how to read values of JSON response from the server?

how to read values of JSON response from the server?

iam front end developer, and now i should to read JSON responce from
server which looks like that:
<RESULT>
<OVERALL_RESULT></OVERALL_RESULT>
<POINTS>0</POINTS>
<QUESTIONS>
<QUESTION>
<ID>1</ID>
<CORRECT></CORRECT>
</QUESTION>
<QUESTION>
<ID>2</ID>
<CORRECT>X</CORRECT>
</QUESTION>
<QUESTION>
<ID>3</ID>
<CORRECT>X</CORRECT>
</QUESTION>
<QUESTION>
<ID>4</ID>
<CORRECT>X</CORRECT>
</QUESTION>
<QUESTION>
<ID>5</ID>
<CORRECT>X</CORRECT>
</QUESTION>
</QUESTIONS>
</RESULT>
how can i read it and save in variables values from this response? like this:
var q1 = "1";
var q1IsCorrect = false;
var q2 = "2";
var q2IsCorrect = true;
and so on...