diff --git a/tools/write_buffer.go b/tools/write_buffer.go
index e67d219..8ae9386 100644
--- a/tools/write_buffer.go
+++ b/tools/write_buffer.go
@@ -14,6 +14,18 @@ func WriteValue(buff *bytes.Buffer, val any) (n int, err error) {
 		err = fmt.Errorf("Unsupported type %T", v)
 	case nil:
 		return
+	case []any:
+		var o []byte
+		o, err = json.Marshal(v)
+		if err == nil {
+			return buff.Write(o)
+		}
+	case map[string]any:
+		var o []byte
+		o, err = json.Marshal(v)
+		if err == nil {
+			return buff.Write(o)
+		}
 	case string:
 		return buff.WriteString(v)
 	case int:
diff --git a/tools/write_buffer_test.go b/tools/write_buffer_test.go
index 1a4a103..aa7e203 100644
--- a/tools/write_buffer_test.go
+++ b/tools/write_buffer_test.go
@@ -30,6 +30,8 @@ func TestWriteBuffer(t *testing.T) {
 		{"json.Number", json.Number("42.13"), "42.13", nil},
 		{"json.RawMessage", json.RawMessage("{}"), "{}", nil},
 		{"time", when, when.Format(time.RFC3339), nil},
+		{"slice", []any{1, 2, "foo"}, `[1,2,"foo"]`, nil},
+		{"map", map[string]any{"baz": 42, "foo": "bar"}, `{"baz":42,"foo":"bar"}`, nil},
 		{"struct", struct{}{}, "", errors.New("Unsupported type struct {}")},
 	}