Do it yourself like this:

'use strict';var fs = require('fs');let myObj = {  "rows": [    [      "New , Visitor",      "(not set)",      "(not set)",      "0"    ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile"    ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile"    ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile",    ]  ]}// 1. One way - if you want the results to be in double quotes and you have comas inside// choose another string to temporally replace commas if necessarylet stringToReplaceComas = '!!!!';myObj.rows.map((singleRow) => {  singleRow.map((value, index) => {    singleRow[index] = value.replace(/,/g, stringToReplaceComas);  })})let csv = `"${myObj.rows.join('"\n"').replace(/,/g, '","')}"`;// // or like this// let csv = `"${myObj.rows.join('"\n"').split(',').join('","')}"`;csv = csv.replace(new RegExp(`${stringToReplaceComas}`, 'g'), ',');// // 2. Another way - if you don't need the double quotes in the generated csv and you don't have comas in rows' values// let csv = myObj.rows.join('\n')fs.writeFile('name.csv', csv, 'utf8', function(err) {  if (err) {    console.log('Some error occured - file either not saved or corrupted file saved.');  } else {    console.log('It\'s saved!');  }});

Use libraries

ex. https://github.com/mrodrig/json-2-csv, https://github.com/wdavidw/node-csv, https://github.com/wdavidw/node-csv-stringify

an example using json-2-csv (https://github.com/mrodrig/json-2-csv)

'use strict';const converter = require('json-2-csv');let myObj = {  "rows": [    {      value1: "New Visitor",      value2: "(not set)",      value3: "(not set)",      value4: "0"    },    {      value1: "New Visitor",      value2: "(not set)",      value3: "(not set)",      value4: "mobile"    },    {      value1: "New Visitor",      value2: "(not set)",      value3: "(not set)",      value4: "mobile"    },    {      value1: "New Visitor",      value2: "(not set)",      value3: "(not set)",      value4: "mobile",    }  ]}let json2csvCallback = function (err, csv) {    if (err) throw err;    fs.writeFile('name.csv', csv, 'utf8', function(err) {      if (err) {        console.log('Some error occured - file either not saved or corrupted file saved.');      } else {        console.log('It\'s saved!');      }    });};converter.json2csv(myObj.rows, json2csvCallback, {  prependHeader: false      // removes the generated header of "value1,value2,value3,value4" (in case you don't want it)});

an example using csv-stringify (https://github.com/wdavidw/node-csv-stringify)

'use strict';var stringify = require('csv-stringify');var fs = require('fs');let myObj = {  "rows": [    [      "New Visitor",      "(not set)",      "(not set)",      "0"    ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile"    ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile"    ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile",    ]  ]}stringify(myObj.rows, function(err, output) {  fs.writeFile('name.csv', output, 'utf8', function(err) {    if (err) {      console.log('Some error occured - file either not saved or corrupted file saved.');    } else {      console.log('It\'s saved!');    }  });});

Three easy steps: Read. Convert. Write.

Step 1: Read.

If you need to read the JSON from a file (as indicated by your inclusion of the filename response.json in your post), you will require the Node.js FileSystem API:

const fs = require('fs');                          // Require Node.js FileSystem API.const JSONFile = fs.readFileSync('response.json'); // Read the file synchronously.

Note: If you prefer, you can read the file asynchronously with fs.readFile() and perform the conversion in a callback function.

Step 2: Convert.

Whether you read your JSON from a local file or GET it from a server, you will need to parse it into a Plain Old JavaScript Object first using the JSON.parse method:

const JSONasPOJO = JSON.parse(JSONFile); // Parse JSON into POJO.

Then perform a series of joins on the child arrays and parent array:
SEE EDIT BELOW

/* THIS IS UNNECESSARY FOR "COMMA" SEPARATED VALUESconst CSVString = JSONasPOJO    .rows                    // Get `rows`, which is an array.    .map(                    // Map returns a new array.        row => row.join(',') // Each child array becomes a comma-separated string.       )                        .join('\n');             // Parent array becomes a newline-separated string...                             // ...of comma-separated strings.                             // It is now a single CSV string!*/

EDIT:

While the previous code certainly works, it is unnecessary to use .map and .join on the child arrays. As @Relu demonstrates, a single .join on the parent array is sufficient because JavaScript will automatically convert the child arrays into comma-separated strings by default since .join must return a string and cannot contain any child arrays.

You could use the above pattern if you want to join the child arrays with something other than a comma.

Otherwise:

var CSVString = JSONasPOJO.rows.join('\n'); // Array becomes a newline-separated...                                            // ...string of comma-separated strings.                                            // It is now a single CSV string!

Here, we can see that conversion in action:

const JSONasPOJO = {  "rows": [    [      "New Visitor",      "(not set)",      "(not set)",            "0"    ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile"          ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile"        ],    [      "New Visitor",      "(not set)",      "(not set)",      "mobile" // NOTE: Here I removed a trailing comma,               // ...which is invalid JSON!    ]  ]}const CSVString = JSONasPOJO.rows.join('\n');console.log(CSVString);