it's nothing; no big deal; not as bad as expected
Used to downplay a situation or outcome, often after an initial worry. Conveys that something turned out to be trivial or not worth concern.
心配していたが、何のことはない、簡単なミスだった。
I was worried, but it was nothing—just a simple mistake.
試験は難しいと思ったけど、何のこと
I thought the exam would be hard, but it was no big deal; I managed fine.
Standard kanji-kana mixed spelling.
Variant using 事 instead of こと.
Variant using 無い for ない.
Combined variant; less common.
A fixed expression combining 何の (what kind of) + こと (thing/matter) + は (topic marker) + ない (not exist). Literally 'there is no such thing', it developed into a phrase for dismissing something as trivial.