The mol­ecules of ethyl 4-(5-amino-3-methyl-1H-pyrazol-1-yl)­benzoate, C13H15N3O2, are linked by two independent N—H⋯O hydrogen bonds into a chain of edge-fused and alternating R42(8) and R22(20) rings. A combination of N—H⋯N and N—H⋯O hydrogen bonds links the mol­ecules of methyl 4-(5-amino-3-tert-butyl-1H-pyrazol-1-yl)benzoate, C15H19N3O2, into sheets of alternating R22(20) and R66(32) rings. In 4-(5-amino-3-methyl-1H-pyrazol-1-yl)benzoic acid monohydrate, C11H11N3O2·H2O, the mol­ecular components are linked into a three-dimensional framework structure by a combination of five independent hydrogen bonds, two of O—H⋯N type and one each of O—H⋯O, N—H⋯O and N—H⋯N types.