Security question

When you add /wp-json/wp/v2/users/ to an url to a wp site, you get info that hackers will like very much.
Example:
https://betatest.opajaap.nl/wp-json/wp/v2/users/ gives:

0	
id	1
name	"Opajaap"
url	""
description	""
link	"https://betatest.opajaap.nl/author/opajaap/"
slug	"opajaap"
avatar_urls	
24	"https://secure.gravatar.com/avatar/121f62deb690afd6cb57c19b830d1a1ba4c8ce2f29e916426ded280bb7a71225?s=24&d=mm&r=g"
48	"https://secure.gravatar.com/avatar/121f62deb690afd6cb57c19b830d1a1ba4c8ce2f29e916426ded280bb7a71225?s=48&d=mm&r=g"
96	"https://secure.gravatar.com/avatar/121f62deb690afd6cb57c19b830d1a1ba4c8ce2f29e916426ded280bb7a71225?s=96&d=mm&r=g"
meta	[]
_links	
self	
0	
href	"https://betatest.opajaap.nl/wp-json/wp/v2/users/1"
targetHints	
allow	
0	"GET"
collection	
0	
href	"https://betatest.opajaap.nl/wp-json/wp/v2/users"

How do i prevent this???