npm i

sh run.sh

in the client view (localhost:9000)\

• click on Get OAuth Token
• approve the scopes and authorizations suggested once redirected:
• click on Get Protected Resource

you can check the other views during the whole process: localhost:9001 and localhost:9002

node client.js
OAuth Client is listening at http://127.0.0.1:9000

node authorizationServer.js
OAuth Authorization Server is listening at http://127.0.0.1:9001

node protectedResource.js
OAuth Resource Server is listening at http://127.0.0.1:9002