> _t.Any:
+        return _json.loads(payload)
+
+    @staticmethod
+    def dumps(obj: _t.Any, **kwargs: _t.Any) -> str:
+        kwargs.setdefault("ensure_ascii", False)
+        kwargs.setdefault("separators", (",", ":"))
+        return _json.dumps(obj, **kwargs)