diff --git a/main.py b/main.py
index 514575a..8e67777 100644
--- a/main.py
+++ b/main.py
@@ -1391,9 +1391,13 @@ async def fastapi_set_option_properties(network: str, req: Request) -> ChangeSet
 async def fastapi_get_node_coord(network: str, node: str) -> dict[str, float] | None:
     return get_node_coord(network, node)
 
-@app.get("/getnetworkcoords/", response_class = PlainTextResponse)
-async def fastapi_get_network_coords(network: str) -> dict[str, dict[str, float]] | None:
-    return json.dumps(get_network_coords(network))
+@app.get("/getnetworkcoords/")
+async def fastapi_get_network_coords(network: str) -> dict[str, str] | None:
+    coords = get_network_coords(network)
+    result = {}
+    for node_id, coord in coords.items():
+        result[node_id] = f"{coord['x']}:{coord['y']}"
+    return result
 
 ############################################################
 # vertex 25.[VERTICES]