Rails is parsing a request as html even though it's json

Question

I am trying to create an api with Rails. When I try to issue an ajax request with json in the browser like this:

$.ajax({
  type: "GET",
  url: 'http://localhost:3000',
  dataType: "json",
  contentType: "application/json; charset=utf-8"
});

The rails server is looking at it like html, as can be seen from the logs:

Started GET "/" for ::1 at 2016-08-12 13:52:00 -0400
  ActiveRecord::SchemaMigration Load (0.6ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by LandingsController#index as HTML

It should say as JSON since the request is JSON.

Answer 1

It's depends on how your routing is set, not only what you pass in request. You should set default format in routes.rb like so:

root 'your_root_controller#index', format: 'json'

Should work in Rails 4 & 5.