Replace quote with double quote when wrap enabled.

src/app.js

@@ -204,6 +204,7 @@ function toCSV(data, opts){
     if(headers){
       if(opts.wrap){
         headers = headers.map(function(item){
+          item = item.replace(/"/g, '""');
           return opts.wrap + item + opts.wrap;
         });
       }
@@ -226,7 +227,9 @@ function toCSV(data, opts){
             if(csvJSON[keys[j]][i]){
                 csvJSON[keys[j]][i] = csvJSON[keys[j]][i].replace(replaceNewLinePattern, '\t');
                 if(opts.wrap){
-                    csvJSON[keys[j]][i] = opts.wrap + csvJSON[keys[j]][i] + opts.wrap;
+                    var str = csvJSON[keys[j]][i];
+                    str = str.replace(/"/g, '""');
+                    csvJSON[keys[j]][i] = opts.wrap + str + opts.wrap;
                 }
                 row[row.length] = csvJSON[keys[j]][i];
             }else{

tests/main.test.js

@@ -114,7 +114,35 @@ describe('toCSV', function() {
       expect(result).to.be.an('string');
       done();
   });
-
+
+  it('should double quote a quote when wrap options set', function(done) {
+    var jsonWithQuote = {
+      "person": [
+        {
+          "firstName": "Jane",
+          "lastName": "Doe",
+          "greeting": "Hello World"
+        },
+        {
+          "firstName": "Agatha",
+          "lastName": "Doe",
+          "greeting": "This is a quote \""
+        }
+      ]
+    };
+    var opts = {
+      wrap: true
+    }
+    var result = csvjson.toCSV(jsonWithQuote, opts);
+    expect(result).to.be.an('string');
+    expect(result).equals(
+			"\".person[].firstName\",\".person[].lastName\",\".person[].greeting\"\n"
+      + "\"Jane\",\"Doe\",\"Hello World\"\n"
+      + "\"Agatha\",\"Doe\",\"This is a quote \"\"\""  // should double quote a quote in CSV string.
+    );
+    done();
+  });
+
 });