  We revisit the electromagnetic form factors of the proton and neutron in the
original-minimal soft-wall holographic QCD, which has only two parameters,
i.e., the mass scale $\kappa$ and the twist parameter of the nucleon $\tau$. We
first fix $\tau=3$ by the hard scattering rule, and extract
$\kappa=0.402~\text{GeV}$ from the world data (including the Mainz A1 data) of
the Sachs magnetic form factor of the proton $G_M^p$. We then predict among
others, the charge radius of the proton to be
$\bf{r_{p}=0.831\,\pm\,0.008\,\,\text{fm}}$, in perfect agreement with the
recent charge radius of the proton measured by the PRad collaboration at
Jefferson Lab, and in agreement with the muonic hydrogen experiments. Our
prediction for the proton elastic form factor ratio $\mu_pG_E^p/G_M^p$ is also
in very good agreement with the recent high precision Jefferson Lab recoil
polarization experiment E08-007 for $Q^2=0.3\,-\,0.6~\text{GeV}^2$, and with
the recent high precision Mainz A1 experiment for $Q^2< 0.13~\text{GeV}^2$.
