JavaScript

 The best reference for JavaScript coding is universally considered the MDN Web Docs (Mozilla Developer Network).

Why MDN?

• It provides the most comprehensive, accurate, and up-to-date documentation for the JavaScript language, including core features, built-in objects, methods, properties, expressions, operators, and more.

• It's maintained by Mozilla and the community, with frequent updates (as recent as late 2025 in available sources).

• It's environment-agnostic but excels in web contexts, covering standards like ECMAScript.

• Developers and experts consistently recommend it as the definitive source—superior in depth and reliability to alternatives.

Key sections to bookmark:

• Main JavaScript page: https://developer.mozilla.org/en-US/docs/Web/JavaScript

• Detailed Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference (covers global objects, functions, classes, etc.)

• Guide for learning/explanations: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide

Other Strong Options

If MDN doesn't fit your style:

• javascript.info (The Modern JavaScript Tutorial) — Excellent for in-depth explanations with examples; regularly updated (last in December 2025).

• W3Schools JavaScript Reference — Quick and simple lookups with try-it-yourself editors, though less detailed than MDN.

For quick coding reference (looking up syntax, methods, or behaviors while writing code), start with MDN—it's what most professional developers use daily. If you're learning from scratch, pair it with tutorials from the same site or javascript.info.