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Re:The Internet's Own Boy: The Story of Aaron Swartz (2014) ... by aikah on Sunday October 04, 2020 @01:44PM (#24680792)
Swartz participated in the creation of RSS spec, not JSON AFAIK. He was also involved in the development of reddit.
Re:The Internet's Own Boy: The Story of Aaron Swartz (2014) ... by leejoramo on Sunday October 04, 2020 @05:25PM (#24682364)
Additionally John Gruber acknowledges Aaron’s significant contribution to the creation of Markdown.

https://daringfireball.net/projects/markdown/