In this paper, we completely characterize \(L^{p,q}\)-boundedness of (maximal) Fock projections on \(\mathbb {C}\) for \(1\le p,q\le \infty \). As applications, we identify the dual space of mixed norm space \(F_\alpha ^{p,q}\) of entire functions and present an alternative proof of the Littlewood–Paley formula for \(F_\alpha ^{p,q}\).