jq

Count the items in an array:

jq '.|length' foo.json

Get an attribute (e.g. name) for each object in an array:

jq -r .[].name foo.json

(The -r is to get the strings without quotes.)

For each object in an array, print two attributes:

jq -r '.[] | [.itemid, .warehouse] | @tsv' < items.json

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