0...65160, but which way?

[j2l]

Hello,
AFAIU, you get 65160 values (360x181).
Looking at JSON, it seems that start [0],[0] is located at 90,0 (north Pole) and end at south pole, but is it going on longitudes first, like [181],[0] is south pole, then [182][0] is north pole again?
Or is it starting with latitudes first [360][0] (north pole), then [361][0] is 89°,0°?

How is the grid mapped to values?

[j2l]

Found it!
It was already replied here: cambecc/grib2json#10