Banking API

This repository is a simple Node.js/Express application that provides a RESTful API for basic banking user flows. It includes user registration and login endpoints, MongoDB persistence with mongoose, request logging middleware, and remote log shipping to SolarWinds Observability.

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🗂️ Project Structure

index.js                        # Application entry point
config/
  db.js                         # MongoDB connection helper
  solarwinds.js                 # SolarWinds Observability log shipper
controllers/
  auth.controller.js            # Route handlers for user registration and login
models/
  user.model.js                 # Mongoose schema for users
middleware/
  logger.middleware.js          # Request logging middleware (ships logs to SolarWinds)
routes/
  auth.routes.js                # Express router for user endpoints

• index.js: bootstraps the server, loads environment variables via dotenv, applies middleware (CORS, JSON body parsing, and request logging), and registers the /users router.
• config/db.js: connects to MongoDB using the MONGO_URI env variable.
• config/solarwinds.js: exports sendToSolarWinds() — ships structured log entries to SolarWinds Observability via axios using the SOLARWINDS_TOKEN env variable.
• models/user.model.js: defines User fields — fullName, email, password, accountNumber — with timestamps.
• controllers/auth.controller.js: contains registerUser and loginUser handlers.
• routes/auth.routes.js: wires auth controller functions to POST /register and POST /login.
• middleware/logger.middleware.js: on every completed response, records method, URL, status code, and duration, then forwards the structured payload to sendToSolarWinds.

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🚀 Getting Started

1. Install dependencies:

   pnpm install

2. Create a .env file in the root:

   PORT=3000
   MONGO_URI=mongodb://localhost:27017/mydb
   SOLARWINDS_TOKEN=your_solarwinds_ingestion_token

   SOLARWINDS_TOKEN is optional. If omitted, logs are silently skipped and only printed to the console.

3. Run the server:

   pnpm dev      # development (nodemon)
   pnpm start    # production

4. The API will be available at http://localhost:3000.

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📡 API Endpoints

Method	Path	Description
GET	/	Health check — returns welcome text
POST	/users/register	Register a new banking user
POST	/users/login	Login a user

Request & Response Examples

POST /users/register

Request body:

{
  "fullName": "John Doe",
  "email": "john@example.com",
  "password": "123456",
  "accountNumber": 11223344
}

Response 201:

{
  "message": "User registered successfully",
  "data": {
    "id": "...",
    "fullName": "John Doe",
    "email": "john@example.com",
    "accountNumber": 11223344,
    "createdAt": "..."
  }
}

POST /users/login

Request body:

{
  "email": "john@example.com",
  "password": "123456"
}

Response 200:

{
  "message": "Login successful",
  "data": {
    "id": "...",
    "fullName": "John Doe",
    "email": "john@example.com",
    "accountNumber": 11223344
  }
}

Response 401:

{ "message": "Invalid email or password" }

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🛠️ Technologies Used

Package	Purpose
Express.js	HTTP server & routing
Mongoose	MongoDB ODM
dotenv	Environment variable loading
axios	HTTP client for SolarWinds log shipping
cors	Cross-Origin Resource Sharing middleware
nodemon	Auto-restart during development

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📊 Logging & Observability

Every completed HTTP request is captured by logger.middleware.js and sent as a structured JSON payload to SolarWinds Observability:

{
  "timestamp": "2026-03-03T06:51:04.381Z",
  "method": "POST",
  "url": "/users/login",
  "statusCode": 200,
  "durationMs": 46,
  "message": "2026-03-03T06:51:04.381Z | POST /users/login | 200 | 46ms"
}

Set SOLARWINDS_TOKEN in .env to enable shipping. If the token is absent, logs are skipped silently.

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✅ Additional Notes

• Login is intentionally implemented without security (no password hashing, tokens, or session management), based on the lab objective.
• Feel free to extend the codebase with password hashing (bcrypt), JWT/session based auth, and role-based authorization.