Decode JWT + convert timestamp to date

decode_jwt.sh

# You can add this to your .bashrc or .zshrc

function decode_jwt {
      echo "$1" | jq -R '
        split(".") |
        .[1] |
        gsub("-"; "+") | gsub("_"; "/") | @base64d |
        fromjson |
        (if .iat then .iat = (.iat | todate) else . end) |
        (if .exp then .exp = (.exp | todate) else . end)
        '
}