REST API Recommendations

Keep JSON minified in all responses

Extra whitespace adds needless response size to requests, and many clients for human consumption will automatically "prettify" JSON output. It is best to keep JSON responses minified e.g.:

{"beta":false,"email":"alice@heroku.com","id":"01234567-89ab-cdef-0123-456789abcdef","last_login":"2012-01-01T12:00:00Z","created_at":"2012-01-01T12:00:00Z","updated_at":"2012-01-01T12:00:00Z"}

Instead of e.g.:

{
  "beta": false,
  "email": "alice@heroku.com",
  "id": "01234567-89ab-cdef-0123-456789abcdef",
  "last_login": "2012-01-01T12:00:00Z",
  "created_at": "2012-01-01T12:00:00Z",
  "updated_at": "2012-01-01T12:00:00Z"
}

You should consider providing a way for clients to retrieve a formatted response, through a query parameter (e.g. ?pretty=true)