如何将javascript变量或console.log（变量）保存到文件中

Question

I am using node and I have some code that I run that puts the data from an API call out in a certain JSON format I need for dynamo. It is about 23000 records or so a day and I am attempting to save them to my hard drive. Can someone please let me know how to save the output of a variable to a file? I have seen other pages on here but most of them seem to cover an html element with onclick or something along those lines. I appreciate any help.

Answer 1

In node to write in a new file or replace old

var fs = require('fs'); // reqire fileSystem node module
fs.writeFile("pathToFile", "Content", function(err) {
  if(err) {
    return console.log(err);
  }
  console.log("The file was saved!");
});

Or append to existing file

fs.appendFile("pathToFile", "Content", function (err) {
  if (err) throw err;
  console.log('Saved!');
});

Answer 2

One of the most common ways to log something from JavaScript is to use AJAX to post the value of the JavaScript variable. You can use any server-side script, including Node's FileSystem API to save a log of the variable to a specific file.

Example:

function saveVariable(variable) {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
     alert("Saved");
    }
  };
  xhttp.open("POST", "save?var=" + variable, true);
  xhttp.send();
}