This is definitely the most common cobalt jar there is.  It comes in two varieties, the squatty version shown here and the tall version shown here.  The squatty ones also come in amber.  I'm not so sure on the tall ones.  As you might have guessed from the name "Johnson & Johnson" these jars were originally used to hold medical supplies, namely gauze.  Were they ever used as fruit jars?  I have no idea, but they're certainly accepted within the collecting community as jars.