  We extract the charm quark mass and the strong coupling constant from the
charmonium current correlators calculated with $n_f = 2 + 1$ Mobius domain wall
fermions. We match our lattice calculation for the temporal moments of the
correlator with perturbative result known up to four-loop order, and extract
the charm quark mass with uncertainty less than 1%. Using the temporal moments,
we also confirm the correlators in the vector channel to be consistent with the
experimental data for the R-ratio. We used the ensembles generated by the JLQCD
collaboration at lattice spacings $a$ = 0.080 fm, 0.055 fm and 0.044 fm.
