diff --git a/synapsepy/client.py b/synapsepy/client.py
index bac1d34..4ab4a35 100644
--- a/synapsepy/client.py
+++ b/synapsepy/client.py
@@ -1,4 +1,5 @@
 
+from .helpers import json_serialize
 from .http_client import HttpClient
 
 from .user import User, Users
@@ -280,7 +281,7 @@ def get_all_users(self, query=None, page=None, per_page=None, show_refresh_token
 		)
 		return Users(response, self.http)
 
-	def get_all_trans(self, page=None, per_page=None):
+	def get_all_trans(self, page=None, per_page=None, filter=None):
 		'''Gets all client transactions
 		Args:
 			page (int): (opt) Page number
@@ -289,10 +290,12 @@ def get_all_trans(self, page=None, per_page=None):
 			(Transactions): object containing pagination info and list of Transaction objects
 		'''
 		self.logger.debug("getting all transactions")
-		
+
+		filter = json_serialize(filter)
+
 		path = paths['trans']
 		response = self.http.get(
-			path, page=page, per_page=per_page
+			path, page=page, per_page=per_page, filter=filter,
 		)
 		return Transactions(response)
 
diff --git a/synapsepy/helpers.py b/synapsepy/helpers.py
new file mode 100644
index 0000000..8b0082a
--- /dev/null
+++ b/synapsepy/helpers.py
@@ -0,0 +1,15 @@
+import json
+
+def json_serialize(obj):
+    if obj is None:
+        pass  # No obj, don’t serialize.
+    elif isinstance(obj, str):
+        try:
+            _ = json.loads(obj)  # All good, a valid JSON string.
+        except json.decoder.JSONDecodeError as e:
+            raise ValueError("obj is not a valid JSON string") from e
+    else:
+        try:
+            obj = json.dumps(obj)  # All good, a JSON serializable object.
+        except TypeError as e:
+            raise ValueError("obj is not JSON serializable") from e
diff --git a/synapsepy/user.py b/synapsepy/user.py
index a478151..0263993 100644
--- a/synapsepy/user.py
+++ b/synapsepy/user.py
@@ -1,4 +1,5 @@
 
+from .helpers import json_serialize
 from .endpoints import paths
 
 from .node import Node, Nodes
@@ -704,7 +705,7 @@ def get_all_nodes(self, page=None, per_page=None, type=None):
 		)
 		return Nodes(response)
 
-	def get_all_node_trans(self, node_id, page=None, per_page=None):
+	def get_all_node_trans(self, node_id, page=None, per_page=None, filter=filter):
 		'''Retrieves all Transactions for a Node
 		Args:
 			node_id (str): ID of the Node
@@ -714,6 +715,9 @@ def get_all_node_trans(self, node_id, page=None, per_page=None):
 			Transactions: Transactions object containing paginated info and Trans records
 		'''
 		self.logger.debug("Retrieving all Transactions for Node")
+
+		filter = json_serialize(filter)
+
 		path = (
 			paths['users']
 			+ '/'
@@ -724,11 +728,11 @@ def get_all_node_trans(self, node_id, page=None, per_page=None):
 			+ paths['trans']
 		)
 		response = self._do_request(
-			self.http.get,path, page=page, per_page=per_page
+			self.http.get,path, page=page, per_page=per_page, filter=filter,
 		)
 		return Transactions(response)
 
-	def get_all_trans(self, page=None, per_page=None):
+	def get_all_trans(self, page=None, per_page=None, filter=filter):
 		'''Retrieves all Transactions for a User
 		Args:
 			page (int): (opt) Page number
@@ -737,9 +741,12 @@ def get_all_trans(self, page=None, per_page=None):
 			Transactions: Transactions object containing paginated info and Trans records
 		'''
 		self.logger.debug("Retrieving all Transactions for User")
+
+		filter = json_serialize(filter)
+
 		path = paths['users'] + '/' + self.id + paths['trans']
 		response = self._do_request(
-			self.http.get, path, page=page, per_page=per_page
+			self.http.get, path, page=page, per_page=per_page, filter=filter
 		)
 		return Transactions(response)