diff --git a/_validate/createJson.py b/_validate/createJson.py
index 5dd2b85..1701bc0 100644
--- a/_validate/createJson.py
+++ b/_validate/createJson.py
@@ -72,7 +72,18 @@ def generateJsonFile(
 	filePath = buildOutputFilePath(data, parentDir)
 
 	with open(filePath, "wt", encoding="utf-8") as f:
-		json.dump(dataclasses.asdict(data), f, indent="\t", ensure_ascii=False)
+		json.dump(
+			dataclasses.asdict(
+				data,
+				# The JSON schema does not permit null values, but does contain optional keys.
+				# # We have already ensured that all required keys are present in the metadata,
+				# So we can safely delete all keys whose value is None as optional.
+				dict_factory=lambda args: dict(filter(lambda item: item[1] is not None, args)),
+			),
+			f,
+			indent="\t",
+			ensure_ascii=False,
+		)
 	print(f"Wrote json file: {filePath}")