jsonFilterByKeys.sh

#!/usr/bin/env bash

json2markdowntable () {
	local headers=$@

	echo $headers | sed "s, , | ,g"
	seq $# | while read i; do echo " --- "; done | xargs | sed "s, , | ,g"
	json -a $headers -d" | "
}

# json2markdowntable $@

filterByKeys() {
	local headersjs="$(echo $@ | xargs -n1 | sed -e s,^,+, -e s.$.+,. | xargs | sed -e s,+,"'",g -e s,^,"[", -e s,$,"]",)"

	json -ga -E "
		var headersjs = $headersjs;
		var that = this;

		Object.keys(that).forEach(function(el){
			if (that[el] !== null && typeof that[el] === 'object') {
				Object.keys(that[el]).forEach(function(ell){
					var key = [el, ell].join('.');
					that[key] = that[el][ell];
					delete that[el][ell];
				})
			}
			if (headersjs.indexOf(el) === -1) {
				delete that[el];
			}
		})

	" | json -g
}

filterByKeys $@