diff --git a/modele/Cellule.js b/modele/Cellule.js
index 35496cc4e474cb8127416d803f5fc8e1da1e3262..b0295bc627a2bb7546b6764510e737efdbba5067 100644
--- a/modele/Cellule.js
+++ b/modele/Cellule.js
@@ -1,11 +1,14 @@
+const Component = require("./Component");
+
 class Cellule extends Component{
   
     #numero;
     #expression;
 
-    constructor(numero) {
+    constructor(numero, expression = null) {
         super();
         this.#numero = numero;
+        this.#expression = expression;
     }
 
     setExpression(expression){
diff --git a/modele/Component.js b/modele/Component.js
index 6a5832899c337b06fe4992d3f4cc687a5a36c045..b4bab166c26bdb8e47c31f7af647e8852248929d 100644
--- a/modele/Component.js
+++ b/modele/Component.js
@@ -8,4 +8,6 @@ class Component{
     getNom(){
         return this.#nom;
     }
-}
\ No newline at end of file
+}
+
+module.exports = Component;
\ No newline at end of file
diff --git a/modele/Document.js b/modele/Document.js
index b813ad38b267010a79ee1be78cc59ba2e7b18687..52f6a7f0b8621da564d7ec0e5f70fb61dea1ccd4 100644
--- a/modele/Document.js
+++ b/modele/Document.js
@@ -1,3 +1,6 @@
+const Component = require("./Component");
+const Feuille = require("./Feuille");
+
 class Document extends Component{
 
     #feuilles;
@@ -52,7 +55,7 @@ class Document extends Component{
     toJSON(){
 
         let feuillesJSON = [];
-        feuilles.forEach(feuille => feuillesJSON.push(feuille.toJSON()));
+        this.#feuilles.forEach(feuille => feuillesJSON.push(feuille.toJSON()));
 
         return {
             id: this.#id,
diff --git a/modele/Expression.js b/modele/Expression.js
index ef00cd7dc72a2bfa595522f769289266262e6b02..860cd42a8adafbb522dcc4a7ccf83e00366c5a49 100644
--- a/modele/Expression.js
+++ b/modele/Expression.js
@@ -20,4 +20,6 @@ class Expression{
     toJSON(){
         return this.#contenu;
     }
-}
\ No newline at end of file
+}
+
+module.exports = Expression;
\ No newline at end of file
diff --git a/modele/Feuille.js b/modele/Feuille.js
index 80ff5c4ab53a25feb8f804dd58567f059e14c1af..ecfb2c791a741f5157c260e5b836af252a3a0cc0 100644
--- a/modele/Feuille.js
+++ b/modele/Feuille.js
@@ -1,17 +1,17 @@
-const e = require("express");
+const Component = require("./Component");
 
 class Feuille extends Component{
 
     #cells;
     #parent; //objet Document
 
-    constructor(){
-        super("Sans titre", parent = null);
-        this.#cells = [[]]; //TODO: définir la taille de la feuille
+    constructor(parent = null){
+        super("Sans titre");
+        this.#cells = [[],[]]; //TODO: définir la taille de la feuille
     }
 
-    addCell(cell){
-        this.#cells.push(cell);
+    addCell(cell,row){
+        this.#cells[row].push(cell);
     }
 
     removeCell(id){
@@ -23,9 +23,11 @@ class Feuille extends Component{
     }
 
     toJSON(){
-
         let cellsJSON = [];
-        cells.forEach(cell => cellsJSON.push(cell.toJSON()));
+
+        for (let i = 0; i < this.#cells.length; i++){
+            this.#cells[i].forEach(cell => cellsJSON.push(cell.toJSON()));
+        }
 
         return {
             nom: super.getNom(),
diff --git a/modele/Nombre.js b/modele/Nombre.js
index a27af62042eedc0cd2e6b457d63b284d0400c950..72dffbbbe92a2d51b2167c519957c9c65c9a4fcd 100644
--- a/modele/Nombre.js
+++ b/modele/Nombre.js
@@ -1,3 +1,5 @@
+const Expression = require("./Expression");
+
 class Nombre extends Expression{
 
     constructor(content){
@@ -11,4 +13,6 @@ class Nombre extends Expression{
     isNombre(){
         return true;
     }
-}
\ No newline at end of file
+}
+
+module.exports = Nombre;
\ No newline at end of file
diff --git a/modele/Texte.js b/modele/Texte.js
index c30ce27333fc103f5e2a1406e442bd273d6d1398..fc74922722739317f54e894eca6ecdf82fcf69f7 100644
--- a/modele/Texte.js
+++ b/modele/Texte.js
@@ -1,3 +1,5 @@
+const Expression = require("./Expression");
+
 class Texte extends Expression{
 
     constructor(content){
@@ -11,4 +13,6 @@ class Texte extends Expression{
     isTexte(){
         return true;
     }
-}
\ No newline at end of file
+}
+
+module.exports = Texte;
\ No newline at end of file
diff --git a/package.json b/package.json
index 0a33d6e0f7d6b4bbaf162c830fdead40b0eebdca..555f42ddc7b83e8d77932372abffa4a528ab7932 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "collabsheet",
-  "version": "0.0.1",
+  "version": "0.2.1",
   "description": "Tableau collaboratif",
   "main": "index.js",
   "scripts": {