I came here to suggest COBOL as a better fit, then saw your comment a few levels up in this thread.
Out of curiosity, does your implementation use CODASYL?
(For people that don't pay much attention to historical software systems, most CODASYL implementations were similar to JSON document databases, so going that way isn't as crazy as it sounds.)
Great comment! Thanks!
No CODASYL, the JSON parser is hand-rolled Fortran with a depth-tracking key scanner
CODASYL not a crazy direction for the feed composer
Got more depth to explore here, still early :)