diff --git a/gcp_storage_emulator/server.py b/gcp_storage_emulator/server.py
index cfa0ba8..8982dad 100644
--- a/gcp_storage_emulator/server.py
+++ b/gcp_storage_emulator/server.py
@@ -163,7 +163,7 @@ def _decode_raw_data(raw_data, request_handler):
     return raw_data
 
 
-def _read_data(request_handler):
+def _read_data(request_handler, query):
     raw_data = _decode_raw_data(_read_raw_data(request_handler), request_handler)
 
     if not raw_data:
@@ -171,7 +171,7 @@ def _read_data(request_handler):
 
     content_type = request_handler.headers["Content-Type"] or "application/octet-stream"
 
-    if content_type.startswith("application/json"):
+    if content_type.startswith("application/json") and "upload_id" not in query:
         return json.loads(raw_data)
 
     if content_type.startswith("multipart/"):
@@ -251,7 +251,7 @@ def params(self):
     @property
     def data(self):
         if not self._data:
-            self._data = _read_data(self._request_handler)
+            self._data = _read_data(self._request_handler, self._query)
         return self._data
 
     def get_header(self, key, default=None):
diff --git a/gcp_storage_emulator/storage.py b/gcp_storage_emulator/storage.py
index 2800f25..ae11bd9 100644
--- a/gcp_storage_emulator/storage.py
+++ b/gcp_storage_emulator/storage.py
@@ -243,7 +243,7 @@ def add_to_resumable_upload(self, file_id, content, total_size):
         """
         safe_id = self.safe_id(file_id)
         try:
-            file_content = self.get_file(RESUMABLE_DIR, safe_id)
+            file_content = self.get_file(RESUMABLE_DIR, safe_id, False)
         except NotFound:
             file_content = b""
         file_content += content
@@ -292,12 +292,13 @@ def get_resumable_file_obj(self, file_id):
         except KeyError:
             raise NotFound
 
-    def get_file(self, bucket_name, file_name):
+    def get_file(self, bucket_name, file_name, show_error=True):
         """Get the raw data of a file within a bucket
 
         Arguments:
             bucket_name {str} -- Name of the bucket
             file_name {str} -- File name
+            show_error {bool} -- Show error if the file is missing
 
         Raises:
             NotFound: Raised when the object doesn't exist
@@ -310,8 +311,9 @@ def get_file(self, bucket_name, file_name):
             bucket_dir = self._fs.opendir(bucket_name)
             return bucket_dir.open(file_name, mode="rb").read()
         except (FileExpected, ResourceNotFound) as e:
-            logger.error("Resource not found:")
-            logger.error(e)
+            if show_error:
+                logger.error("Resource not found:")
+                logger.error(e)
             raise NotFound
 
     def delete_resumable_file_obj(self, file_id):
diff --git a/tests/test_server.py b/tests/test_server.py
index 572ab1d..d2dc5cb 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -867,6 +867,22 @@ def test_media_upload_without_metadata(self):
             self.assertEqual(blob_content, file.read())
             self.assertEqual(blob.content_type, "text/plain")
 
+    def test_upload_from_file_content_type_json(self):
+        file_name = "test.json"
+        content = b'[{"a": 1}]'
+        bucket = self._client.create_bucket("testbucket")
+        blob = bucket.blob(file_name)
+
+        with NamedTemporaryFile() as temp_file:
+            temp_file.write(content)
+            temp_file.flush()
+            temp_file.seek(0)
+            blob.upload_from_file(temp_file, content_type="application/json")
+
+        blob = bucket.get_blob(file_name)
+        self.assertEqual(blob.name, file_name)
+        self.assertEqual(blob.download_as_bytes(), content)
+
 
 class HttpEndpointsTest(ServerBaseCase):
     """Tests for the HTTP endpoints defined by server.HANDLERS."""