Expressions (phrases, clauses, etc.), Noun, Adverb (fukushi)
just to make sure; just to be sure; for confirmation
念のためにもう一度申しますが、締め切りは3月31日です。Let me remind you again that March 31st is the due date. just in case; for caution's sake; by way of precaution
Also written 念の為【ねんのため】