SignalK server node

[hectorl2k]

I whant to install ServerK-node,

When I go to the appstore of signalK, i cannot find the plugin.

I trie to install by the command :    <  sudo npm install --unsafe-perm -g signalk-server  >

but I have error : 

Code:

sudo npm install --unsafe-perm -g signalk-server

/usr/bin/signalk-generate-token -> /usr/lib/node_modules/signalk-server/bin/signalk-generate-token
/usr/bin/signalk-server -> /usr/lib/node_modules/signalk-server/bin/signalk-server
/usr/bin/signalk-server-setup -> /usr/lib/node_modules/signalk-server/bin/signalk-server-setup
npm WARN react-markdown@4.1.0 requires a peer of react@^15.0.0 || ^16.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN html-to-react@1.3.4 requires a peer of react@^16.0 but none is installed. You must install peer dependencies yourself.

+ signalk-server@1.16.0
updated 1 package in 80.93s

So i try to install :  html-to-react and I have a message who say I must install : react-markdown
So i try to install :  real-markdown and I have a message who say I must install : html-to-react

So I m lock 
what can I do ? 

thanks hector