diff --git a/src/library/entry.cr b/src/library/entry.cr
index 5694551..43fbb23 100644
--- a/src/library/entry.cr
+++ b/src/library/entry.cr
@@ -49,7 +49,7 @@ class Entry
     file.close
   end
 
-  def to_slim_json : String
+  def build_json(*, slim = false)
     JSON.build do |json|
       json.object do
         {% for str in ["zip_path", "title", "size", "id"] %}
@@ -57,23 +57,15 @@ class Entry
       {% end %}
         json.field "title_id", @book.id
         json.field "pages" { json.number @pages }
+        unless slim
+          json.field "display_name", @book.display_name @title
+          json.field "cover_url", cover_url
+          json.field "mtime" { json.number @mtime.to_unix }
+        end
       end
     end
   end
 
-  def to_json(json : JSON::Builder)
-    json.object do
-      {% for str in ["zip_path", "title", "size", "id"] %}
-        json.field {{str}}, @{{str.id}}
-      {% end %}
-      json.field "title_id", @book.id
-      json.field "display_name", @book.display_name @title
-      json.field "cover_url", cover_url
-      json.field "pages" { json.number @pages }
-      json.field "mtime" { json.number @mtime.to_unix }
-    end
-  end
-
   def display_name
     @book.display_name @title
   end
diff --git a/src/library/library.cr b/src/library/library.cr
index b50fb87..ea2a5e3 100644
--- a/src/library/library.cr
+++ b/src/library/library.cr
@@ -100,14 +100,14 @@ class Library
     titles.flat_map &.deep_entries
   end
 
-  def to_slim_json : String
+  def build_json(*, slim = false, shallow = false)
     JSON.build do |json|
       json.object do
         json.field "dir", @dir
         json.field "titles" do
           json.array do
             self.titles.each do |title|
-              json.raw title.to_slim_json
+              json.raw title.build_json(slim: slim, shallow: shallow)
             end
           end
         end
@@ -115,15 +115,6 @@ class Library
     end
   end
 
-  def to_json(json : JSON::Builder)
-    json.object do
-      json.field "dir", @dir
-      json.field "titles" do
-        json.raw self.titles.to_json
-      end
-    end
-  end
-
   def get_title(tid)
     @title_hash[tid]?
   end
diff --git a/src/library/title.cr b/src/library/title.cr
index 41efd7c..3abc38d 100644
--- a/src/library/title.cr
+++ b/src/library/title.cr
@@ -167,62 +167,50 @@ class Title
     true # Fixed, reuse this
   end
 
-  def to_slim_json : String
+  alias SortContext = NamedTuple(username: String, opt: SortOptions)
+
+  def build_json(*, slim = false, shallow = false,
+                 sort_context : SortContext? = nil)
     JSON.build do |json|
       json.object do
         {% for str in ["dir", "title", "id"] %}
         json.field {{str}}, @{{str.id}}
       {% end %}
         json.field "signature" { json.number @signature }
-        json.field "titles" do
-          json.array do
-            self.titles.each do |title|
-              json.raw title.to_slim_json
-            end
-          end
+        unless slim
+          json.field "display_name", display_name
+          json.field "cover_url", cover_url
+          json.field "mtime" { json.number @mtime.to_unix }
         end
-        json.field "entries" do
-          json.array do
-            @entries.each do |entry|
-              json.raw entry.to_slim_json
-            end
-          end
-        end
-        json.field "parents" do
-          json.array do
-            self.parents.each do |title|
-              json.object do
-                json.field "title", title.title
-                json.field "id", title.id
+        unless shallow
+          json.field "titles" do
+            json.array do
+              self.titles.each do |title|
+                json.raw title.build_json(slim: slim, shallow: shallow)
               end
             end
           end
-        end
-      end
-    end
-  end
-
-  def to_json(json : JSON::Builder)
-    json.object do
-      {% for str in ["dir", "title", "id"] %}
-        json.field {{str}}, @{{str.id}}
-      {% end %}
-      json.field "signature" { json.number @signature }
-      json.field "display_name", display_name
-      json.field "cover_url", cover_url
-      json.field "mtime" { json.number @mtime.to_unix }
-      json.field "titles" do
-        json.raw self.titles.to_json
-      end
-      json.field "entries" do
-        json.raw @entries.to_json
-      end
-      json.field "parents" do
-        json.array do
-          self.parents.each do |title|
-            json.object do
-              json.field "title", title.title
-              json.field "id", title.id
+          json.field "entries" do
+            json.array do
+              _entries = if sort_context
+                           sorted_entries sort_context[:username],
+                             sort_context[:opt]
+                         else
+                           @entries
+                         end
+              _entries.each do |entry|
+                json.raw entry.build_json(slim: slim)
+              end
+            end
+          end
+          json.field "parents" do
+            json.array do
+              self.parents.each do |title|
+                json.object do
+                  json.field "title", title.title
+                  json.field "id", title.id
+                end
+              end
             end
           end
         end
diff --git a/src/routes/api.cr b/src/routes/api.cr
index b1fb3b3..8c66e13 100644
--- a/src/routes/api.cr
+++ b/src/routes/api.cr
@@ -133,24 +133,34 @@ struct APIRouter
     end
 
     Koa.describe "Returns the book with title `tid`", <<-MD
-    Supply the `tid` query parameter to strip away "display_name", "cover_url", and "mtime" from the returned object to speed up the loading time
+    - Supply the `slim` query parameter to strip away "display_name", "cover_url", and "mtime" from the returned object to speed up the loading time
+    - Supply the `shallow` query parameter to get only the title information, without the list of entries and nested titles
     MD
     Koa.path "tid", desc: "Title ID"
     Koa.query "slim"
+    Koa.query "shallow"
+    Koa.query "sort", desc: "Sorting option for entries. Can be one of 'auto', 'title', 'progress', 'time_added' and 'time_modified'"
+    Koa.query "ascend", desc: "Sorting direction for entries. Set to 0 for the descending order. Doesn't work without specifying 'sort'"
     Koa.response 200, schema: "title"
     Koa.response 404, "Title not found"
     Koa.tag "library"
     get "/api/book/:tid" do |env|
       begin
+        username = get_username env
+
+        sort_opt = SortOptions.new
+        get_sort_opt
+
         tid = env.params.url["tid"]
         title = Library.default.get_title tid
         raise "Title ID `#{tid}` not found" if title.nil?
 
-        if env.params.query["slim"]?
-          send_json env, title.to_slim_json
-        else
-          send_json env, title.to_json
-        end
+        slim = !env.params.query["slim"]?.nil?
+        shallow = !env.params.query["shallow"]?.nil?
+
+        send_json env, title.build_json(slim: slim, shallow: shallow,
+          sort_context: {username: username,
+                         opt:      sort_opt})
       rescue e
         Logger.error e
         env.response.status_code = 404
@@ -159,20 +169,21 @@ struct APIRouter
     end
 
     Koa.describe "Returns the entire library with all titles and entries", <<-MD
-    Supply the `tid` query parameter to strip away "display_name", "cover_url", and "mtime" from the returned object to speed up the loading time
+    - Supply the `slim` query parameter to strip away "display_name", "cover_url", and "mtime" from the returned object to speed up the loading time
+    - Supply the `shallow` query parameter to get only the top-level titles, without the nested titles and entries
     MD
     Koa.query "slim"
+    Koa.query "shallow"
     Koa.response 200, schema: {
       "dir"    => String,
       "titles" => ["title"],
     }
     Koa.tag "library"
     get "/api/library" do |env|
-      if env.params.query["slim"]?
-        send_json env, Library.default.to_slim_json
-      else
-        send_json env, Library.default.to_json
-      end
+      slim = !env.params.query["slim"]?.nil?
+      shallow = !env.params.query["shallow"]?.nil?
+
+      send_json env, Library.default.build_json(slim: slim, shallow: shallow)
     end
 
     Koa.describe "Triggers a library scan"