node.js Archives | Page 4 of 4 | JS FAQ - JavaScript Guides Online

How to use console.log and console.error in Node.js

Console methods like console.log, console.error, and console.trace improve debugging by providing detailed output and stack traces. Conditional logging reduces noise, asynchronous logging enhances performance, and structured logging offers richer context. Integrating with monitoring tools and managing log retention supports effective application monitoring.

Crypto and Utilities

How to hash a password securely in Node.js

Crypto and Utilitiesbcrypt, crypto, node.js, password

Secure password hashing in Node.js using bcrypt: implement algorithms like Argon2, PBKDF2, salting, iterations, and verification code for robust user authentication.

Crypto and Utilities

How to hash a string using SHA256 in Node.js

Crypto and Utilitiescrypto, hash, node.js, sha256

SHA256 is a cryptographic hash function that produces a 256-bit hash, crucial for data integrity in applications like SSL/TLS and blockchain. This article covers its implementation in Node.js, including hashing data and files, securing passwords with salts, and common pitfalls like encoding issues and object serialization errors.

Node.js Core

How to access command-line arguments in Node.js

Node.js Coreargs, cli, node.js, process.argv

A Node.js command-line argument parser script for handling various formats: key-value pairs, boolean flags, single-dash flags (-v), combined flags (-xvf), and --key=value assignments. This JavaScript function processes process.argv and positional arguments, showing why yargs or commander are better.

Node.js Core

How to export a single function from a Node.js module

Node.js Coreexports, function, module.exports, node.js

Single function exports in Node.js modules enhance code clarity and organization. Start with a single export for simplicity, then expand to multiple functions as needed. Avoid mixing export styles to prevent conflicts. Establish a consistent export approach for better collaboration and ease of use in your projects. Maintain clear boundaries in module design.

Node.js Core

How to create a module in Node.js

Node.js Coreexports, js modules, module, node.js

Navigating the balance between functions and objects in programming is crucial for maintainable code. Pure functions offer predictability and testability, while objects manage complex state effectively. Avoid 'ugly' patterns like global mutations or anemic domain models. Choosing the right approach enhances code architecture and discipline.

Node.js Core

How to run a JavaScript file with Node.js

Node.js Corenode.js, run, script, terminal

Node.js command-line arguments with process.argv. Access script inputs starting at index 2 or use slice(2). Parse flags with libraries like yargs or commander.