Good that you think about that before you start 
50 to 60 items now which may grow to several hundreds screams for a data file. Just think of having a big sale with 20% discount on all items… you don’t want to go through hundreds of files to fix that. Or maintaining stock information. Also adding new products can be made very easy using something like Google Spreadsheets or Notion where you have nicer editing components and then you just export something as json or csv.
Long story short: data file.