I wrote a Python script to convert JSON exports to HTML.
Just for fun but maybe useful to others.
It can generate web pages in different styles, based on a .css.
Pages include Title, Date and Time, Tags, Location, Rating, Text and Photos.
Clicking the Location opens a map.
During export you can select to include or exclude Tags, Location, Rating or Photos.
It can handle multiple JSON files in 1 run, This if you split the export on separate entries.
I include some .css files for multicolumn, vintage style, wrapping, etc.
Of course you need to know how to run a Python script.
The script and css files, some test data can be found at:
[https://github.com/hansvandemeent/Diarium2HTML]
There is also a Readme.md with steps to convert your diary entries.