Mattermost Project Structure
The secure collaboration platform for technical teams. A high-performance Go server combined with a rich React/Redux frontend.
Updated 2025-12-30
Project Directory
mattermost/
server/
Go Backend Server
channels/
Core messaging logic
app/
Business logic layer
api4/
REST API v4
store/
Database interface
model/
Data structures
cmd/
Entry points
mattermost/
Server binary
mmctl/
CLI tool
enterprise/
Commercial features
go.mod
Go dependencies
webapp/
React Frontend
channels/
Main web application
src/
platform/
Shared components & logic
client/
API Client
components/
UI Library
package.json
JS dependencies
e2e-tests/
Cypress & Playwright tests
Makefile
Build automation
docker-compose.yml
Dev environment
Repository Info
- Repository-mattermost/mattermost
- Stars-30k+
- License-AGPL-3.0 / Commercial
- Last Analyzed-December 2025
Tech Stack
- Backend-Go 1.22+
- Frontend-React + Redux
- Database-PostgreSQL / MySQL
- Build Tool-Make / Webpack
- Realtime-WebSocket
Architecture Notes
Mattermost uses a layered architecture in Go. The api4 layer handles HTTP requests, the app layer contains business logic, and the store layer handles database access. This separation makes the codebase highly testable and maintainable. The frontend is a React SPA that heavily relies on Redux for state management, which is crucial for a real-time messaging app.
Key Directories
- server/channels/app/-The 'Service Layer'. This is where the core business rules live (e.g., 'PostMessage', 'CreateChannel'). It is independent of the HTTP API.
- server/channels/store/-The 'Repository Layer'. Abstracts the database interactions, allowing Mattermost to support both PostgreSQL and MySQL.
- webapp/channels/src/-The main React application. It consumes the API and manages the WebSocket connection for real-time updates.
Why This Structure?
Mattermost is the gold standard for Go web applications. Its structure is clean, idiomatic, and scales well. It also demonstrates how to manage an 'Open Core' business model where Enterprise features sit alongside the open-source code.
Share this template