Get/Set JSON key value

json.sh

#!/bin/sh

set_json_val() {
    sed -e 's!^\(\s*"'"$2"'"\s*:\s*"\?\)[^,"]*!\1'"$3"'!' -i $1
}

get_json_val() {
	sed -e 's!\([^\\]\)"!\1!g' -e 's!,$!!' $1 | \
	sed -n "s!.*${2}: *\(.*\)!\1!p"
}

echo $(get_json_val file.json key_name)
set_json_val file.json key_name key_value