Create a middleware to prettify JSON response.

lib/json_prettify_middleware.rb

@@ -0,0 +1,16 @@
+require "json"
+
+class JsonPrettifyMiddleware
+  def initialize(app)
+    @app = app
+  end
+
+  def call(env)
+    status, headers, response = @app.call(env)
+    if headers["Content-Type"].include? "application/json"
+      objects  = JSON.parse response.first
+      response = JSON.pretty_generate(objects)
+    end
+    [status, headers, response]
+  end
+end