thank you for your answer 🙂 In the last days I learned lots of basics about the work with nodejs and react.
I installed a local WP-Server and getting nodejs run. Because I´m working from a preconfigured PC form my company, I have some problems by installing thinks. Whe I installed nodejs, the setup haven´t set the environment variable. That was the main problem.
Now I have nodejs in version 5.6.0 running. But when I try to install npm in the plugin I get these errors:
jsforwp-example-blocks> npm install npm WARN email@example.com No description npm WARN firstname.lastname@example.org No repository field.
thanks a lot for your help.