  We calculate the electromagnetic (charge, magnetic and quadrupole) form
factors and the associated static moments of heavy quarkonia (charmonia and
bottomonia) using the Basis Light Front Quantization (BLFQ) approach. For this
work, we adopt light front wavefunctions (LFWFs) generated by a holographic QCD
confining potential and a one-gluon exchange interaction with fixed coupling.
We compare our BLFQ results with the limiting case of a single BLFQ basis state
description of heavy quarkonia and with other available results. These
comparisons provide insights into relativistic effects. Using the same LFWFs
generated in the BLFQ approach, we also present the generalized parton
distributions (GPDs) for selected mesons including those for radially excited
mesons such as $\psi^\prime$ and $\Upsilon^\prime$. Our GPD results establish
the foundation within BLFQ for further investigating hadronic structure such as
probing the spin structure of spin-one hadrons in the off-forward limit.
