diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookDTO.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookDTO.java
new file mode 100644
index 0000000..b9f8697
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/BookDTO.java
@@ -0,0 +1,21 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book;
+
+
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+
+@Getter
+@Builder
+public class BookDTO {
+    private ArrayList<String> categories = new ArrayList<>();
+    private String description ;
+    private String language;
+    private String title;
+    private String author;
+    private String editor;
+    private LocalDate date;
+
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverter.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverter.java
new file mode 100644
index 0000000..0173a9a
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverter.java
@@ -0,0 +1,22 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.book.converter;
+
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDetails;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+
+public final class BookConverter {
+    private BookConverter(){}
+
+    public static BookDTO ToDomain(BookInfo bookinfo, BookDetails bookdetails){
+        return BookDTO.builder()
+                .title(bookinfo.title())
+                .author(bookinfo.author())
+                .editor(bookinfo.editor())
+                .date(bookinfo.date())
+                .categories(bookdetails.getCategories())
+                .description(bookdetails.getDescription())
+                .language(bookdetails.getLanguage())
+                .build();
+    }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/entity/Book.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/entity/Book.java
index e7ef3db..f1297ea 100644
--- a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/entity/Book.java
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/entity/Book.java
@@ -11,8 +11,8 @@ import java.util.ArrayList;
 @Builder
 public class Book {
     private ArrayList<String> categories = new ArrayList<>();
-    private  String description ;
-    private  String language;
+    private String description ;
+    private String language;
     private String title;
     private String author;
     private String editor;
diff --git a/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverterTest.java b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverterTest.java
index e517aef..5e30473 100644
--- a/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverterTest.java
+++ b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/book/converter/BookConverterTest.java
@@ -4,6 +4,7 @@ import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
 import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
 import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDetails;
 import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -12,7 +13,6 @@ import java.util.ArrayList;
 import java.time.LocalDate;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 @DisplayName("BookConverterTest Unit Tests")
 public class BookConverterTest {
@@ -28,13 +28,13 @@ public class BookConverterTest {
             ArrayList<String> categories = new ArrayList<>();
             categories.add("Thriller");
             categories.add("Biographie");
-            BookDetails.builder()
+            BookDetails bookdetails = BookDetails.builder()
                     .categories(categories)
                     .description("C'était un brave partit trop tôt")
                     .language("Français")
                     .build();
 
-            Book result = BookConvert.ToDomain(bookinfo,bookdetails);
+            BookDTO result = BookConverter.ToDomain(bookinfo, bookdetails);
 
             //assertNotNull(result);
             assertEquals(bookinfo.title(), result.getTitle());