diff --git a/dap/utils/__init__.py b/dap/utils/__init__.py
index 7447f85..1f23b46 100644
--- a/dap/utils/__init__.py
+++ b/dap/utils/__init__.py
@@ -4,6 +4,7 @@ from .bsreadext import make_bsread_sender, pack_bsread_data
 from .bits import read_bit
 from .bufjson import BufferedJSON
 from .filehandler import FileHandler
+from .jsonext import ExtendedJSONEncoder
 from .randskip import randskip
 from .sorter import Sorter
 from .timestamp import make_bsread_timestamp
diff --git a/dap/utils/jsonext.py b/dap/utils/jsonext.py
new file mode 100644
index 0000000..e6fbb09
--- /dev/null
+++ b/dap/utils/jsonext.py
@@ -0,0 +1,22 @@
+import json
+import numpy as np
+from pathlib import Path
+
+
+class ExtendedJSONEncoder(json.JSONEncoder):
+
+    def default(self, obj):
+        if isinstance(obj, np.ndarray):
+            return obj.tolist()
+        elif isinstance(obj, np.generic): # covers all numpy scalars
+            return obj.item()
+        elif isinstance(obj, complex): # covers builtin complex
+            return {"real": obj.real, "imag": obj.imag}
+        elif isinstance(obj, Path):
+            return str(obj)
+        elif isinstance(obj, set):
+            return sorted(obj)
+        return super().default(obj)
+
+
+