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Blazars are a peculiar class of active galactic nuclei (AGNs) that enlightenthe sky at all wavelengths. The electromagnetic emission of these sources isjet-dominated resulting in a spectral energy distribution (SED) that has atypical double-humped shape. X-ray photons provide a wealth of information onthe physics of each source as in the X-ray band we can observe the tail of SEDfirst peak, the rise of the second one or the transition between the two.NuSTAR, thanks to its capability of focusing X-rays up to 79 keV providesbroadband data particularly suitable to compute SEDs in a still poorly exploredpart of the spectrum. In the context of the Open Universe initiative wedeveloped a dedicated pipeline, NuSTAR_Spectra, a shell-script thatautomatically downloads data from the archive, generates scientific productsand carries out a complete spectral analysis. The script homogeneously extractshigh level scientific products for both NuSTAR's telescopes and the spectralcharacterisation is performed testing two phenomenological models. Thecorresponding X-ray properties are derived from the data best-fit and the SEDsare also computed. The systematic processing of all blazar observations of theNuSTAR public archive allowed us to release the first hard X-ray spectroscopiccatalogue of blazars (NuBlazar). The catalogue, updated to September 30th,2021, includes 253 observations of 126 distinct blazars, 30 of which have beenmultiply observed.

The first hard X-ray spectral catalogue of Blazars observed by NuSTAR