diff --git a/src/library/title.cr b/src/library/title.cr
index 2d4e347..0b91603 100644
--- a/src/library/title.cr
+++ b/src/library/title.cr
@@ -63,7 +63,10 @@ class Title
     end
   end
 
-  def build_json(json : JSON::Builder, *, slim = false, shallow = false)
+  alias SortContext = NamedTuple(username: String, opt: SortOptions)
+
+  def build_json(json : JSON::Builder, *, slim = false, shallow = false,
+                 sort_context : SortContext? = nil)
     json.object do
       {% for str in ["dir", "title", "id"] %}
         json.field {{str}}, @{{str.id}}
@@ -87,7 +90,13 @@ class Title
         end
         json.field "entries" do
           json.array do
-            @entries.each do |entry|
+            _entries = if sort_context
+                         sorted_entries sort_context[:username],
+                           sort_context[:opt]
+                       else
+                         @entries
+                       end
+            _entries.each do |entry|
               raw = JSON.build do |j|
                 entry.build_json j, slim: slim
               end
diff --git a/src/routes/api.cr b/src/routes/api.cr
index 924085b..3dc878e 100644
--- a/src/routes/api.cr
+++ b/src/routes/api.cr
@@ -139,11 +139,18 @@ struct APIRouter
     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?
@@ -152,7 +159,8 @@ struct APIRouter
         shallow = !env.params.query["shallow"]?.nil?
 
         json = JSON.build do |j|
-          title.build_json j, slim: slim, shallow: shallow
+          title.build_json j, slim: slim, shallow: shallow,
+            sort_context: {username: username, opt: sort_opt}
         end
       rescue e
         Logger.error e