Project Name

User Authentication API

Description

This project implements a User Authentication API using Node.js, Express.js, and SQLite. The API provides endpoints for user registration, login, and password change. User information is stored in a SQLite database, and passwords are hashed using bcrypt for security.

Installation

1. Clone the repository: [git clone https://github.com/username/repository.git](https://github.com/dev-ajithkumar/express-auth-api.git)
2. Navigate to the project directory: cd repository
3. Install the dependencies: npm install

Database Setup

1. Open the userData.db file using an SQLite database management tool.
2. Run the following SQL query to create the user table:

CREATE TABLE IF NOT EXISTS user (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    username TEXT UNIQUE NOT NULL,
    name TEXT NOT NULL,
    password TEXT NOT NULL,
    gender TEXT NOT NULL,
    location TEXT NOT NULL
);

Usage

1. Start the server: npm start
2. Use an API testing tool (e.g., Postman) to send requests to the following endpoints:

GET /register

• Description: Fetches all users from the database.
• Response: Array of user objects.

POST /register

• Description: Registers a new user.
• Request Body: JSON object with the following properties:
  • username: User's username (string, required).
  • name: User's name (string, required).
  • password: User's password (string, required).
  • gender: User's gender (string, required).
  • location: User's location (string, required).
• Response:
  • Success: "User created successfully".
  • Error (User already exists): "User already exists".
  • Error (Password too short): "Password is too short".

POST /login

• Description: Authenticates a user.
• Request Body: JSON object with the following properties:
  • username: User's username (string, required).
  • password: User's password (string, required).
• Response:
  • Success: "Login success!".
  • Error (Invalid user): "Invalid user".
  • Error (Invalid password): "Invalid password".

PUT /change-password

• Description: Changes the password for a user.
• Request Body: JSON object with the following properties:
  • username: User's username (string, required).
  • oldPassword: User's current password (string, required).
  • newPassword: User's new password (string, required).
• Response:
  • Success: "Password updated".
  • Error (Invalid current password): "Invalid current password".
  • Error (New password too short): "Password is too short".

Dependencies

• express: Web framework for Node.js
• sqlite: SQLite database driver for Node.js
• sqlite3: SQLite library for Node.js
• bcrypt: Library for password hashing
• path: Module for file path manipulation