How can I write a JSON stream to file using Node.js?

Question

I want to write a full JSON object to a file as it comes in. I'm currently using

const file = fs.createWriteStream('./example.file');
var inputStream = JSON.parse(generatedData);
fs.write(inputStream+"\n");

The stream I'm trying to capture comes from a Leap Motion controller frame.dump . I've attempted to write the object using both JSON.parse() and JSON.stringify() , but it only seems to write undefined lines.

I'm probably not handling the object correctly, but I don't know how to resolve it.

EDIT: For clarification, I know how to write single elements of the JSON object, but I would prefer to dump the entire JSON to each new line.

Answer 1

generatedData is already a JSON string here and you are now parsing it back to an object which is not needed.

As you want to append to the file, I would consider appendFile

fs.open('./example.txt', 'a', (err, fd) => {
  if (err) throw err;
  fs.appendFile(fd, generatedData, 'utf8', (err) => {
    fs.close(fd, (err) => {
      if (err) throw err;
    });
    if (err) throw err;
  });
});