GitHub's API documentation is fantastic. This page simply records some example responses.
I'm not the biggest fan of the huge and redundant responses their API produces (gzipping reduces the size by nearly 5x!), but at least all the information is there.
JSON responses are pretty-printed by default, which is kind of unusual for a JSON API, but actually kind of nice.
GET /repos/:owner/:repohttps://api.github.com/repos/chbrown/flickr-with-uploads:
{
  "id": 5358636,
  "name": "flickr-with-uploads",
  "full_name": "chbrown/flickr-with-uploads",
  "owner": {
    "login": "chbrown",
    "id": 360279,
    "avatar_url": "https://avatars.githubusercontent.com/u/360279?v=3",
    "gravatar_id": "",
    "url": "https://api.github.com/users/chbrown",
    "html_url": "https://github.com/chbrown",
    "followers_url": "https://api.github.com/users/chbrown/followers",
    "following_url": "https://api.github.com/users/chbrown/following{/other_user}",
    "gists_url": "https://api.github.com/users/chbrown/gists{/gist_id}",
    "starred_url": "https://api.github.com/users/chbrown/starred{/owner}{/repo}",
    "subscriptions_url": "https://api.github.com/users/chbrown/subscriptions",
    "organizations_url": "https://api.github.com/users/chbrown/orgs",
    "repos_url": "https://api.github.com/users/chbrown/repos",
    "events_url": "https://api.github.com/users/chbrown/events{/privacy}",
    "received_events_url": "https://api.github.com/users/chbrown/received_events",
    "type": "User",
    "site_admin": false
  },
  "private": false,
  "html_url": "https://github.com/chbrown/flickr-with-uploads",
  "description": "Flickr API for Node.js using OAuth 1.0a, including upload support and featuring a CLI",
  "fork": false,
  "url": "https://api.github.com/repos/chbrown/flickr-with-uploads",
  "forks_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/forks",
  "keys_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/keys{/key_id}",
  "collaborators_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/collaborators{/collaborator}",
  "teams_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/teams",
  "hooks_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/hooks",
  "issue_events_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/issues/events{/number}",
  "events_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/events",
  "assignees_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/assignees{/user}",
  "branches_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/branches{/branch}",
  "tags_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/tags",
  "blobs_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/git/blobs{/sha}",
  "git_tags_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/git/tags{/sha}",
  "git_refs_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/git/refs{/sha}",
  "trees_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/git/trees{/sha}",
  "statuses_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/statuses/{sha}",
  "languages_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/languages",
  "stargazers_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/stargazers",
  "contributors_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/contributors",
  "subscribers_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/subscribers",
  "subscription_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/subscription",
  "commits_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/commits{/sha}",
  "git_commits_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/git/commits{/sha}",
  "comments_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/comments{/number}",
  "issue_comment_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/issues/comments/{number}",
  "contents_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/contents/{+path}",
  "compare_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/compare/{base}...{head}",
  "merges_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/merges",
  "archive_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/{archive_format}{/ref}",
  "downloads_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/downloads",
  "issues_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/issues{/number}",
  "pulls_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/pulls{/number}",
  "milestones_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/milestones{/number}",
  "notifications_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/notifications{?since,all,participating}",
  "labels_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/labels{/name}",
  "releases_url": "https://api.github.com/repos/chbrown/flickr-with-uploads/releases{/id}",
  "created_at": "2012-08-09T17:15:44Z",
  "updated_at": "2014-10-01T13:38:49Z",
  "pushed_at": "2014-09-30T14:07:09Z",
  "git_url": "git://github.com/chbrown/flickr-with-uploads.git",
  "ssh_url": "[email protected]:chbrown/flickr-with-uploads.git",
  "clone_url": "https://github.com/chbrown/flickr-with-uploads.git",
  "svn_url": "https://github.com/chbrown/flickr-with-uploads",
  "homepage": "",
  "size": 363,
  "stargazers_count": 38,
  "watchers_count": 38,
  "language": "JavaScript",
  "has_issues": true,
  "has_downloads": true,
  "has_wiki": true,
  "has_pages": false,
  "forks_count": 12,
  "mirror_url": null,
  "open_issues_count": 1,
  "forks": 12,
  "open_issues": 1,
  "watchers": 38,
  "default_branch": "master",
  "network_count": 12,
  "subscribers_count": 6
}
The following are the distinct counts (many of these fields are redundant):