> Also I see that Helios uses Either for parsin...

# helios

[simon.vergauwen]

Also I see that Helios uses Either for parsing return type, are there plans to use IO/BIO in future?

Either is a more generic type, and the code in Helios is pure, or in other words it does not throw. You could easily lift it into IO or BIO if you want to run the parsers as an effect on a certain context. IO { Json.parse… }