🔐 Simple Auth API

Node.js • Express • Postman 🧪

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🔐 Simple Authentication API

A lightweight authentication API built using Node.js and Express, featuring 📝 Signup and 🔑 Signin endpoints. This project of mine demonstrates API handling, request/response validation, and ⚡ in-memory user storage. All endpoints are tested using Postman 🧪, making it ideal for interviews or beginners learning backend basics.

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🚀 Features

• 📝 User Signup
• 🔑 User Signin
• 🧠 In-memory user storage (no database)
• 📮 Proper request/response handling
• 🧪 Postman tested
• ❗ Basic validation included

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🛠️ Tech Stack

• Node.js
• Express.js
• Postman (for API testing)

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📦 Installation & Setup

# Clone the repo
git clone https://github.com/your-username/your-repo.git

# Navigate into the project
cd your-repo

# Install dependencies
npm install

# Start the server
node index.js

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📡 API Endpoints

📝 POST /signup

Create a new user.

Request Body

{
  "username": "yourname",
  "password": "yourpassword"
}

Responses

• 201 – User created successfully
• 400 – Username already exists / invalid input

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🔑 POST /signin

Authenticate an existing user.

Request Body

{
  "username": "yourname",
  "password": "yourpassword"
}

Responses

• 200 – Signin successful
• 401 – Invalid username or password

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🧪 Testing with Postman

• Open Postman
• Create POST requests for /signup and /signin
• Send JSON request bodies
• Verify responses & status codes

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📬 Postman Collection

You can import the Postman collection that I made to test the API endpoints:

File: postman\Webhibe Assignment.postman_collection.json

It contains:

• POST /signup
• POST /signin

📄 License

This project is open-source under the BSD 2-Clause License.

🩵 Author

Krittika Biswas Made as an assignment for Webhibe