The title compound, C(15)H(14)N(2)O(3), exists in the E configuration with respect to the central methyl-idene unit. The dihedral angle between the two substituted benzene rings is 22.0 (2)°. Within the mol-ecule there is an intra-molecular N-H⋯O hydrogen bond involving the hydro-zide H atom and the O atom of the meth-oxy substituent on the adjacent phenyl ring. In the crystal structure, mol-ecules are linked through inter-molecular O-H⋯O hydrogen bonds, forming zigzag chains along the b direction.