allowComments 
  Allows parser to accept C/Java-style comments in JSON input.
Comments are being skipped and are not stored anywhere; this setting does not affect encoding in any way.
More specifically, a comment is a substring that is not a part of JSON key or value, conforming to one of those:
- Starts with - //characters and ends with a newline character- \n.
- Starts with - /*characters and ends with- */characters. Nesting block comments is not supported: no matter how many- /*characters you have, first- */will end the comment.
false by default.