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ESA's mission Euclid, while undertaking its final integration stage, is fullyqualified. Euclid will perform an extragalactic survey ($0<z<2$) by observingin the visible and near-infrared wavelength range. To detect infraredradiation, it is equipped with the Near Infrared Spectrometer and Photometer(NISP) instrument, operating in the 0.9--2 $\mu$m range. In this paper, afterintroducing the survey strategy, we focus our attention on the NISP DataProcessing Unit's Application Software, highlighting the experimental processto obtain the final parametrization of the on-board processing of data producedby the array of 16 Teledyne HAWAII-2RG (HgCdTe) detectors. We report resultsfrom the latest ground test campaigns with the flight configuration hardware -complete optical system (Korsh anastigmat telescope), detectors array (0.56deg$^2$ field of view), and readout systems (16 Digital Control Units andSidecar ASICs). The performance of the on-board processing is then presented.We also describe a major issue found during the final test phase. We show howthe problem was identified and solved thanks to an intensive coordinated effortof an independent review `Tiger' team, lead by ESA, and a team of NISP expertsfrom the Euclid Consortium. An extended PLM level campaign at ambienttemperature in Li\`ege and a dedicated test campaign conducted in Marseille onthe NISP EQM model eventually confirmed the resolution of the problem. Finally,we report examples of the outstanding spectrometric (using a Blue and two RedGrisms) and photometric performance of the NISP instrument, as derived from theend-to-end payload module test campaign at FOCAL 5 -- CSL; these resultsinclude the photometric Point Spread Function (PSF) determination and thespectroscopic dispersion verification.

Euclid's Near-Infrared Spectrometer and Photometer ready for flight -- review of final performance