  The Alexander method is a combinatorial tool used to determine when two
elements of the mapping class group are equal. We extend the Alexander method
to include the case of infinite-type surfaces. Versions of the Alexander method
was proven by Hern\'andez--Morales--Valdez and Hern\'andez--Hidber. As sample
applications, we verify a relation in the mapping class group, show that the
centers of many twist subgroups of the mapping class group are trivial, and
provide a relatively smaller basis for the topology of the mapping class group.
