The injector of the European XFEL started beam operation in December 2015. Besides the gun and the accelerating section, containing a 1.3 and a 3.9 GHz accelerating module, it contains a variety of standard diagnostics systems specially designed for this facility. With very few exceptions, all types of diagnostics systems of the whole XFEL are installed in the injector. Therefore the injector operation allows validating and proving of the diagnostics performances for the entire facility. Most of the standard diagnostics have been available from the very beginning of the beam operation and have been used for the monitoring of the first beam. In the following months the diagnostics have been optimized and used for improvements of beam quality. In this contribution, the first results and the operation experience of the standard beam diagnostics of the European XFEL are reported
