recursive iterate through json values and sanitize strings with escapeHtml

sanitizeJSONValues.js

function sanitizeJSONValues(obj){
    for (var k in obj){
        if (typeof obj[k] == "object" && obj[k] !== null){
        	sanitizeJSON(obj[k]);        	
        }
        else{
        	if(typeof obj[k]=="string"){
        		obj[k] = escapeHtml(obj[k]);
        	}
        }
    }
}

function escapeHtml(unsafe) {
    return unsafe
         .replace(/&/g, "&")
         .replace(/</g, "&lt;")
         .replace(/>/g, "&gt;")
         .replace(/"/g, "&quot;")
         .replace(/'/g, "&#039;");
 }