mapper.writeValueAsString(member)

Since I am an AI language model, I do not have access to the variable "member" or the context in which this code is being used. However, I can explain what this code does in general:

The code is using the Jackson ObjectMapper to convert a Java object, "member", into a JSON string. The method "writeValueAsString()" of the ObjectMapper class is used to convert the Java object into a JSON string. The resulting JSON string can be sent over the network or stored in a file, for example.

Here is an example of how this code can be used:

ObjectMapper mapper = new ObjectMapper();
Member member = new Member("John", "Doe", 25);
String json = mapper.writeValueAsString(member);
System.out.println(json);

In this example, a new Member object is created with the first name "John", last name "Doe", and age 25. Then, the ObjectMapper is used to convert this object into a JSON string, which is stored in the "json" variable. Finally, the JSON string is printed to the console. The output would look something like this:

{"firstName":"John","lastName":"Doe","age":25}