Hello @spiltan
There are plenty of wf examples around, You can take a look into this one, worked out by myself (so I know better the content):
This one is from a JKI challenge as well. In this case we are parsing JSON obtained from REST services, [ Just KNIME It S01 _ CH12 _ Obtaining a List of Human Genes via REST 
] . You might find it useful as well, that in this link you will find other colleagues solutions’ [ Justknimeit-12 – KNIME Community Hub ] , included KNIME official’s one .
Let us know if we can provide further help with this subject.
BR