Alex Chen

Front-end & Node.js Developer

JavaScriptTypeScriptNode.jsBrowser APIs

About

Alex is a front-end and Node.js developer with extensive experience building web applications and developer tooling. He is passionate about web standards, browser APIs, and the JavaScript ecosystem. In his spare time he contributes to open-source projects and writes about modern JavaScript patterns, performance optimisation, and everything related to the web platform.

Articles by Alex Chen

JSON Formatter JavaScript — JSON.stringify()JavaScript

Format JSON in JavaScript with JSON.stringify(data, null, 2). Covers replacer, BigInt, Date, Node.js files, CLI, and fast-json-stringify.

JSON Formatter·2026-03-10

Base64 Decode JavaScript — atob() & BufferJavaScript

Decode Base64 in JavaScript using atob() and Buffer.from(). Covers UTF-8 handling, URL-safe Base64, JWT decoding, Node.js files, and four common mistakes.

Base64 Decode·2026-03-11

URL Encode JavaScript — encodeURIComponent()JavaScript

Encode URLs in JavaScript with encodeURIComponent(), URLSearchParams, and encodeURI(). Covers Fetch API, qs library, CLI, and common mistakes. Node.js 10+.

URL Encode·2026-03-11

URL Decode JavaScript — decodeURIComponent()JavaScript

Decode percent-encoded strings in JavaScript using decodeURIComponent(). Covers URLSearchParams, decodeURI(), Fetch API, error handling, and Node.js 10+.

URL Decode·2026-03-11

Base64 Encode JavaScript — btoa() & BufferJavaScript

Encode to Base64 in JavaScript using btoa() and Buffer.from(). Covers Unicode handling, URL-safe Base64, file and API encoding. Node.js 18+ examples.

Base64 Encode·2026-03-11