Server response gzip convert to JSON / ASCII

I receive from a dedicated server the data in gzip format into a string.
String payload = https.getString();

It contains a JSON structure so my question is how to decode this in ASCII format to work with it
Thanks

Hi, see if arduino json help.

As far as I have seen this lib requires ASCII as input to deserialize

Library Manager shows a library named "unzipLIB by Larry Bank". Maybe that will decompress the data for you.

The data might be in Base64 format so you may need to decode that first.