n8n code node that turns the input json data to a JSONL binary file (single line json object with new line at the end)

code.js

const content = $input.item.json.content;
const jsonlString = JSON.stringify(content) + '\n';
const buffer = Buffer.from(jsonlString, 'utf-8');

const binaryData = await this.helpers.prepareBinaryData(
  buffer,
  'data.jsonl',
  'application/jsonl'
);

return {
  binary: {
    data: binaryData,
  }
};