There is Talend (https://www.talend.com/ https://www.talend.com/) but it's not a library. It's a more general ETL. It requires a time to be learned. I have a t

There is Talend (https://www.talend.com/ https://www.talend.com/) but it's not a library. It's a more general ETL. It requires a time to be learned. I have a tool of my own which "flatten" an object to an array of pairs (for example {"a":1,"b":{"c":2}} becomes ["a":1,"b.c":2]). Something like that may exists in Underscore.js.