How to write each document to a file rather than all documents to a single file

Getting back to your original question, you can write separate documents with the JSON-Formatter, XML-Formatter, and DocumentToBinary snaps. You can then configure the FileWriter snap with an expression for the file name, for example:

'out_' + Date.now() + '.json'

Or, if you just want a sequence number, you can use the ‘snap.in.totalCount’ variable:

'out_' + snap.in.totalCount + '.json'

So, every document generated by the formatter snap will be written to its own file with the name computed by the expression.

To configure the formatters:

• JSON Formatter - Select the ‘Format each document’ option.
• XML Formatter - Clear the ‘Root element’ field. Note that the input document should only have a single field that represents the root element.
• Document To Binary - Set ‘Encode or Decode’ to DOCUMENT.