如何使用API调用打开数据并将数据写入文件节点.js

我编写了一个API,该API的响应是数据数组。每当响应来自那个API时,我都想将该响应存储在那个文件中是.txt格式。我试过了,但它显示了一个错误,如“没有这样的目录或没有这样的路径”。如何使用API创建文件并将数据写入文件节点.js. 这是我写的代码:

    exports.Entry = functions.https.onRequest((req, res) => {
      var fs = require('fs');
      var a = ['6', '7', '8'];
      var b = ['22', '27', '20'];
      var eachrecord = [];

      for (var i = 0; i < a.length; i++) {
        eachrecord += a + b;
      }

      console.log("eachrecord is", eachrecord);

      //Writing each record value into file
     fileWriteSync('./filewriting1.txt');
     function fileWriteSync(filePath){
  var fd = fs.openSync(filePath,'w');
  var length = eachrecord.length;
  for(i = 0;i<length;i++){
    var eachrecordwrite = fs.writeSync(fd,eachrecord[i] + '\n',null,null);

    console.log("hii",eachrecord[i]);

  }
  fs.closeSync(fd);
}
    });