JWT with jq

jwt_function.sh

# extract jwt token info
function jwtd () {
    if [[ -x $(command -v jq) ]]; then
         jq -R 'split(".") | .[0],.[1] | @base64d | fromjson' <<< "${1}"
         echo "{\"Signature\": \"$(echo "${1}" | awk -F'.' '{print $3}')\"}"
    fi
}

# Show the experiation date
# NOTE: on a mac, it needs coreutils for the date (use with `gdate`)
# -> brew install coreutils
function jwtexp () {
	res=$(jwtd "${1}" | jq '.exp | select( . != null )' | xargs -I {} gdate -d "@{}")
	echo "expire at: ${res}"
}