A User Management Program

Prerequisites

• mongoose
• MongoDB
• Express
• JWT
• bcrypt
• CORS

mongoose

Mongoose provides these functions：

• Connect with MongoDB and monitor the connection status.
• Create the Schema & Model of MongoDB collection.
• Provide related functions for CRUD operations

MongoDB

MongoDB is an open-source document database that uses a flexible schema for storing data. We use it to perform CRUD operations with mongoose in Node.js applications.

Express

Express is mainly responsible for：

• Handle with web requests and responses.
• Handle with Web APIs Routing.
• Execute various middleware functions.

JWT

The 「package：jsonwebtoken」 is mainly responsible for：

• Generate a JWT

  • Use the sign() method to generate a JWT.

• Verify a JWT

  • Use the verify() method to complete Token verification and return the decoded Payload.

bcrypt

The 「package：bcrypt」 is mainly responsible for：

• Encrypt the user password

  • Use the hash() method to encrypt the user password.

• Check the user password

  • Use the compare() method to check if the password entered by the user is the same as the password stored in MongoDB.

CORS

CORS provides a Express middleware that can be used to enable CORS with various options for cross domain web applications.