  Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we
have recorded 10^5 single pulses from PSR J1022+1001. We studied the
polarization properties, their energy distribution and their times of arrival.
This is only possible with the high sensitivity available using FAST. There is
no indication that PSR~J1022+1001 exhibits giant pulse, nulling or traditional
mode changing phenomena. The energy in the leading and trailing components of
the integrated profile is shown to be correlated. The degree of both linear and
circular polarization increases with the pulse flux density for individual
pulses. Our data indicates that pulse jitter leads to an excess noise in the
timing residuals of 67 ns when scaled to one hour, which is consistent with Liu
et al. (2015). We have unsuccessfully trialled various methods to improve
timing precision through the selection of specific single pulses. Our work
demonstrates that FAST can detect individual pulses from pulsars that are
observed in order to detect and study gravitational waves. This capability
enables detailed studies, and parameterisation, of the noise processes that
affect the sensitivity of a pulsar timing array.
