JSON (JavaScript Object Notation) is a lightweight data-interchange format. It can represent integer, real number, string, an ordered sequence of value, and a collection of name/value pairs. JsonCpp is a simple API to manipulate JSON value, handle serialization and unserialization to string. It can also preserve existing comment in unserialization/serialization steps, making it a convenient format to store user input files. Unserialization parsing is user friendly and provides precise error reports.