Sitemap.json doesn't exist. The sitemaps protocol only defines 2 formats: XML and RSS feeds. If you use a "sitemap.json" file it is non-standard and a crawler will simply ignore it or parse it incorrectly.Do sitemap.json has benefits over sitemap.xml? If yes, then what?
Yes, only XML and RSS format...Sitemap.json doesn't exist. The https://sitemaps.orgonly defines 2 formats: XML and RSS feeds. If you use a "sitemap.json" file it is non-standard and a crawler will simply ignore it or parse it incorrectly.
Read more about the formats here:
https://www.sitemaps.org/protocol.html