  The effective field theory approach parameterizes the low energy behaviors of
all possible ultraviolet (UV) theories in a systematic way. One of the most
important tasks is thus to find the connection between the effective operators
and their UV origins. The redundancy relations among operators make the
connection very subtle, hence we proposed the j-basis prescription to
illuminate the correspondence between operators and their UV resonances in the
bottom-up way. In this work, we work out the dimension-8 j-basis operators in
the standard model effective field theory (SMEFT), and find all the 146 (82)
tree-level UV resonances along with their couplings up to mass dimension 5 (4).
Furthermore, we point out a few subtleties on operator generation via field
redefinition and on the UV Lagrangian for generic spin resonances. We also
provide a data base storing our results and a \texttt{Mathematica} notebook for
extracting those results for the reader's conveinence.
