diff --git a/fimfarchive/tasks/update.py b/fimfarchive/tasks/update.py
index 8fa1402..b00a928 100644
--- a/fimfarchive/tasks/update.py
+++ b/fimfarchive/tasks/update.py
@@ -117,10 +117,12 @@ class UpdateTask(SignalSender):
         skip_mapper = self.get_mapper('skip')
         epub_mapper = self.get_mapper('epub')
         html_mapper = self.get_mapper('html')
+        json_mapper = self.get_mapper('json')
 
         self.skip_writer = DirectoryWriter(skip_mapper)
         self.epub_writer = DirectoryWriter(meta_mapper, epub_mapper)
         self.html_writer = DirectoryWriter(meta_mapper, html_mapper)
+        self.json_writer = DirectoryWriter(meta_mapper, json_mapper)
 
     def get_mapper(self, subdir: str) -> StoryPathMapper:
         """
@@ -160,6 +162,8 @@ class UpdateTask(SignalSender):
         """
         if DataFormat.HTML in story.flavors:
             self.html_writer.write(story)
+        elif DataFormat.JSON in story.flavors:
+            self.json_writer.write(story)
         elif DataFormat.EPUB in story.flavors:
             self.epub_writer.write(story)
         else:
diff --git a/tests/tasks/test_update.py b/tests/tasks/test_update.py
index 0b3e419..c795557 100644
--- a/tests/tasks/test_update.py
+++ b/tests/tasks/test_update.py
@@ -281,6 +281,16 @@ class TestUpdateTask:
         task.write(story)
         task.html_writer.write.assert_called_once_with(story)
 
+    def test_write_json(self, task, story):
+        """
+        Tests writing of a story in JSON format.
+        """
+        story = story.merge(flavors=[DataFormat.JSON])
+        task.json_writer.write = MagicMock()
+
+        task.write(story)
+        task.json_writer.write.assert_called_once_with(story)
+
     def test_write_unsupported(self, task, story):
         """
         Tests `ValueError` is raised for unknown data formats.