We report a demonstration of near-field nanoimaging using nanoscale photodetector (NPD) array. The NPD array has detector pixels with subwavelength dimension and is capable of pixel addressing. An active-media finite-difference time-domain simulation of the NPD array shows an imaging resolution of $150\mathrm{nm}$ for $1.55\mu \mathrm{m}$ light. Additionally, we demonstrate the realization and characterization of the NPD array. The smallest NPD array obtained has 100-nm-wide pixels with $100\mathrm{nm}$ spacing. A responsivity of $0.28\mathrm{A}∕\mathrm{W}$ at $1.31\mu \mathrm{m}$ and $3.3\mathrm{V}$ bias is registered for a $2\times 2$ NPD array pixel. The corresponding photocurrent is $735\mathrm{nA}$ with a dark current of $0.483\mathrm{nA}$ . Using near-field photocurrent microscopy, an imaging resolution of $390\mathrm{nm}$ has been demonstrated.