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Code Snippets

Small, reusable JavaScript snippets for common conversions, browser APIs, closures, typed arrays, UUIDs, and file handling.

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All Code Snippets Guides

Deep dives, examples, and production tips

6 guides

Code Snippets2025-07-10

JavaScript Closure Inside Loops

Learn how JavaScript closures behave inside loops, why var causes repeated values, and how let, helper functions, and iteration methods solve the problem.

Code Snippets2025-09-10

File Uploads in JavaScript: Guide to the Fetch API

A complete guide to uploading files in JavaScript using the Fetch API and FormData. Learn best practices, see a full code example with progress bar, and understand error handling.

Code Snippets2025-07-14

JavaScript Typed Arrays: Uint8Array, Uint16Array, and Uint32Array

Learn about JavaScript Uint8Array, Uint16Array, and Uint32Array, their use cases in handling binary data efficiently, and why understanding them is relevant for website performance optimization.

Code Snippets2025-07-08

Convert a String to Boolean in JavaScript

Learn how to convert a string like true or false into a boolean in JavaScript. Explore best practices, pitfalls, and multiple methods to handle string-to-boolean conversion safely.

Code Snippets2025-07-07

How to Generate a UUID / GUID in JavaScript & Node.js (Native)

Generate cryptographically secure UUID v4 / GUID in JavaScript using crypto.randomUUID(). Works natively in modern browsers and Node.js without npm packages.

Code Snippets2024-10-23

String to Uint8Array & Uint8Array to String in JavaScript (Fast)

Convert strings to Uint8Array and back using TextEncoder, TextDecoder, and Buffer. Handles UTF-8 Unicode characters safely with benchmarked examples.