Force.com Canvas NodeJS Base

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Installation info

Setup -> Create -> Apps -> (Connected Apps) New
Fill Conntected App Name, API Name and Contact Email
Check the Enable OAuth Settings in the API (Enable OAuth Settings) section
Callback URL: put a valid URL (you don't need it for the scope of this example)
Selected OAuth Scopes: select the scopes you want for the NodeJS app acess token to grant
In the section Canvas App Settings type:
Canvas App URL: the url of the POST action to be called by Salesforce when injecting the session data (e.g. https://nodejs-canvas-test.herokuapp.com/canvas/callback)
Access Method: use Signed Request (POST)
Locations: choose Chatter Tab (the app will be shown in the Chatter page)

Than you need to enable this app

Setup -> Manage Apps -> Connected Apps -> Your App Name
In the OAuth policies select Admin approved users are pre-authorized for the Permitted Users field
In the Profiles related list select your profile (all user of that profile are automatically allowed to consume this app)

There are more ways to configure the Canvas App usage, this is the quicker.

$ heroku config:set SF_CANVASAPP_CLIENT_SECRET=XXXXXXXXX
Adding config vars and restarting myapp... done, v12
SF_CANVASAPP_CLIENT_SECRET: XXXXXXXXX