Express REST API implementing user signup, duplicate validation, and user retrieval with documented Postman/curl tests.

A simple REST API built with Node.js and Express. It supports user signup, fetching users by ID, and a demo protected route.

• Node.js
• Express
• CORS
• In-memory storage (no database yet)

1. Install dependencies: npm install

2. Start server: node server.js

Server runs on: http://localhost:8000

POST /signup

Creates a new user account.

Request Body (JSON): { "username": "triphon", "email": "[email protected]", "password": "1234" }

Success Response: 201 Created { "message": "User triphon registered successfully", "data": { "id": 1, "username": "triphon", "email": "[email protected]" } }

Errors:

• 400 Missing fields
• 409 Email already registered

GET /users/:id

Example: GET http://localhost:8000/users/1

Response: { "id": 1, "username": "triphon", "email": "[email protected]", "createdAt": "2026-02-24T10:00:00.000Z" }

Errors:

• 400 Invalid ID
• 404 User not found

GET /secret?user=triphon

Returns a message only if username matches "triphon".

• Method: POST
• URL: http://localhost:8000/signup
• Headers: Content-Type: application/json
• Body: raw JSON

curl -X POST http://localhost:8000/signup
-H "Content-Type: application/json"
-d "{"username":"triphon","email":"[email protected]","password":"1234"}"

• Users stored in memory (reset on server restart)
• No real password hashing yet
• No database persistence

Future: MongoDB / SQL integration