The mol-ecule of the title compound, C(6)H(5)ClN(2)O(2), is close to being planar (rms deviation = 0.032 Å for all non-H atoms), with a maximum deviation of -0.107 (3) Å for an O atom. In the crystal structure, inter-molecular N-H⋯O and N-H⋯N inter-actions link the mol-ecules into a three-dimensional network.