Did the Weimar republic in Germany have courts who could overturn all those dictatorial laws

The reichstag fire decrees, the enabling act and the merging of president and chancellor are the laws that helped turn Germany into a dictatorship.

But did the Weimar republic have any kind of independent judiciary that could overturn laws if they were unconstitutional? That happens all the time in the US. The executive or legislative passes a law or engages in an action, and then the court puts a stop to it.

Did anything like that exist in the Weimar republic?

The Staatsgerichtshof and only that court was competent for ruling on the constitutionality of laws; it founf in 1932 that the ousting of the center-left Prussian state government by the right-wing Reich government had been unconstitutional but balked at ordering it reversed.

German courts at the time were mostly right of center in their sympathies, and the doctrine of legal positivism (basically, that statute law cannot be invalid) dominated.

Right after Hitler‘s being appointed Chancellor on 30 January 1933 the remaining possibly non-compliant jurists were purged or sufficiently intimidated. No court wanted or dared to gainsay the decrees and laws that implemented dictatorship in 1933/34.

The lesson learned was that Germany needed a Constitutional Court with teeth. That was implemented in the current constitution, the 1949 Grundgesetz, and the Constitutional Court has been a thorn in the side of executives and legislative majorities ever since.

During the hyperinflation of the early 1920s, the Reichsgericht (the supreme court of the civil and criminal court system) developed the so-called Aufwertungsrechtsprechung (a term that can roughly be translated as “appreciation case law”) according to which, in some cases, they would convert pecuniary obligations denominated in pre-inflation marks into inflated marks so that the real value of the debt would remain constant. Subsequently, the German parliament adopted an act which attempted to prohibit this practice and keep the debts fixed at nominal value, but the Reichsgericht took it upon itself to assess the constitutionality of the statute.