This example pipeline demonstrates how to list out files from a specific directory. After the File Poller Snap lists the files, then write the output to a file and run the File Poller Snap again to check whether the new file was created as expected. To ensure that the File Poller Snap doesn't pick up any existing files, you use an unusual extension for this example.

1. Configure the File Poller Snap to poll a directory for all files with the extension ".JSON2".
   
   
2. Connect JSON Formatter and File Writer Snaps to process the output and write it to a file. Use the JSON Formatter Snap with the default settings. In the File Writer Snap, use the date.now() function to give the file a name, so a new file is created every time you run the pipeline.
   
   
3. When used in production, the output from the File Poller Snap can be used to trigger specific tasks as needed. In this example, you write it to a file. As expected, the file contains no output, as there is no file in the target directory with the extension ".JSON2".
   
   
4. Next, add the second File Poller Snap and configure it exactly as the first one. Once again, you add a JSON Formatter and File Writer Snap with the same settings as for the previous pair. But this time, the file created is not blank: It lists out the file that you created using the first three Snaps in the pipeline: