If you want to search your post by label, you can use this link for “Blogger” label.
/feeds/posts/default/-/Blogger?alt=json
You can use updated-min parameter
https://design-coach-glossary.blogspot.com/feeds/posts/default?alt=json&updated-min=2020-03-14T15:15:00-14:00
JSON Feed API’de maksimum sonuçları belirlemek için max-results parametresini (ex: max-results=250) kullanın.
blogname.blogspot.com/feeds/posts/default?alt=json&max-results=250
JSON Feed API’de arama yapmak için q parametresini (ex: q=word) kullanın.
For posts: blogname.blogspot.com/feeds/posts/default?alt=json&q=word For Pages: blogname.blogspot.com/feeds/pages/default?alt=json&q=word