The rule checks structured data
LD+JSON for issues that prevent from parsing schema.
It is important to have well-defined structured data
LD+JSON. But when the structure is malformed then it impacts the processing by search engines as they will have difficulties understanding the structure. The rule checks for whitespaces and ensures it gets parsed without issues.
How to fix it
Make sure your structured data
LD+JSON is being represented as a single string, without whitespaces, especially new lines.