diff --git a/extra/yaml/dbg/authors.txt b/extra/yaml/dbg/authors.txt
new file mode 100644
index 0000000000..2c5e05bdac
--- /dev/null
+++ b/extra/yaml/dbg/authors.txt
@@ -0,0 +1 @@
+Jon Harper
diff --git a/extra/yaml/dbg/dbg.factor b/extra/yaml/dbg/dbg.factor
new file mode 100644
index 0000000000..ff45c5fb51
--- /dev/null
+++ b/extra/yaml/dbg/dbg.factor
@@ -0,0 +1,43 @@
+! Copyright (C) 2014 Jon Harper.
+! See http://factorcode.org/license.txt for BSD license.
+USING: accessors alien.data classes.struct combinators
+continuations destructors io.encodings.string io.encodings.utf8
+kernel libc locals prettyprint sequences yaml.ffi ;
+IN: yaml.dbg
+
+: event. ( event -- )
+  dup [ data>> ] [ type>> ] bi* {
+    { YAML_STREAM_START_EVENT [ stream_start>>  ] }
+    { YAML_DOCUMENT_START_EVENT [ document_start>> ] }
+    { YAML_DOCUMENT_END_EVENT [ document_end>> ] }
+    { YAML_ALIAS_EVENT [ alias>> ] }
+    { YAML_SCALAR_EVENT [ scalar>> ] }
+    { YAML_SEQUENCE_START_EVENT [ sequence_start>> ] }
+    { YAML_MAPPING_START_EVENT [ mapping_start>> ] }
+    [ nip ]
+  } case . ;
+:: yaml-events ( string -- )
+[
+yaml_parser_t (malloc-struct) &free &yaml_parser_delete :> parser
+parser yaml_parser_initialize .
+
+string utf8 encode [ malloc-byte-array &free ] [ length ] bi :> ( input length )
+parser input length yaml_parser_set_input_string
+
+yaml_event_t (malloc-struct) &free :> event
+
+f :> done!
+[
+  [ done ] [
+    parser event yaml_parser_parse 0 = [
+      "error" throw
+    ] [ [
+        event &yaml_event_delete event.
+        event type>> YAML_STREAM_END_EVENT = done!
+    ] with-destructors ] if
+  ] until
+] [ . ] recover
+
+] with-destructors
+
+;