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JavaScript

The language of the Web, covering interactions, browser APIs and server applications.

29 Oct 2026Article

WebMCP: W3C backs a polyfill for experimenting with web agents

The W3C has launched a second pilot in its open-source program: a polyfill for WebMCP, an incubating JavaScript API that lets applications expose functions as tools callable by agents and assistive technologies. The polyfill is intended to support experimentation and interoperability as the specification evolves.

Plans include publishing an npm package, tracking Web Platform Tests coverage, and advancing lifecycle events and declarative support. If WebMCP moves onto the standards track and interoperable native implementations emerge, the polyfill would be phased out gradually.

WebMCP AI Agents JavaScript

Ian Jacobs, Strategy Team

29 Oct 2026Article

DeadTag turns abandoned website tags into iPhone attack paths

blog.report-uri.comPermalink

An illustration shows a dilapidated web code tag connected by digital streams to an iPhone struck by a red and blue distortion.

Expired domains behind old analytics and advertising tags have been bought and repurposed to redirect visitors to malicious content, including the Coruna and DarkSword iOS exploit kits. Report URI and iVerify describe a chain that filters visitors and tailors its payload to the device; security scanners may receive only an empty response.

The case shows how a forgotten third-party script remains an active dependency: its domain can change hands without any site change. The article recommends auditing tags, monitoring loaded scripts, and restricting their domains with a Content Security Policy.

Security Dependency management JavaScript

Scott Helme

26 Oct 2026Documentation

OGL: a minimal WebGL library for writing custom shaders

github.comPermalink

OGL keeps abstractions to a minimum for WebGL rendering and custom shaders. This dependency-free ES module library shares some conventions with Three.js, but provides fewer features and leaves room to use native WebGL commands directly.

Its Math, Core, and Extras split helps keep integrations modular; the README lists 29 KB minified and gzipped for the full set before tree-shaking. Commented examples cover both a camera-based scene and a fullscreen shader. The low abstraction level makes the code easier to learn and extend, while leaving more WebGL details to the developer.

WebGL JavaScript

23 Oct 2026Article

Mutative: immutable updates without the spread syntax

mutative.js.orgPermalink

Mutative lets developers write mutations against a draft to produce a new immutable state, avoiding manual spread copies at every level. It also supports arrays, Set and Map, along with patches and optional freezing.

Its benchmarks report a geometric mean 3.6 times faster than Immer with matched settings, or 6.6 times with each library’s defaults. Results vary by workload; hand-written reducers remain faster in most of the cases shown.

JavaScript State management

10 May 2026Documentation

Learn JavaScript and web performance patterns with Patterns.dev

patterns.devPermalink

Patterns.dev documents JavaScript design patterns and performance techniques for web apps. Its examples connect architectural choices to their impact on loading and rendering.

JavaScript Web Performance Software Architecture

1 May 2026Tool

Share atomic frontend state with Nanostores

github.comPermalink

Nanostores provides small composable state stores for React, Preact, Vue, and Svelte. Its atomic, tree-shakable design supports focused state without shipping unused code.

State management JavaScript

4 Mar 2026Tool

Add haptic feedback to mobile web interactions

haptics.lochie.mePermalink

WebHaptics adds tactile feedback to mobile web interactions through a small JavaScript API. It offers a way to make gestures feel physical without building a native app.

JavaScript UI/UX

@lochieaxon

6 Oct 2025Tool

Spacetime: explore dates, time zones and formatting

work.spencermountain.devPermalink

This demo shows converting an instant between time zones and formatting it with Spacetime. It also exposes calendar and daylight-saving information useful for time-based interfaces.

JavaScript

Spencer Kelly

5 Oct 2025Repository

Npm-check-updates: identify newer dependency versions

github.comPermalink

Npm-check-updates compares package.json dependencies with available versions and can update their constraints. Installation remains a separate step, allowing review of the proposed changes.

Dependency management JavaScript

5 Oct 2025Tool

Knip: find unused dependencies, exports and files

knip.devPermalink

Knip analyzes project entry points and tooling to detect unused code. Framework-aware plugins make dependency, export and file cleanup more targeted.

Dependency management JavaScript TypeScript

7 Sept 2025Repository

EmbedPDF: add a framework-independent PDF viewer

github.comPermalink

EmbedPDF provides a JavaScript PDF viewer that integrates with multiple frameworks. The repository distinguishes the stable branch from ongoing development and links to demos and documentation.

Document management JavaScript UI/UX

17 Aug 2025Tool

ForesightJS: anticipate navigation to trigger prefetching

foresightjs.comPermalink

ForesightJS observes cursor movement, keyboard navigation and scrolling to estimate the next target. It can start loading before a click or touch interaction.

Prefetching JavaScript Web Performance

4 May 2025Tool

PDFSlick: embed PDF navigation and tools in web applications

pdfslick.devPermalink

PDFSlick provides PDF viewer examples for React, Svelte, SolidJS and JavaScript. Navigation, thumbnails and zoom show how documents can become part of the application interface.

Document management UI/UX JavaScript React

20 Apr 2025Tool

Anime.js: coordinate timelines, gestures and scroll animation

animejs.comPermalink

Anime.js combines animation, timelines, springs and scroll observation in one API. Composition tools let developers tune properties and synchronize multiple effects.

Anime.js Animation JavaScript

23 Feb 2025Tool

SuperJSON: serialize dates and types missing from JSON

npmjs.comPermalink

SuperJSON extends JSON.stringify and JSON.parse to transport values such as Date and BigInt. It reduces manual conversions when exchanging data between server and client.

JavaScript TypeScript

22 Feb 2025Repository

ExcellentExport: export HTML tables to Excel or CSV

github.comPermalink

ExcellentExport turns HTML tables into Excel or CSV files directly in the browser. It adds exports to an interface without requiring a dedicated server service.

JavaScript HTML

15 Feb 2025Repository

Jscanify: detect and straighten documents in JavaScript

github.comPermalink

Jscanify uses OpenCV.js to detect paper and correct distortion. The repository provides examples for integrating document scanning into browsers or Node.js environments.

JavaScript Document management

15 Feb 2025Documentation

Preact signals for reactive state management

preactjs.comPermalink

The guide introduces signals and automatic dependency tracking in Preact. It explains how state changes update the interface without repeated manual synchronization.

Signals State management JavaScript

25 Jan 2025Article

Generate test values with JavaScript generators

github.comPermalink

This note explores composing generators to test TypeScript type predicates. It connects generated test values with checking the reliability of validation functions.

Testing TypeScript JavaScript

5 Jan 2025Tool

Unstorage: one key-value API for multiple storage backends

unstorage.unjs.ioPermalink

Unstorage provides a common JavaScript interface for memory, filesystems, browsers and cloud services. Drivers can be mounted under different prefixes within one instance.

JavaScript Databases