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⚑ CodeSync β€” Pro Real-time Collaborative IDE

Build, share, and collaborate on code with instant synchronization, live activity monitoring, and enterprise-grade performance.


πŸ“‘ Table of Contents


🌐 Overview

CodeSync is a full-stack, real-time collaborative IDE that enables multiple developers to write, edit, and manage code simultaneously within shared workspaces. It features a professional-grade Monaco Editor, role-based access control (RBAC), live cursor tracking, version history, activity feeds, and instant file synchronization β€” all wrapped in a premium dark-theme UI inspired by Linear, Vercel, and Render.


πŸ“Έ Screenshots

Login (Split-Screen Auth) Dashboard & Workspace Management Collaborative IDE
Login Page Dashboard Workspace IDE

πŸ—οΈ Architecture & Flowcharts

High-Level System Architecture

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚                          CLIENT (Browser)                           β”‚
β”‚                                                                     β”‚
β”‚  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”  β”‚
β”‚  β”‚   React 18   β”‚  β”‚  Monaco      β”‚  β”‚    Socket.IO Client      β”‚  β”‚
β”‚  β”‚   + Vite     β”‚  β”‚  Editor      β”‚  β”‚  (Real-time events)      β”‚  β”‚
β”‚  β””β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”˜  β””β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”˜  β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜  β”‚
β”‚         β”‚                 β”‚                        β”‚                β”‚
β”‚         β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜                β”‚
β”‚                           β”‚                                         β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                            β”‚  HTTP REST + WebSocket (wss://)
                            β–Ό
β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚                        SERVER (Node.js)                             β”‚
β”‚                                                                     β”‚
β”‚  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”  β”‚
β”‚  β”‚   Express    β”‚  β”‚  Socket.IO   β”‚  β”‚  Middleware Layer         β”‚  β”‚
β”‚  β”‚   REST API   β”‚  β”‚  Server      β”‚  β”‚  (Auth, RBAC, FileAccess)β”‚  β”‚
β”‚  β””β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”˜  β””β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”˜  β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜  β”‚
β”‚         β”‚                 β”‚                                         β”‚
β”‚         β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”˜                                         β”‚
β”‚                   β”‚                                                 β”‚
β”‚  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β–Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”   β”‚
β”‚  β”‚  Controllers: Auth | Workspace | File | Member | Version    β”‚   β”‚
β”‚  β”‚                     Activity | Session | Ownership           β”‚   β”‚
β”‚  β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜   β”‚
β”‚                              β”‚                                      β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                               β”‚
                               β–Ό
                    β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
                    β”‚    MongoDB Atlas     β”‚
                    β”‚                     β”‚
                    β”‚  Users              β”‚
                    β”‚  Workspaces         β”‚
                    β”‚  WorkspaceMembers   β”‚
                    β”‚  Files              β”‚
                    β”‚  FileVersions       β”‚
                    β”‚  ActivityLogs       β”‚
                    β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

User Authentication Workflow

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”    POST /api/auth/signup     β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚          β”‚ ──────────────────────────▢   β”‚          β”‚
β”‚  Client  β”‚    { username, email, pwd }  β”‚  Server  β”‚
β”‚          β”‚                              β”‚          β”‚
β”‚          β”‚    POST /api/auth/login       β”‚          β”‚
β”‚          β”‚ ──────────────────────────▢   β”‚          β”‚
β”‚          β”‚    { email, password }        β”‚          β”‚
β”‚          β”‚                              β”‚          β”‚
β”‚          β”‚  ◀────────────────────────── β”‚          β”‚
β”‚          β”‚    { token, user }           β”‚          β”‚
β”‚          β”‚                              β”‚          β”‚
β”‚          β”‚  ─── All subsequent reqs ──▢ β”‚          β”‚
β”‚          β”‚    Authorization: Bearer JWT β”‚          β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜                              β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                                               β”‚
                                               β–Ό
                                        β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
                                        β”‚  bcrypt hash  β”‚
                                        β”‚  + JWT sign   β”‚
                                        β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

Real-Time Collaboration Workflow

 User A (Editor)                   Server                    User B (Editor)
       β”‚                              β”‚                              β”‚
       β”‚   join_workspace             β”‚                              β”‚
       β”‚ ────────────────────────────▢│                              β”‚
       β”‚                              β”‚  user_joined (broadcast)     β”‚
       β”‚                              │─────────────────────────────▢│
       β”‚                              β”‚                              β”‚
       β”‚   join_file (fileId)         β”‚                              β”‚
       β”‚ ────────────────────────────▢│                              β”‚
       β”‚                              β”‚                              β”‚
       β”‚   code_change (content)      β”‚                              β”‚
       β”‚ ────────────────────────────▢│                              β”‚
       β”‚                              β”‚  code_update (debounced)     β”‚
       β”‚                              │─────────────────────────────▢│
       β”‚                              β”‚                              β”‚
       β”‚   cursor_position            β”‚                              β”‚
       β”‚ ────────────────────────────▢│                              β”‚
       β”‚                              β”‚  cursor_update (throttled)   β”‚
       β”‚                              │─────────────────────────────▢│
       β”‚                              β”‚                              β”‚
       β”‚                              β”‚  file_created / deleted      β”‚
       β”‚                              │◀────────────────────────────▢│
       β”‚                              β”‚  (synced to all clients)     β”‚
       β”‚                              β”‚                              β”‚
       β”‚   disconnect                 β”‚                              β”‚
       β”‚ ────────────────────────────▢│                              β”‚
       β”‚                              β”‚  user_left (broadcast)       β”‚
       β”‚                              │─────────────────────────────▢│

RBAC Permission Model

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚                     ROLE HIERARCHY                          β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚          β”‚                                                 β”‚
β”‚  OWNER   β”‚  βœ… All permissions                             β”‚
β”‚          β”‚  βœ… Delete workspace                            β”‚
β”‚          β”‚  βœ… Invite / remove members                     β”‚
β”‚          β”‚  βœ… Change member roles                         β”‚
β”‚          β”‚  βœ… Transfer ownership                          β”‚
β”‚          β”‚  βœ… Update workspace settings                   β”‚
β”‚          β”‚  βœ… Create / edit / rename / delete files       β”‚
β”‚          β”‚  βœ… Save & restore version history              β”‚
β”‚          β”‚  βœ… View all files & activity                   β”‚
β”‚          β”‚                                                 β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚          β”‚                                                 β”‚
β”‚  EDITOR  β”‚  ❌ Cannot manage members or settings           β”‚
β”‚          β”‚  βœ… Create / edit / rename / delete files       β”‚
β”‚          β”‚  βœ… Save & restore version history              β”‚
β”‚          β”‚  βœ… Real-time code editing & cursor sync        β”‚
β”‚          β”‚  βœ… View all files & activity                   β”‚
β”‚          β”‚                                                 β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚          β”‚                                                 β”‚
β”‚  VIEWER  β”‚  ❌ Cannot edit or create files                 β”‚
β”‚          β”‚  ❌ Code changes are blocked at socket level    β”‚
β”‚          β”‚  βœ… View all files (read-only)                  β”‚
β”‚          β”‚  βœ… View activity feed                          β”‚
β”‚          β”‚                                                 β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

File Operations Workflow

                    β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
                    β”‚  File Explorer   β”‚
                    β”‚   (Frontend)     β”‚
                    β””β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                             β”‚
              β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
              β–Ό              β–Ό              β–Ό
       β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β” β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β” β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
       β”‚ Create Fileβ”‚ β”‚  Rename   β”‚ β”‚   Delete   β”‚
       β”‚ /Folder    β”‚ β”‚ File/Fold β”‚ β”‚  File/Fold β”‚
       β””β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”˜ β””β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”˜ β””β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”˜
              β”‚              β”‚              β”‚
              β–Ό              β–Ό              β–Ό
       β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
       β”‚          REST API (Express)              β”‚
       β”‚    POST /api/files                       β”‚
       β”‚    PATCH /api/files/rename/:id           β”‚
       β”‚    DELETE /api/files/:id                 β”‚
       β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                        β”‚
              β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”
              β–Ό         β–Ό         β–Ό
       β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β” β”Œβ”€β”€β”€β”€β”€β”€β” β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
       β”‚ Name      β”‚ β”‚ RBAC β”‚ β”‚ Activity β”‚
       β”‚ Normalize β”‚ β”‚Check β”‚ β”‚ Logging  β”‚
       β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜ β””β”€β”€β”€β”€β”€β”€β”˜ β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
                        β”‚
                        β–Ό
              β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
              β”‚  Socket.IO emit  β”‚
              β”‚  file_created /  β”‚
              β”‚  file_renamed /  β”‚
              β”‚  file_deleted    β”‚
              β”‚  (all clients)   β”‚
              β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

βœ… Feature Status β€” What's Implemented vs. Planned

βœ… Implemented Features

Category Feature Status
Authentication User Registration (signup) βœ… Done
Authentication User Login (JWT-based) βœ… Done
Authentication Protected Routes (frontend guard) βœ… Done
Authentication Token verification middleware βœ… Done
Workspace Create workspace with language template βœ… Done
Workspace List user's workspaces (with roles) βœ… Done
Workspace View workspace details (files, members) βœ… Done
Workspace Delete workspace (owner only, cascading) βœ… Done
Workspace Update workspace settings (name, language) βœ… Done
Collaboration Real-time code sync via Socket.IO βœ… Done
Collaboration Live cursor position tracking βœ… Done
Collaboration User presence indicators (join/leave) βœ… Done
Collaboration Debounced auto-save to MongoDB βœ… Done
File Management Create files & folders βœ… Done
File Management Rename files & folders (with child path update) βœ… Done
File Management Delete files & folders (recursive) βœ… Done
File Management Case-insensitive duplicate name prevention βœ… Done
File Management File name normalization (sanitize specials) βœ… Done
File Management Multi-level nested folder structure βœ… Done
Version History Save file version snapshots βœ… Done
Version History View version history per file βœ… Done
Version History Restore to a previous version βœ… Done
Members Invite member by email βœ… Done
Members Join workspace via Room ID βœ… Done
Members Change member roles (owner action) βœ… Done
Members Remove member from workspace βœ… Done
Members Transfer workspace ownership βœ… Done
Members Members panel with live online status βœ… Done
RBAC Owner / Editor / Viewer role enforcement βœ… Done
RBAC Socket-level viewer write blocking βœ… Done
RBAC Route-level role middleware βœ… Done
Activity Activity logging (joins, edits, role changes) βœ… Done
Activity Real-time activity feed sidebar βœ… Done
Session Leave workspace session (manual) βœ… Done
Session Auto-cleanup on socket disconnect βœ… Done
UI/UX Premium dark theme (Linear/Vercel inspired) βœ… Done
UI/UX Split-screen auth pages βœ… Done
UI/UX Shimmer skeleton loaders βœ… Done
UI/UX Route-based lazy loading βœ… Done
UI/UX Hover prefetch navigation βœ… Done
Performance HTTP gzip compression βœ… Done
Performance .lean() Mongoose queries βœ… Done
Performance Compound indexes on MongoDB βœ… Done
Multi-Language JS, TS, Python, C++, Java, Go, Rust templates βœ… Done
Services User cascade delete (files, members, logs) βœ… Done

πŸ”œ Planned / Not Yet Implemented

Category Feature Status
Auth OAuth2 (GitHub/Google SSO) πŸ”œ Planned
Auth Password reset / forgot password πŸ”œ Planned
Auth Email verification on signup πŸ”œ Planned
Collaboration Integrated terminal (run code in-browser) πŸ”œ Planned
Collaboration In-editor chat / comments πŸ”œ Planned
Collaboration Conflict resolution (OT / CRDT) πŸ”œ Planned
File Management Drag-and-drop file/folder reorder πŸ”œ Planned
File Management File upload / download πŸ”œ Planned
File Management File search across workspace πŸ”œ Planned
Workspace Workspace templates / cloning πŸ”œ Planned
Workspace Workspace privacy (public/private toggle) πŸ”œ Planned
Notifications In-app notification system πŸ”œ Planned
Notifications Email notifications for invites πŸ”œ Planned
DevOps Docker containerization πŸ”œ Planned
DevOps CI/CD pipeline πŸ”œ Planned
Testing Unit & integration test suite πŸ”œ Planned
UI Light theme / theme toggle πŸ”œ Planned
UI Mobile responsive layout πŸ”œ Planned

πŸ”‘ Key Features Deep Dive

🧠 Monaco Editor Integration

The in-browser IDE is powered by Monaco Editor (the same engine behind VS Code), providing:

  • Syntax highlighting for 7+ languages
  • IntelliSense / autocomplete
  • Minimap preview
  • Multi-cursor editing
  • Bracket pairing and indentation

⚑ Real-Time Synchronization

  • Code changes are broadcast via Socket.IO with debounced auto-save (5-second delay) to reduce DB writes.
  • Cursor positions are throttled and broadcast to all participants viewing the same file.
  • File operations (create, rename, delete) are instantly pushed to all connected clients.
  • User presence is tracked β€” join/leave events are emitted in real time.

πŸ“‚ Hierarchical File System

Full support for nested directory structures:

  • / root-level files
  • /src/, /src/components/, etc.
  • Folders can be created, renamed, and deleted recursively (all child files/folders are cleaned up).
  • Names are normalized and sanitized (trimmed, special characters stripped, case-insensitive uniqueness enforced via compound indexes).

πŸ•‘ Version History

Any editor can snapshot the current state of a file. The full history of snapshots is viewable, and any past version can be restored β€” effectively a manual "git" within the IDE.

🀝 Multi-Method Workspace Sharing

  1. Invite by Email β€” Owner enters a registered user's email and assigns a role.
  2. Join by Room ID β€” Any registered user can paste a workspace ID and join (defaults to editor role).

πŸ”’ Ownership Transfer

Workspace owners can transfer ownership to any existing member. The previous owner is demoted to editor, and the new owner gets full admin privileges.


πŸ› οΈ Tech Stack

Layer Technology Purpose
Frontend Framework React 18 + Vite SPA with fast HMR and lazy loading
Code Editor Monaco Editor VS Code-grade in-browser editing
Styling CSS3 + Tailwind CSS 4 Dark theme, glassmorphism, animations
Routing React Router v6 Client-side navigation with protected routes
HTTP Client Axios REST API communication
Notifications React Hot Toast In-app toast notifications
Backend Runtime Node.js (ES Modules) Server runtime
API Framework Express.js REST endpoint handling
Real-Time Engine Socket.IO WebSocket bidirectional events
Database MongoDB (Mongoose 8) Document store with indexing
Auth JWT + bcrypt Stateless token auth with hashed passwords
Compression compression (gzip) Response payload optimization
Dev Server Nodemon Auto-restart on backend file changes

πŸ“‚ Project Structure

CodeSync/
β”‚
β”œβ”€β”€ assets/                          # Screenshots for README
β”‚   β”œβ”€β”€ login.png
β”‚   β”œβ”€β”€ dashboard.png
β”‚   └── workspace.png
β”‚
β”œβ”€β”€ backend/
β”‚   β”œβ”€β”€ controllers/
β”‚   β”‚   β”œβ”€β”€ activityController.js    # GET activity logs
β”‚   β”‚   β”œβ”€β”€ authController.js        # Signup / Login (JWT)
β”‚   β”‚   β”œβ”€β”€ fileController.js        # CRUD files & folders
β”‚   β”‚   β”œβ”€β”€ memberController.js      # Invite, join, role change, remove
β”‚   β”‚   β”œβ”€β”€ ownershipController.js   # Transfer workspace ownership
β”‚   β”‚   β”œβ”€β”€ sessionController.js     # Leave workspace session
β”‚   β”‚   β”œβ”€β”€ versionController.js     # Save / view / restore versions
β”‚   β”‚   └── workspaceController.js   # CRUD workspaces + settings
β”‚   β”‚
β”‚   β”œβ”€β”€ middleware/
β”‚   β”‚   β”œβ”€β”€ authMiddleware.js        # JWT token verification
β”‚   β”‚   β”œβ”€β”€ filePermission.js        # Verify user access to file's workspace
β”‚   β”‚   β”œβ”€β”€ permissionMiddleware.js  # RBAC role checks (isOwner, isEditor, requireRole)
β”‚   β”‚   └── workspaceAuth.js         # Workspace membership verification
β”‚   β”‚
β”‚   β”œβ”€β”€ models/
β”‚   β”‚   β”œβ”€β”€ ActivityLog.js           # Action audit trail (indexed)
β”‚   β”‚   β”œβ”€β”€ File.js                  # Files & folders (compound unique index)
β”‚   β”‚   β”œβ”€β”€ FileVersion.js           # Version snapshots
β”‚   β”‚   β”œβ”€β”€ User.js                  # User accounts (bcrypt hashed)
β”‚   β”‚   β”œβ”€β”€ Workspace.js             # Workspace metadata
β”‚   β”‚   └── WorkspaceMember.js       # User-workspace membership & role
β”‚   β”‚
β”‚   β”œβ”€β”€ routes/
β”‚   β”‚   β”œβ”€β”€ authRoutes.js            # /api/auth/*
β”‚   β”‚   β”œβ”€β”€ fileRoutes.js            # /api/files/*
β”‚   β”‚   └── workspaceRoutes.js       # /api/workspaces/*
β”‚   β”‚
β”‚   β”œβ”€β”€ services/
β”‚   β”‚   └── deleteUserCascade.js     # Cascade-delete user data
β”‚   β”‚
β”‚   β”œβ”€β”€ utils/
β”‚   β”‚   └── logger.js                # Activity logging utility
β”‚   β”‚
β”‚   β”œβ”€β”€ server.js                    # Express + Socket.IO entry point
β”‚   β”œβ”€β”€ .env.example                 # Environment template
β”‚   └── package.json
β”‚
β”œβ”€β”€ frontend/
β”‚   β”œβ”€β”€ src/
β”‚   β”‚   β”œβ”€β”€ components/
β”‚   β”‚   β”‚   β”œβ”€β”€ ActivityFeed.jsx     # Live activity sidebar
β”‚   β”‚   β”‚   β”œβ”€β”€ CreateWorkspaceModal.jsx  # Create workspace dialog
β”‚   β”‚   β”‚   β”œβ”€β”€ FileExplorer.jsx     # Tree-view file browser
β”‚   β”‚   β”‚   β”œβ”€β”€ InviteModal.jsx      # Email invite dialog
β”‚   β”‚   β”‚   β”œβ”€β”€ JoinWorkspaceModal.jsx    # Join via Room ID
β”‚   β”‚   β”‚   β”œβ”€β”€ MembersPanel.jsx     # Online members list with roles
β”‚   β”‚   β”‚   β”œβ”€β”€ ShareWorkspaceModal.jsx   # Share workspace dialog
β”‚   β”‚   β”‚   └── VersionHistory.jsx   # File version timeline
β”‚   β”‚   β”‚
β”‚   β”‚   β”œβ”€β”€ context/
β”‚   β”‚   β”‚   └── AuthContext.jsx      # Auth state provider
β”‚   β”‚   β”‚
β”‚   β”‚   β”œβ”€β”€ pages/
β”‚   β”‚   β”‚   β”œβ”€β”€ Dashboard.jsx        # Workspace listing & management
β”‚   β”‚   β”‚   β”œβ”€β”€ Login.jsx            # Split-screen login
β”‚   β”‚   β”‚   β”œβ”€β”€ Signup.jsx           # Split-screen signup
β”‚   β”‚   β”‚   └── Workspace.jsx        # Collaborative IDE view
β”‚   β”‚   β”‚
β”‚   β”‚   β”œβ”€β”€ routes/
β”‚   β”‚   β”‚   └── ProtectedRoute.jsx   # Auth guard wrapper
β”‚   β”‚   β”‚
β”‚   β”‚   β”œβ”€β”€ services/
β”‚   β”‚   β”‚   β”œβ”€β”€ api.js               # Axios instance (base URL + token)
β”‚   β”‚   β”‚   β”œβ”€β”€ fileApi.js           # File CRUD API calls
β”‚   β”‚   β”‚   β”œβ”€β”€ memberApi.js         # Member management API calls
β”‚   β”‚   β”‚   └── workspaceApi.js      # Workspace API calls
β”‚   β”‚   β”‚
β”‚   β”‚   β”œβ”€β”€ App.jsx                  # Root router + lazy loader
β”‚   β”‚   β”œβ”€β”€ main.jsx                 # React DOM entry point
β”‚   β”‚   └── index.css                # Global styles & design system
β”‚   β”‚
β”‚   β”œβ”€β”€ index.html                   # HTML shell
β”‚   β”œβ”€β”€ vite.config.js               # Vite config
β”‚   β”œβ”€β”€ tailwind.config.js           # Tailwind CSS 4 config
β”‚   β”œβ”€β”€ postcss.config.js            # PostCSS config
β”‚   └── package.json
β”‚
β”œβ”€β”€ Readme.md                        # Original README (legacy)
β”œβ”€β”€ README.md                        # ← You are here
└── .gitignore

πŸ“‘ API Reference

Auth Routes β€” /api/auth

Method Endpoint Description Auth Required
POST /signup Register a new user ❌
POST /login Login and receive JWT ❌

Workspace Routes β€” /api/workspaces

Method Endpoint Description Min. Role
POST / Create a new workspace Authenticated
GET / List user's workspaces Authenticated
GET /:id Get workspace details (files, members) Viewer
DELETE /:id Delete workspace + cascade Owner
PATCH /:id/settings Update name & language Owner
GET /:id/activity Get activity log Viewer
DELETE /:id/session Leave workspace session Authenticated
POST /:id/invite Invite user by email Owner
POST /:id/join Join workspace via Room ID Authenticated
PATCH /:id/role Change member role Owner
DELETE /:id/member/:userId Remove a member Owner
POST /:id/transfer Transfer ownership Owner

File Routes β€” /api/files

Method Endpoint Description Min. Role
POST / Create file or folder Editor
GET /open/:id Get file content Viewer
PUT /:id Update file content Editor
PATCH /rename/:id Rename file or folder Editor
DELETE /:id Delete file or folder (recursive) Editor
POST /:fileId/version Save version snapshot Editor
GET /:fileId/history Get version history Viewer
POST /restore/:versionId Restore a file version Editor

πŸ”Œ Socket.IO Real-Time Events

Client β†’ Server

Event Payload Description
join_workspace { workspaceId, userId, username, color } Join a workspace room
join_file { fileId, username, color } Join a file editing room
leave_file { fileId } Leave a file editing room
code_change { fileId, code, userId } Send code changes (debounced save)
cursor_position { fileId, position, username, color } Broadcast cursor location

Server β†’ Client

Event Payload Description
user_joined { userId, profileId, username, color, role } A user joined the workspace
user_left { userId, username } A user left the workspace
code_update { fileId, code } Code was changed by another user
cursor_update { userId, position, username, color } Cursor moved by another user
file_created { file } A new file/folder was created
file_renamed { fileId, name, oldName, path } A file/folder was renamed
file_deleted { fileId } A file/folder was deleted
folder_children_deleted { parentPath } Children of a folder were deleted
member_updated { userId, role, oldRole } A member's role was changed
member_removed { userId } A member was removed
member_joined { _id, user, role } A new member joined
activity_update β€” Refresh activity feed

πŸ—ƒοΈ Database Models

User

Field Type Details
username String Required, trimmed
email String Required, unique, lowercase
password String bcrypt-hashed
timestamps Auto createdAt, updatedAt

Workspace

Field Type Details
name String Required, max 80 chars
owner ObjectId β†’ User Required
language Enum javascript, typescript, python, java, cpp, go, rust, html, css, json, txt

WorkspaceMember

Field Type Details
workspaceId ObjectId β†’ Workspace Required
userId ObjectId β†’ User Required
role Enum owner / editor / viewer
invitedBy ObjectId β†’ User Optional

File

Field Type Details
workspaceId ObjectId β†’ Workspace Required
name String Required, trimmed
nameLower String Auto (pre-save hook)
path String Directory path, default /
type Enum file / folder
content String File contents
language String Auto-detected from extension
createdBy ObjectId β†’ User β€”
lastEditedBy ObjectId β†’ User β€”
Index Compound Unique (workspaceId, path, nameLower)

FileVersion

Field Type Details
fileId ObjectId β†’ File Required
content String Snapshot content
editedBy ObjectId β†’ User Required

ActivityLog

Field Type Details
workspaceId ObjectId β†’ Workspace Required
userId ObjectId β†’ User Required
actionType String e.g. USER_JOINED, FILE_CREATED, ROLE_CHANGED
targetId ObjectId Optional target entity
metadata Mixed Additional context

πŸ”„ Workflows

1. Creating a New Workspace

User clicks "Create Workspace" on Dashboard
        β”‚
        β–Ό
β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚  CreateWorkspaceModal    β”‚
β”‚  - Enter workspace name  β”‚
β”‚  - Select language        β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
            β”‚ POST /api/workspaces
            β–Ό
β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚  Server creates:             β”‚
β”‚  1. Workspace document       β”‚
β”‚  2. WorkspaceMember (owner)  β”‚
β”‚  3. Starter file (template)  β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
            β”‚
            β–Ό
  Redirect to /workspace/:id
  (Monaco Editor opens with starter file)

2. Inviting a Collaborator

Owner clicks "Share" β†’ ShareWorkspaceModal
        β”‚
        β”œβ”€β”€β”€ Option A: Invite by Email
        β”‚    β”‚  POST /api/workspaces/:id/invite
        β”‚    β”‚  { email, role: 'editor' | 'viewer' }
        β”‚    β–Ό
        β”‚    Server adds WorkspaceMember + emits member_joined
        β”‚
        └─── Option B: Share Room ID
             β”‚  Invitee uses JoinWorkspaceModal
             β”‚  POST /api/workspaces/:id/join
             β–Ό
             Server adds WorkspaceMember (editor) + emits member_joined

3. Real-Time Editing Session

1. Navigate to /workspace/:id
2. Socket connects β†’ join_workspace event
3. Server broadcasts user_joined to all
4. User clicks a file β†’ join_file event
5. User types β†’ code_change events
6. Server broadcasts code_update to others viewing same file
7. Server debounces (5s) and saves to MongoDB
8. Cursor movements broadcast via cursor_position β†’ cursor_update
9. On disconnect β†’ user_left broadcast + active user cleanup

4. Version History

Editor clicks "Save Version" icon
        β”‚  POST /api/files/:fileId/version
        β–Ό
  FileVersion snapshot created (content + editedBy + timestamp)
        β”‚
        β–Ό
  VersionHistory panel shows all snapshots for this file
        β”‚
        β–Ό
  User clicks "Restore" on a past version
        β”‚  POST /api/files/restore/:versionId
        β–Ό
  File.content overwritten with snapshot content
  (Socket will pick up and sync to all clients)

5. Ownership Transfer

Owner opens MembersPanel β†’ clicks "Transfer Ownership"
        β”‚  POST /api/workspaces/:id/transfer
        β”‚  { targetUserId }
        β–Ό
  β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
  β”‚ 1. Current owner β†’ demoted to editor  β”‚
  β”‚ 2. Target user β†’ promoted to owner    β”‚
  β”‚ 3. Workspace.owner ref updated        β”‚
  β”‚ 4. Activity logged                    β”‚
  β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

πŸš€ Quick Start Guide

Prerequisites

  • Node.js v16+ (v18+ recommended)
  • MongoDB instance (local or MongoDB Atlas)
  • npm v8+

1. Clone the Repository

git clone https://github.com/your-username/CodeSync.git
cd CodeSync

2. Setup Backend

cd backend
npm install

Create a .env file (use .env.example as reference):

PORT=3001
MONGO_URI=your_mongodb_connection_string
JWT_SECRET=your_jwt_secret_key
FRONTEND_URL=http://localhost:5173

Start the backend:

npm run dev    # Development (with nodemon)
npm start      # Production

3. Setup Frontend

cd frontend
npm install

Create a .env.development file:

VITE_BACKEND_URL=http://localhost:3001

Start the frontend:

npm run dev

4. Open the App

Navigate to http://localhost:5173 in your browser.


πŸ” Environment Variables

Backend (.env)

Variable Description Example
PORT Server port 3001
MONGO_URI MongoDB connection string mongodb+srv://...
JWT_SECRET Secret key for JWT signing your-secret-key
FRONTEND_URL Frontend origin for CORS http://localhost:5173

Frontend (.env.development)

Variable Description Example
VITE_BACKEND_URL Backend API base URL http://localhost:3001

πŸ“ˆ Performance Metrics

Metric Value How
Auth page initial focus ~0ms Instant render, no blocking
Workspace navigation (prefetched) < 150ms Route-based lazy loading + hover prefetch
Database query latency reduction ~40% .lean() on all read queries
Real-time message latency < 50ms Throttled Socket.IO broadcasting
API response size reduction ~60% Gzip compression middleware
Auto-save debounce interval 5 seconds Prevents excessive MongoDB writes

🀝 Contributing

  1. Fork the repository
  2. Create your feature branch (git checkout -b feature/amazing-feature)
  3. Commit your changes (git commit -m 'Add amazing feature')
  4. Push to the branch (git push origin feature/amazing-feature)
  5. Open a Pull Request

πŸ“„ License

This project is licensed under the MIT License β€” see the LICENSE file for details.


Built with ❀️ by the CodeSync team

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CodeSync - Pro Real-time Collaborative IDE

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