diff --git a/public/js/admin.js b/public/js/admin.js
new file mode 100644
index 0000000..cfc8aa2
--- /dev/null
+++ b/public/js/admin.js
@@ -0,0 +1,139 @@
+class AdminService {
+    constructor() {
+        if (!window.auth.user?.is_admin) return;
+
+        this.adminPanel = document.getElementById('admin-panel');
+        this.closeAdminBtn = document.getElementById('close-admin-btn');
+        this.addUserBtn = document.getElementById('add-user-btn');
+        this.usersList = document.getElementById('users-list');
+
+        this.setupEventListeners();
+    }
+
+    setupEventListeners() {
+        this.closeAdminBtn.addEventListener('click', () => this.closePanel());
+        this.addUserBtn.addEventListener('click', () => this.showAddUserForm());
+    }
+
+    async loadUsers() {
+        try {
+            const response = await fetch('/api/users', {
+                headers: window.auth.getHeaders()
+            });
+            const users = await response.json();
+            this.renderUsersList(users);
+        } catch (error) {
+            console.error('Error loading users:', error);
+        }
+    }
+
+    renderUsersList(users) {
+        this.usersList.innerHTML = '';
+        users.forEach(user => {
+            const userElement = document.createElement('div');
+            userElement.className = 'user-item';
+            userElement.innerHTML = `
+                <div>
+                    <span class="font-medium">${user.username}</span>
+                    ${user.is_admin ? '<span class="ml-2 text-sm text-blue-600">Admin</span>' : ''}
+                </div>
+                <div class="actions">
+                    ${user.id !== 1 ? `
+                        <button class="text-gray-600 hover:text-blue-600" onclick="window.admin.changePassword(${user.id})">
+                            <i data-lucide="key"></i>
+                        </button>
+                        <button class="text-gray-600 hover:text-blue-600" onclick="window.admin.toggleAdmin(${user.id}, ${user.is_admin})">
+                            <i data-lucide="shield"></i>
+                        </button>
+                        <button class="text-gray-600 hover:text-red-600" onclick="window.admin.deleteUser(${user.id})">
+                            <i data-lucide="trash-2"></i>
+                        </button>
+                    ` : ''}
+                </div>
+            `;
+            this.usersList.appendChild(userElement);
+        });
+        lucide.createIcons();
+    }
+
+    showAddUserForm() {
+        const username = prompt('Nom d\'utilisateur:');
+        if (!username) return;
+
+        const password = prompt('Mot de passe:');
+        if (!password) return;
+
+        const isAdmin = confirm('Donner les droits administrateur ?');
+
+        this.createUser(username, password, isAdmin);
+    }
+
+    async createUser(username, password, isAdmin) {
+        try {
+            const response = await fetch('/api/users', {
+                method: 'POST',
+                headers: window.auth.getHeaders(),
+                body: JSON.stringify({ username, password, is_admin: isAdmin })
+            });
+
+            if (!response.ok) {
+                const error = await response.json();
+                throw new Error(error.message);
+            }
+
+            this.loadUsers();
+        } catch (error) {
+            alert(error.message);
+        }
+    }
+
+    async changePassword(userId) {
+        const password = prompt('Nouveau mot de passe:');
+        if (!password) return;
+
+        try {
+            await fetch(`/api/users/${userId}`, {
+                method: 'PUT',
+                headers: window.auth.getHeaders(),
+                body: JSON.stringify({ password })
+            });
+            alert('Mot de passe modifié');
+        } catch (error) {
+            console.error('Error changing password:', error);
+        }
+    }
+
+    async toggleAdmin(userId, currentStatus) {
+        try {
+            await fetch(`/api/users/${userId}`, {
+                method: 'PUT',
+                headers: window.auth.getHeaders(),
+                body: JSON.stringify({ is_admin: !currentStatus })
+            });
+            this.loadUsers();
+        } catch (error) {
+            console.error('Error toggling admin status:', error);
+        }
+    }
+
+    async deleteUser(userId) {
+        if (!confirm('Êtes-vous sûr de vouloir supprimer cet utilisateur ?')) return;
+
+        try {
+            await fetch(`/api/users/${userId}`, {
+                method: 'DELETE',
+                headers: window.auth.getHeaders()
+            });
+            this.loadUsers();
+        } catch (error) {
+            console.error('Error deleting user:', error);
+        }
+    }
+
+    closePanel() {
+        this.adminPanel.classList.add('hidden');
+    }
+}
+
+// Initialize admin service
+window.admin = new AdminService();
\ No newline at end of file
diff --git a/public/js/app.js b/public/js/app.js
new file mode 100644
index 0000000..f765897
--- /dev/null
+++ b/public/js/app.js
@@ -0,0 +1,21 @@
+class App {
+    constructor() {
+        // Initialize app components
+        this.auth = window.auth;
+        this.notes = window.notes;
+        this.admin = window.admin;
+    }
+
+    init() {
+        // Load initial data if authenticated
+        if (this.auth.token) {
+            this.notes.loadNotes();
+            if (this.auth.user.is_admin) {
+                this.admin.loadUsers();
+            }
+        }
+    }
+}
+
+// Initialize main app
+window.app = new App();
\ No newline at end of file
diff --git a/public/js/notes.js b/public/js/notes.js
new file mode 100644
index 0000000..42512ae
--- /dev/null
+++ b/public/js/notes.js
@@ -0,0 +1,289 @@
+class NotesService {
+    constructor() {
+        this.currentNote = null;
+        this.notes = [];
+        
+        // DOM Elements
+        this.notesList = document.getElementById('notes-list');
+        this.noteEditor = document.getElementById('note-editor');
+        this.noteTitle = document.getElementById('note-title');
+        this.noteContent = document.getElementById('note-content');
+        this.todosList = document.getElementById('todos-list');
+        this.imagesList = document.getElementById('images-list');
+        this.searchInput = document.getElementById('search-notes');
+        this.newNoteBtn = document.getElementById('new-note-btn');
+        this.archiveNoteBtn = document.getElementById('archive-note-btn');
+        this.deleteNoteBtn = document.getElementById('delete-note-btn');
+        this.addTodoBtn = document.getElementById('add-todo-btn');
+        this.imageUpload = document.getElementById('image-upload');
+
+        this.setupEventListeners();
+        this.loadNotes();
+    }
+
+    setupEventListeners() {
+        this.newNoteBtn.addEventListener('click', () => this.createNewNote());
+        this.archiveNoteBtn.addEventListener('click', () => this.toggleArchiveNote());
+        this.deleteNoteBtn.addEventListener('click', () => this.deleteNote());
+        this.addTodoBtn.addEventListener('click', () => this.addTodo());
+        this.imageUpload.addEventListener('change', (e) => this.handleImageUpload(e));
+        this.searchInput.addEventListener('input', (e) => this.handleSearch(e));
+        
+        // Auto-save on content changes
+        this.noteTitle.addEventListener('input', () => this.autoSave());
+        this.noteContent.addEventListener('input', () => this.autoSave());
+        
+        // Initialize Lucide icons
+        lucide.createIcons();
+    }
+
+    async loadNotes() {
+        try {
+            const response = await fetch('/api/notes', {
+                headers: window.auth.getHeaders()
+            });
+            this.notes = await response.json();
+            this.renderNotesList();
+        } catch (error) {
+            console.error('Error loading notes:', error);
+        }
+    }
+
+    renderNotesList(searchTerm = '') {
+        this.notesList.innerHTML = '';
+        
+        const filteredNotes = searchTerm 
+            ? this.notes.filter(note => 
+                note.title.toLowerCase().includes(searchTerm.toLowerCase()) ||
+                note.content.toLowerCase().includes(searchTerm.toLowerCase())
+              )
+            : this.notes;
+
+        filteredNotes.forEach(note => {
+            const noteElement = document.createElement('div');
+            noteElement.className = `note-item ${note.id === this.currentNote?.id ? 'active' : ''}`;
+            noteElement.innerHTML = `
+                <h3 class="font-medium">${note.title || 'Sans titre'}</h3>
+                <p class="text-sm text-gray-500 truncate">${note.content || ''}</p>
+            `;
+            noteElement.addEventListener('click', () => this.selectNote(note));
+            this.notesList.appendChild(noteElement);
+        });
+    }
+
+    selectNote(note) {
+        this.currentNote = note;
+        this.noteTitle.value = note.title;
+        this.noteContent.innerHTML = note.content;
+        this.renderTodos();
+        this.renderImages();
+        this.renderNotesList(); // Update active state
+    }
+
+    renderTodos() {
+        this.todosList.innerHTML = '';
+        this.currentNote.todos.forEach((todo, index) => {
+            const todoElement = document.createElement('div');
+            todoElement.className = `todo-item ${todo.completed ? 'completed' : ''}`;
+            todoElement.innerHTML = `
+                <input type="checkbox" ${todo.completed ? 'checked' : ''}>
+                <span>${todo.text}</span>
+                <button class="ml-auto text-gray-400 hover:text-red-500">
+                    <i data-lucide="x"></i>
+                </button>
+            `;
+            
+            const checkbox = todoElement.querySelector('input');
+            checkbox.addEventListener('change', () => this.toggleTodo(index));
+            
+            const deleteBtn = todoElement.querySelector('button');
+            deleteBtn.addEventListener('click', () => this.deleteTodo(index));
+            
+            this.todosList.appendChild(todoElement);
+        });
+        lucide.createIcons();
+    }
+
+    renderImages() {
+        this.imagesList.innerHTML = '';
+        this.currentNote.images.forEach((image, index) => {
+            const imageElement = document.createElement('div');
+            imageElement.className = 'image-thumbnail';
+            imageElement.innerHTML = `
+                <img src="/uploads/${image.filename}" alt="Note image">
+                <button class="delete-btn">
+                    <i data-lucide="x"></i>
+                </button>
+            `;
+            
+            const deleteBtn = imageElement.querySelector('button');
+            deleteBtn.addEventListener('click', () => this.deleteImage(image.id));
+            
+            this.imagesList.appendChild(imageElement);
+        });
+        lucide.createIcons();
+    }
+
+    async createNewNote() {
+        try {
+            const response = await fetch('/api/notes', {
+                method: 'POST',
+                headers: window.auth.getHeaders(),
+                body: JSON.stringify({
+                    title: 'Nouvelle note',
+                    content: '',
+                    todos: []
+                })
+            });
+            
+            const newNote = await response.json();
+            this.notes.unshift(newNote);
+            this.renderNotesList();
+            this.selectNote(newNote);
+        } catch (error) {
+            console.error('Error creating note:', error);
+        }
+    }
+
+    async autoSave() {
+        if (!this.currentNote) return;
+        
+        clearTimeout(this.saveTimeout);
+        this.saveTimeout = setTimeout(async () => {
+            try {
+                await fetch(`/api/notes/${this.currentNote.id}`, {
+                    method: 'PUT',
+                    headers: window.auth.getHeaders(),
+                    body: JSON.stringify({
+                        title: this.noteTitle.value,
+                        content: this.noteContent.innerHTML,
+                        todos: this.currentNote.todos
+                    })
+                });
+                
+                // Update local note
+                this.currentNote.title = this.noteTitle.value;
+                this.currentNote.content = this.noteContent.innerHTML;
+                this.renderNotesList();
+            } catch (error) {
+                console.error('Error saving note:', error);
+            }
+        }, 1000);
+    }
+
+    async toggleArchiveNote() {
+        if (!this.currentNote) return;
+        
+        try {
+            await fetch(`/api/notes/${this.currentNote.id}`, {
+                method: 'PUT',
+                headers: window.auth.getHeaders(),
+                body: JSON.stringify({
+                    ...this.currentNote,
+                    archived: !this.currentNote.archived
+                })
+            });
+            
+            this.currentNote.archived = !this.currentNote.archived;
+            this.renderNotesList();
+        } catch (error) {
+            console.error('Error archiving note:', error);
+        }
+    }
+
+    async deleteNote() {
+        if (!this.currentNote || !confirm('Êtes-vous sûr de vouloir supprimer cette note ?')) return;
+        
+        try {
+            await fetch(`/api/notes/${this.currentNote.id}`, {
+                method: 'DELETE',
+                headers: window.auth.getHeaders()
+            });
+            
+            const index = this.notes.findIndex(n => n.id === this.currentNote.id);
+            this.notes.splice(index, 1);
+            this.currentNote = null;
+            this.renderNotesList();
+            this.noteTitle.value = '';
+            this.noteContent.innerHTML = '';
+            this.todosList.innerHTML = '';
+            this.imagesList.innerHTML = '';
+        } catch (error) {
+            console.error('Error deleting note:', error);
+        }
+    }
+
+    async addTodo() {
+        if (!this.currentNote) return;
+        
+        const text = prompt('Nouveau todo:');
+        if (!text) return;
+        
+        this.currentNote.todos.push({ text, completed: false });
+        this.renderTodos();
+        this.autoSave();
+    }
+
+    async toggleTodo(index) {
+        if (!this.currentNote) return;
+        
+        this.currentNote.todos[index].completed = !this.currentNote.todos[index].completed;
+        this.renderTodos();
+        this.autoSave();
+    }
+
+    async deleteTodo(index) {
+        if (!this.currentNote) return;
+        
+        this.currentNote.todos.splice(index, 1);
+        this.renderTodos();
+        this.autoSave();
+    }
+
+    async handleImageUpload(event) {
+        if (!this.currentNote || !event.target.files.length) return;
+        
+        const formData = new FormData();
+        formData.append('image', event.target.files[0]);
+        
+        try {
+            const response = await fetch(`/api/notes/${this.currentNote.id}/images`, {
+                method: 'POST',
+                headers: { 'Authorization': window.auth.getHeaders().Authorization },
+                body: formData
+            });
+            
+            const image = await response.json();
+            this.currentNote.images.push(image);
+            this.renderImages();
+        } catch (error) {
+            console.error('Error uploading image:', error);
+        }
+        
+        event.target.value = ''; // Reset input
+    }
+
+    async deleteImage(imageId) {
+        if (!this.currentNote || !confirm('Supprimer cette image ?')) return;
+        
+        try {
+            await fetch(`/api/notes/${this.currentNote.id}/images/${imageId}`, {
+                method: 'DELETE',
+                headers: window.auth.getHeaders()
+            });
+            
+            const index = this.currentNote.images.findIndex(img => img.id === imageId);
+            this.currentNote.images.splice(index, 1);
+            this.renderImages();
+        } catch (error) {
+            console.error('Error deleting image:', error);
+        }
+    }
+
+    handleSearch(event) {
+        this.renderNotesList(event.target.value);
+    }
+}
+
+// Initialize notes service
+window.notes = new NotesService();
\ No newline at end of file