# youthlink-tech/fashion-commerce-backend architecture

> Architecture diagram of the GitHub repository youthlink-tech/fashion-commerce-backend, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-06-28). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/youthlink-tech/fashion-commerce-backend
- Repository: https://github.com/youthlink-tech/fashion-commerce-backend

## Overview

1. **Overall shape**
   - This is a Node.js backend built on Express.js for a fashion e-commerce platform.
   - The codebase is organized as a feature-oriented API server, not a monolith of unrelated modules: each domain has its own route, controller, service, model, and Zod schema files.

2. **Request pipeline**
   - Incoming HTTP requests enter through `index.js`, which wires the Express app, global middleware, MongoDB connection, and route mounting.
   - The normal flow is: route → middleware → controller → schema validation → service → model → MongoDB, then a JSON response back to the client.

3. **API layer and domain routing**
   - `routes/` contains one route module per business area: products, orders, customers, inventory, analytics, marketing, notifications, shipment handling, etc.
   - These routes are the main public boundary of the system and are likely consumed by both the storefront frontend and an internal dashboard.

4. **Controller layer**
   - `controllers/` holds the HTTP orchestration logic: parsing requests, invoking validation, calling services, and shaping responses.
   - The controller set shows the main product domains of the system: commerce operations, content/CMS-like settings, customer support, analytics, and omnichannel marketing.

5. **Business logic layer**
   - `services/` contains the core business rules and multi-step operations.
   - This layer is where workflows such as order handling, inventory updates, notification creation, marketing stats aggregation, access checks, and cache-aware reads are coordinated before touching the database.

6. **Database access and persistence**
   - `models/` encapsulates MongoDB collections and data access logic for each domain.
   - `config/db.js` and `config/collections.js` centralize database connectivity and collection naming, so the rest of the app works through consistent model wrappers rather than raw collection lookups scattered across the codebase.

7. **Validation and typed boundaries**
   - `schemas/` contains Zod schemas for request validation and data-shape enforcement.
   - This is an important architectural boundary: controllers and services can assume validated input before business logic runs, reducing coupling and runtime errors.

8. **Security and access control**
   - Authentication and authorization are handled through middleware in `middlewares/auth.js`, backed by JWT utilities in `utils/auth/`.
   - The repository explicitly supports role-based dashboard access with `owner`, `editor`, and `viewer` permissions, which suggests separate trust levels for admin-facing routes versus storefront-facing routes.

9. **Operational middleware**
   - Cross-cutting concerns live in `middlewares/`: CORS handling, rate limiting, centralized error handling, and user-context enrichment.
   - These middleware pieces define the runtime boundary around the API and protect it from abuse, bad origins, and inconsistent error responses.

10. **Commerce and inventory subsystem**
   - The most substantial functional area is the commerce backend: products, categories, colors, tags, seasons, promos, special offers, vendors, purchase orders, transfer orders, shipping zones, shipment handling, payment methods, and inventory.
   - This suggests the backend manages not only customer orders but also internal stock movement, procurement, and shipping configuration.

11. **Customer engagement and content management**
   - There is a parallel subsystem for storefront content and engagement: hero banners, top header content, logos, story pages, FAQ, policies, newsletters, login/register images, and marketing banners.
   - These modules indicate the backend also functions as a lightweight CMS for the public site and customer communications.

12. **Notifications, email, and customer support**
   - `utils/email/` and related controllers/services support transactional email flows such as order confirmation, shipping updates, refunds, password reset, invitations, and abandoned-cart messaging.
   - `customerSupport`, `notification`, and email option builders form a side-effect layer that reacts to commerce events and user actions.

13. **Analytics and omnichannel sync**
   - `analytics`, `dashboard`, `audit`, and `omnichannel` are a separate operational subsystem.
   - The `lib/meta*` files and `crons/metaInsightsCron.js`/`marketingStatsCron.js` show scheduled synchronization with Meta advertising and insights data, while `utils/googleAnalytics/` indicates Google Analytics integration.
   - `services/cacheHelper.js` and `config/redis.js` suggest caching is used for performance or coordination in these reporting/sync flows.

14. **Background jobs and automation**
   - `crons/` contains scheduled jobs for abandoned carts, abandoned checkout sessions, audit logs, marketing stats, and Meta insights.
   - These jobs run outside the request/response path and periodically update MongoDB-backed analytics or trigger customer re-engagement workflows.

15. **Media and external integrations**
   - File/media handling appears to go through upload-specific controllers and helpers, with Cloudinary-related config and utilities present in the tree.
   - The architecture therefore includes an external media storage boundary separate from the primary MongoDB data store.

16. **Shared utilities and bootstrapping**
   - `utils/` contains reusable domain helpers for dates, ordering calculations, promo validation, device/user info, customer/order ID generation, and activity/change tracking.
   - `scripts/seedOmnichannelData.js` provides bootstrap data for the omnichannel subsystem, which is useful for local setup or environment seeding.

Main entry points: [`controllers/analyticsController.js`](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/analyticsController.js) (Ops API), [`index.js`](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/index.js) (index.js), [`crons/index.js`](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/crons/index.js) (Cron jobs), [`controllers/productsController.js`](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/productsController.js) (Catalog API)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_core["Core API"]
  node_index_js["index.js<br/>entrypoint<br/>[index.js]"]
  node_routes_layer["Routes<br/>api boundary"]
  node_middlewares_layer["Middleware<br/>cross-cutting"]
  node_schemas_layer["Schemas<br/>validation"]
  node_services_layer["Services<br/>business logic"]
  node_models_layer[("Models<br/>persistence")]
end

subgraph group_commerce["Commerce"]
  node_product_controller["Catalog API<br/>controller"]
  node_order_controller["Order API<br/>controller<br/>[orderController.js]"]
  node_inventory_controller["Inventory API<br/>controller"]
end

subgraph group_content["Content"]
  node_content_controller["Content API<br/>controller"]
end

subgraph group_engagement["Engagement"]
  node_engagement_controller["Engagement API<br/>controller"]
  node_support_controller["Support API<br/>controller"]
  node_email_utils["Email pipeline<br/>notification helper"]
end

subgraph group_ops["Ops & Analytics"]
  node_ops_controller["Ops API<br/>controller"]
  node_analytics_client{{"Analytics client<br/>external client<br/>[analyticsClient.js]"}}
  node_meta_sync{{"Meta sync<br/>external sync"}}
  node_crons_index["Cron jobs<br/>scheduler<br/>[index.js]"]
end

subgraph group_shared["Shared Infra"]
  node_config_db[("Mongo config<br/>database config<br/>[db.js]")]
  node_config_redis[("Redis config<br/>cache config<br/>[redis.js]")]
  node_auth_utils{{"Auth utils<br/>jwt/rbac<br/>[authUtils.js]"}}
  node_media_utils{{"Media utils<br/>upload helper<br/>[cloudinary.js]"}}
  node_cloudinary_config[("Cloudinary config<br/>media config<br/>[cloudinary.js]")]
end

node_index_js -->|"mounts"| node_routes_layer
node_index_js -->|"installs"| node_middlewares_layer
node_index_js -->|"connects"| node_config_db
node_index_js -->|"starts"| node_crons_index
node_routes_layer -->|"catalog"| node_product_controller
node_routes_layer -->|"orders"| node_order_controller
node_routes_layer -->|"inventory"| node_inventory_controller
node_routes_layer -->|"content"| node_content_controller
node_routes_layer -->|"engagement"| node_engagement_controller
node_routes_layer -->|"support"| node_support_controller
node_routes_layer -->|"ops"| node_ops_controller
node_product_controller -->|"validates"| node_schemas_layer
node_order_controller -->|"validates"| node_schemas_layer
node_inventory_controller -->|"validates"| node_schemas_layer
node_content_controller -->|"validates"| node_schemas_layer
node_engagement_controller -->|"validates"| node_schemas_layer
node_support_controller -->|"validates"| node_schemas_layer
node_ops_controller -->|"validates"| node_schemas_layer
node_product_controller -->|"delegates"| node_services_layer
node_order_controller -->|"delegates"| node_services_layer
node_inventory_controller -->|"delegates"| node_services_layer
node_content_controller -->|"delegates"| node_services_layer
node_engagement_controller -->|"delegates"| node_services_layer
node_support_controller -->|"delegates"| node_services_layer
node_ops_controller -->|"delegates"| node_services_layer
node_services_layer -->|"persists"| node_models_layer
node_services_layer -->|"checks access"| node_auth_utils
node_services_layer -->|"caches"| node_config_redis
node_services_layer -->|"sends mail"| node_email_utils
node_services_layer -->|"uploads media"| node_media_utils
node_media_utils -->|"uses"| node_cloudinary_config
node_ops_controller -->|"reports"| node_analytics_client
node_ops_controller -->|"syncs"| node_meta_sync
node_crons_index -->|"runs"| node_meta_sync
node_crons_index -->|"collects"| node_analytics_client
node_crons_index -->|"reuses"| node_services_layer

click node_index_js "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/index.js"
click node_product_controller "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/productsController.js"
click node_order_controller "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/orderController.js"
click node_inventory_controller "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/inventoryController.js"
click node_content_controller "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/heroBannerController.js"
click node_engagement_controller "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/notificationController.js"
click node_support_controller "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/customerSupportController.js"
click node_ops_controller "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/analyticsController.js"
click node_config_db "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/config/db.js"
click node_config_redis "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/config/redis.js"
click node_auth_utils "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/auth/authUtils.js"
click node_media_utils "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/media/cloudinary.js"
click node_email_utils "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/email/sendEmailToCustomer.js"
click node_analytics_client "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/googleAnalytics/analyticsClient.js"
click node_meta_sync "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/lib/metaInsightsSync.js"
click node_crons_index "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/crons/index.js"
click node_cloudinary_config "https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/config/cloudinary.js"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_index_js,node_routes_layer,node_middlewares_layer,node_schemas_layer,node_services_layer,node_models_layer toneBlue
class node_product_controller,node_order_controller,node_inventory_controller toneAmber
class node_content_controller toneMint
class node_engagement_controller,node_support_controller,node_email_utils toneRose
class node_ops_controller,node_analytics_client,node_meta_sync,node_crons_index toneIndigo
class node_config_db,node_config_redis,node_auth_utils,node_media_utils,node_cloudinary_config toneTeal
```

## Components

### Core API

HTTP entrypoint, routing, middleware, validation, and persistence pipeline.

- [index.js](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/index.js): entrypoint · Bootstraps Express, middleware, routes, and database connection. · `index.js`
- **Routes**: api boundary · Public HTTP boundary that splits the API into business domains.
- **Middleware**: cross-cutting · CORS, auth, rate limiting, user context, and error handling.
- **Schemas**: validation · Zod validation boundary for requests and domain shapes.
- **Services**: business logic · Domain workflows, coordination, and cache-aware reads.
- **Models**: persistence · MongoDB collection wrappers and query logic.

### Commerce

Catalog, orders, inventory, and procurement workflows.

- [Catalog API](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/productsController.js): controller · Product, category, color, tag, season, promo, and special-offer HTTP orchestration. · `controllers/productsController.js`
- [Order API](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/orderController.js): controller · Orders, inventory moves, purchase orders, transfers, shipments, and payment methods. · `controllers/orderController.js`
- [Inventory API](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/inventoryController.js): controller · Stock and warehouse-facing inventory operations. · `controllers/inventoryController.js`

### Content

Storefront content and CMS-like settings.

- [Content API](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/heroBannerController.js): controller · Hero banners, headers, logos, stories, FAQ, and policy content. · `controllers/heroBannerController.js`

### Engagement

Notifications, email, and customer support flows.

- [Engagement API](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/notificationController.js): controller · Newsletter, notifications, email requests, and marketing campaigns. · `controllers/notificationController.js`
- [Support API](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/customerSupportController.js): controller · Customer support and operational requests. · `controllers/customerSupportController.js`
- [Email pipeline](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/email/sendEmailToCustomer.js): notification helper · Transactional email builders and delivery utilities. · `utils/email/sendEmailToCustomer.js`

### Ops & Analytics

Dashboards, analytics, omnichannel sync, and scheduled jobs.

- [Ops API](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/controllers/analyticsController.js): controller · Analytics, dashboard, audit, and omnichannel coordination. · `controllers/analyticsController.js`
- [Analytics client](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/googleAnalytics/analyticsClient.js): external client · Google Analytics integration used by reporting flows. · `utils/googleAnalytics/analyticsClient.js`
- [Meta sync](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/lib/metaInsightsSync.js): external sync · Meta ads and insights synchronization logic. · `lib/metaInsightsSync.js`
- [Cron jobs](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/crons/index.js): scheduler · Background jobs for abandoned carts, audit logs, marketing stats, and Meta insights. · `crons/index.js`

### Shared Infra

Cross-cutting config, auth, media, cache, and helper utilities.

- [Mongo config](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/config/db.js): database config · MongoDB connection setup. · `config/db.js`
- [Redis config](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/config/redis.js): cache config · Cache and coordination layer for performance-sensitive flows. · `config/redis.js`
- [Auth utils](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/auth/authUtils.js): jwt/rbac · JWT helpers and role-based access checks. · `utils/auth/authUtils.js`
- [Media utils](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/utils/media/cloudinary.js): upload helper · Cloudinary upload and media handling helpers. · `utils/media/cloudinary.js`
- [Cloudinary config](https://github.com/youthlink-tech/fashion-commerce-backend/blob/main/config/cloudinary.js): media config · External media storage configuration. · `config/cloudinary.js`

## Connections

- index.js → Routes: mounts · Registers the HTTP route surface.
- index.js → Middleware: installs · Applies global request handling and protections.
- index.js → Mongo config: connects · Initializes MongoDB before serving traffic.
- index.js → Cron jobs: starts · Enables background automation.
- Routes → Catalog API: catalog · Public catalog and merchandising endpoints.
- Routes → Order API: orders · Order, shipment, and procurement endpoints.
- Routes → Inventory API: inventory · Inventory and stock endpoints.
- Routes → Content API: content · Storefront content and CMS endpoints.
- Routes → Engagement API: engagement · Notifications and marketing endpoints.
- Routes → Support API: support · Customer support endpoints.
- Routes → Ops API: ops · Analytics, dashboard, and audit endpoints.
- Catalog API → Schemas: validates · Validates product-domain requests and payloads.
- Order API → Schemas: validates · Validates order and fulfillment inputs.
- Inventory API → Schemas: validates · Validates inventory operations.
- Content API → Schemas: validates · Validates CMS-style content updates.
- Engagement API → Schemas: validates · Validates notification and marketing inputs.
- Support API → Schemas: validates · Validates support requests.
- Ops API → Schemas: validates · Validates analytics and admin inputs.
- Catalog API → Services: delegates · Hands off business rules to services.
- Order API → Services: delegates · Coordinates multi-step commerce workflows.
- Inventory API → Services: delegates · Coordinates stock movement and inventory rules.
- Content API → Services: delegates · Coordinates content read/write operations.
- Engagement API → Services: delegates · Coordinates notifications and campaigns.
- Support API → Services: delegates · Coordinates support workflows.
- Ops API → Services: delegates · Coordinates reporting and dashboard workflows.
- Services → Models: persists · Reads and writes MongoDB-backed domain data.
- Services → Auth utils: checks access · Applies role-based permissions where needed.
- Services → Redis config: caches · Uses Redis for cache-aware or coordinated reads.
- Services → Email pipeline: sends mail · Triggers transactional and campaign emails.
- Services → Media utils: uploads media · Handles external media storage interactions.
- Media utils → Cloudinary config: uses · Binds upload helpers to Cloudinary settings.
- Ops API → Analytics client: reports · Feeds Google Analytics-style reporting flows.
- Ops API → Meta sync: syncs · Coordinates Meta sync and insights pipelines.
- Cron jobs → Meta sync: runs · Schedules Meta sync jobs.
- Cron jobs → Analytics client: collects · Schedules analytics collection and aggregation jobs.
- Cron jobs → Services: reuses · Invokes domain services for background workflows.