diff --git a/json.c b/json.c
index ea55151..335bcd1 100644
--- a/json.c
+++ b/json.c
@@ -15,6 +15,16 @@ int js_isstringobject(js_State *J, int idx)
 	return js_isobject(J, idx) && js_toobject(J, idx)->type == JS_CSTRING;
 }
 
+int js_isbooleanobject(js_State *J, int idx)
+{
+	return js_isobject(J, idx) && js_toobject(J, idx)->type == JS_CBOOLEAN;
+}
+
+int js_isdateobject(js_State *J, int idx)
+{
+	return js_isobject(J, idx) && js_toobject(J, idx)->type == JS_CDATE;
+}
+
 static void jsonnext(js_State *J)
 {
 	J->lookahead = jsY_lexjson(J);
diff --git a/mujs.h b/mujs.h
index a62c7fe..920be29 100644
--- a/mujs.h
+++ b/mujs.h
@@ -198,6 +198,8 @@ int js_isuserdata(js_State *J, int idx, const char *tag);
 int js_iserror(js_State *J, int idx);
 int js_isnumberobject(js_State *J, int idx);
 int js_isstringobject(js_State *J, int idx);
+int js_isbooleanobject(js_State *J, int idx);
+int js_isdateobject(js_State *J, int idx);
 
 int js_toboolean(js_State *J, int idx);
 double js_tonumber(js_State *J, int idx);