diff --git a/fastapi/openapi/docs.py b/fastapi/openapi/docs.py
index 69473d19c..0880defdd 100644
--- a/fastapi/openapi/docs.py
+++ b/fastapi/openapi/docs.py
@@ -114,45 +114,49 @@ def get_swagger_ui_html(
if swagger_ui_parameters:
current_swagger_ui_parameters.update(swagger_ui_parameters)
+ html_swagger_ui_parameters = "\n ".join(
+ [
+ f"{json.dumps(key)}: {json.dumps(jsonable_encoder(value))},"
+ for key, value in current_swagger_ui_parameters.items()
+ ]
+ )
+ html_oauth2_redirect_url = (
+ f"oauth2RedirectUrl: window.location.origin + '{oauth2_redirect_url}',"
+ if oauth2_redirect_url
+ else ""
+ )
+ init_oauth_html = (
+ f"ui.initOAuth({json.dumps(jsonable_encoder(init_oauth))})"
+ if init_oauth
+ else ""
+ )
+
html = f"""
-
-
-
- {title}
-
-
-
-
-
-
-
-
+
+
+
+ {title}
+
+
+
+
+
+
+
+
"""
return HTMLResponse(html)