function jwtd
    if test (count $argv) = 0
        echo "Usage: jwtd TOKEN" >/dev/stderr

        return 1
    end

    if test -z (command -v jq); or test ! -x (command -v jq)
        echo "jq is not installed" >/dev/stderr

        return 1
    end

    echo "# HEADERS"
    echo "$argv[1]" | jq -R 'split(".") | .[0] | @base64d | fromjson'
    echo ""

    set body (echo "$argv[1]" | jq -R 'split(".") | .[1] | @base64d | fromjson')
    set timestamp (echo $body | jq -r '.exp')
    echo "# BODY"
    echo $body | jq
    echo ""

    if test -n "$timestamp" -a "$timestamp" != null
        if test "$timestamp" -lt (date +"%s")
            echo -n "EXPIRED at: "
        else
            echo -n "Expires:    "
        end

        date --date="@$timestamp"
    else
        echo "NEVER EXPIRES!"
    end

    echo "$argv[1]" | awk -F. '{print "Signature:  " $3}'
end