The qcML format was published in 2014 as an XML PSI-like format for encoding mass spectrometry quality control (QC) metrics, but without the PSI ratification process. However, several shortcomings were soon identified and general interest in QC waned, both of which hindered adoption. Renewed interest for a QC format within the PSI has led to a simplified, yet more versatile JSON-based new format, called mzQC, that fixed these shortcomings and includes the participation of members of the community most interested in supporting mzQC in their QC tools. As a result, many QC-relevant concept and metric terms have been proposed for integration into the PSI-MS CV. This JSON-based format is currently under review in the PSI DocProc.