Authenticating to BigQuery REST API via OAuth2 from Node.js

Newbie trying to figure out how to get a Node.js application to authenticate and query Google BigQuery, trying to adapt this CodeLab tutorial from Java. What step might i be missing?

First I create this Oauth2 URL using my clientid:

https://accounts.google.com/o/oauth2/auth?
    client_id=1047877053699-den6kbs4v3f2bft6clonsirkj1pc7t6j.apps.googleusercontent.com
    &scope=https://www.googleapis.com/auth/bigquery
    &redirect_uri=http://localhost:3000/oauth2callback
    &access_type=offline
    &response_type=code

This successfully reaches Google, which prompts

A third party service is requesting permission to access your Google Account.

Agreeing that generates a second prompt:

Nodejs_Test is requesting permission to: View and manage your data in Google BigQuery

Agreeing to that, the callback URL is called, with a parameter accessToken.

I think the following url should list tables in my BigQuery project/dataset:

https://www.googleapis.com/bigquery/v2/projects/1047877053699/datasets/visits&accessToken=4%2FC196NizZwlNgWSt5oNqQwendmLNW.0vgUrlGJ6kMRshQV0ieZDApig3NfcgI

But calling with or without the accessToken returns the following message that "Login Required".

 {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "required",
    "message": "Login Required",
    "locationType": "header",
    "location": "Authorization"
   }
  ],
  "code": 401,
  "message": "Login Required"
 }
}

I know you can't repeat the code because of permissions, expired tokens, etc. But I wonder what step I might be missing conceptually.