A collection of npm common commands for nodejs

Node.js can be used as a backend framework as it offers features such as high performance, scalability, cross-platform support, rich ecosystem, and ease of development.

To connect to a MySQL database, you need to follow these steps: Install the mysql2 driver. Use mysql2.createConnection() to create a connection object that contains the host address, port, username, password, and database name. Use connection.query() to perform queries. Finally use connection.end() to end the connection.

The following global variables exist in Node.js: Global object: global Core module: process, console, require Runtime environment variables: __dirname, __filename, __line, __column Constants: undefined, null, NaN, Infinity, -Infinity

There are two npm-related files in the Node.js installation directory: npm and npm.cmd. The differences are as follows: different extensions: npm is an executable file, and npm.cmd is a command window shortcut. Windows users: npm.cmd can be used from the command prompt, npm can only be run from the command line. Compatibility: npm.cmd is specific to Windows systems, npm is available cross-platform. Usage recommendations: Windows users use npm.cmd, other operating systems use npm.

The main differences between Node.js and Java are design and features: Event-driven vs. thread-driven: Node.js is event-driven and Java is thread-driven. Single-threaded vs. multi-threaded: Node.js uses a single-threaded event loop, and Java uses a multi-threaded architecture. Runtime environment: Node.js runs on the V8 JavaScript engine, while Java runs on the JVM. Syntax: Node.js uses JavaScript syntax, while Java uses Java syntax. Purpose: Node.js is suitable for I/O-intensive tasks, while Java is suitable for large enterprise applications.

Yes, Node.js is a backend development language. It is used for back-end development, including handling server-side business logic, managing database connections, and providing APIs.

Node.js and Java each have their pros and cons in web development, and the choice depends on project requirements. Node.js excels in real-time applications, rapid development, and microservices architecture, while Java excels in enterprise-grade support, performance, and security.

Server deployment steps for a Node.js project: Prepare the deployment environment: obtain server access, install Node.js, set up a Git repository. Build the application: Use npm run build to generate deployable code and dependencies. Upload code to the server: via Git or File Transfer Protocol. Install dependencies: SSH into the server and use npm install to install application dependencies. Start the application: Use a command such as node index.js to start the application, or use a process manager such as pm2. Configure a reverse proxy (optional): Use a reverse proxy such as Nginx or Apache to route traffic to your application