Hi! thanks for the reply but now there is another problem. It works now and it exports to json but it looks like this:

["start",["seq","(",[["seqstr",["tagstr",["OZN","SBARQ "],["_alternati
+on_1_of_production_1_of_rule_tagstr",["seq","(",[["seqstr",["tagstr",
+["OZN","WHADVP "],["_alternation_1_of_production_1_of_rule_tagstr",["
+seq","(",[["seqstr",["tagstr",["OZN","WRB "],["_alternation_1_of_prod
+uction_1_of_rule_tagstr",["rijec","Where"]]]]],")"]]]]],")"]]]],["seq
+str",["seq","(",[["seqstr",["tagstr",["OZN","SQ "],["_alternation_1_o
+f_production_1_of_rule_tagstr",["seq","(",[["seqstr",["tagstr",["OZN"
+,"VBZ "],["_alternation_1_of_production_1_of_rule_tagstr",["rijec","i
+s"]]]]],")"]]]],["seqstr",["seq","(",[["seqstr",["tagstr",["OZN","NP 
+"],["_alternation_1_of_production_1_of_rule_tagstr",["seq","(",[["seq
+str",["tagstr",["OZN","NNP "],["_alternation_1_of_production_1_of_rul
+e_tagstr",["rijec","Inoco"]]]]],")"]]]]],")"]],["seqstr",["seq","(",[
+["seqstr",["tagstr",["OZN","VP "],["_alternation_1_of_production_1_of
+_rule_tagstr",["seq","(",[["seqstr",["tagstr",["OZN","VBN "],["_alter
+nation_1_of_production_1_of_rule_tagstr",["rijec","based"]]]]],")"]]]
+]],")"]]],")"]],["seqstr",["seq","(",[["seqstr",["tagstr",["OZN",". "
+],["_alternation_1_of_production_1_of_rule_tagstr",["rijec","?"]]]]],
+")"]]],")"]]
[download]

It should actually look like this example bellow, I mean with curly brackets (not square) and colons instead of comma:

{"firstName": "John",
"lastName" : "Smith",
"age"          : 25,
"address"   :
{"streetAdr
”
: "21 2nd Street",
"city"         : "New York",
"state"       : "NY",
”
zip"          : "10021"},
"phoneNumber":
[{"type"  : "home",
"number": "212 555
-
1234"},
{"type"  : "fax",
"number
”
: "646 555
-
4567"}]
}
[download]

I tried using <autotree> directive and it won't even export to json (shows message:"encountered object 'start=HASH(0x89d0d08)', but neither allow_blessed nor convert_blessed settings are enabled at gramatika.txt line 31.") Is there another way to get desired shape? Thanks!