Hello, may I ask what the reason is?

[sujunbo]

Usage: grib2json [options] FILE
Option only takes one value; cannot use [out.txt, true]: [FILE]
[--compact -c] : enable compact Json formatting
[--data -d] : print GRIB record data
[--filter.category --fc value] : select records with this numeric category
[--filter.discipline --fd value] : select records with this discipline
[--filter.parameter --fp value] : select records with this numeric parameter, or the string "wind" for both u,v components
[--filter.surface --fs value] : select records with this numeric surface type
[--filter.value --fv value] : select records with this numeric surface value
[--help -h] : display this help
[--names -n] : print names of numeric codes
[--output -o value] : write output to the specified file (default is stdout)
[--recipe -r value] : a file containing a batch of filter options: fd, fc, fp, fs, fv, and o
[--verbose -v] : enable logging to stdout