# Jarallax 3.1.0 for Parallax Images and Videos

> Jarallax is a dependency-free TypeScript library for parallax scrolling in modern browsers, with image, YouTube, Vimeo, self-hosted video, React, and server-rendering integration paths. Its main adoption constraint is that it is a browser-only visual effect, not a general-purpose motion or animation framework.

**nk-o/jarallax** — Parallax scrolling for modern browsers

- Repository: https://github.com/nk-o/jarallax
- Website: https://jarallax.nkdev.info
- Stars: 1,454 · Forks: 215
- Language: TypeScript
- License: MIT
- Published: 2026-10-16 · Updated: 2026-10-16 · Language: en
- Canonical page: https://hysenlabs.com/projects/nk-o-jarallax

## Jarallax's Browser-Focused Parallax Scope

Jarallax solves a specific presentation problem: making selected page elements appear to move at different speeds as the user scrolls. The intended users are front-end developers building visual sections with background images, inline images, YouTube videos, Vimeo videos, or self-hosted video files. The project is written primarily in TypeScript, but its published package exposes JavaScript bundles for browsers and Node.js toolchains.

The library is small in scope. Its package description identifies smooth parallax scrolling for background images, videos, and inline elements, with no runtime dependencies and optional jQuery support. That makes it relevant to visual landing pages, editorial sections, and marketing sites where a few carefully selected elements need depth while the rest of the page scrolls normally. It is not a component system, a scroll-state manager, or a general animation timeline.

The repository contains a demo, examples for ES modules, React, React hooks, JavaScript, Next.js App Router, HTML, and jQuery, plus separate source, distribution, test, and TypeScript configuration directories. The README also documents an Advanced Backgrounds WordPress plugin as a separate way to add backgrounds in WordPress content. That plugin should not be confused with the core npm package.

## Image, Video, and DOM Initialization Paths

Jarallax operates in the browser after the relevant DOM elements exist. The core function is called as `jarallax()` and receives a collection of elements. The README's ESM example selects elements with the `.jarallax` class, while the video extension is enabled separately with `jarallaxVideo()`.

For an image-oriented section, the expected markup uses Jarallax classes and an image element. The README excerpt does not show the complete image markup, but the documented mechanism is clear: initialization selects existing page elements and applies the library's behavior to them. The React subpath provides `Jarallax`, `JarallaxImage`, and `JarallaxVideo` components. The README states that these built-in components apply the required base styles automatically and delay DOM work until `useEffect` runs on the client.

The package root is also safe to import in SSR and Node.js toolchains, according to the README. That does not make the effect server-rendered. The library remains frontend-only, so `jarallax()` must be called only after a real browser DOM exists. In Next.js, the documented approach is a client lifecycle or a `typeof window !== 'undefined'` guard. This separation is the main architectural boundary in the package.

## npm Installation and a TypeScript First Use

Install the package from npm, then import the core functions, the stylesheet, and, if needed, the video extension. This first example uses the exact package names and import paths documented in the README. The declaration files are published from `dist/types`, while `typings/index.d.ts` remains a compatibility re-export.

Install the package:

```bash
npm install jarallax
```

Initialize image elements and configure the video extension in a TypeScript module:

```ts
import { jarallax, jarallaxVideo, type JarallaxOptions } from 'jarallax';
import 'jarallax/dist/jarallax.min.css';

const options: JarallaxOptions = {
  speed: 0.2,
  videoSrc: 'https://www.youtube.com/watch?v=ab0TSkLe-E0',
};

jarallaxVideo();
jarallax(document.querySelectorAll<HTMLElement>('.jarallax'), options);
```

The reader should see the stylesheet loaded by the bundler, the video extension initialized, and the selected `.jarallax` elements initialized with the supplied options. The README also documents a plain ESM import from the self-hosted `dist/jarallax.esm.js` file and CDN imports through jsDelivr. The package version in `package.json` is `3.1.0`; the repository has no GitHub releases.

## React and Next.js Integration Constraints

Jarallax has a dedicated React integration rather than requiring application code to construct effects manually. The documented component example uses `Jarallax` for a container, `JarallaxImage` for an image, and `JarallaxVideo` for a video background. A custom-markup alternative uses `useJarallax`, which returns a ref that the application places on its own section.

A React image section can follow this pattern:

```tsx
'use client';

import {
  Jarallax,
  JarallaxImage,
} from 'jarallax/react';

export function Hero() {
  return (
    <Jarallax className="hero" options={{ speed: 0.4 }}>
      <JarallaxImage
        src="https://jarallax.nkdev.info/images/image-1.jpg"
        alt=""
      />
      <h1>Jarallax React</h1>
    </Jarallax>
  );
}
```

The `'use client'` directive is significant. The README describes `jarallax/react` as SSR-safe because it delays DOM work until `useEffect`, but the component still belongs to a client-side runtime. The package exports a separate `./react` entry point, so applications should use that path rather than importing React support from the package root. The repository includes both basic and advanced Next.js App Router examples, which are the relevant files to consult when deciding how to place initialization.

## Parallax Media Choices and Runtime Boundaries

The library supports images, YouTube, Vimeo, and self-hosted video. The documentation also lists image backgrounds, inline elements, and background video usage examples. This breadth is useful when a design system needs one parallax mechanism across different media sources, but it does not mean that every provider behaves identically. A remote YouTube or Vimeo source introduces external playback and availability concerns. A self-hosted source gives the application control over the file, but the README does not document supported codecs, responsive video formats, or a poster-image policy.

The README also does not document a rollback strategy, a scheduling guarantee, or a performance budget. It provides no browser support details beyond the phrase "modern browsers." The package is distributed in UMD, ESM, and CommonJS forms, which gives bundlers and older browser-targeted build setups several entry paths. The absence of runtime dependencies is documented in the package description, although the CDN examples rely on an external CDN when that option is selected.

Jarallax is therefore a good fit when the page already has suitable markup and the intended effect is scroll-linked movement. It is the wrong tool when the requirement is a complete scroll animation system, a long timeline with many linked actions, or behavior that must run independently of a browser DOM.

## Reduced Motion, Mobile Controls, and Maintenance Status

The README lists reduced-motion behavior and disabling the effect on mobile devices among the available options. These controls matter because parallax can be distracting or costly on a page intended for many visitors. An adopter must inspect the current options documentation or source for the exact option names and defaults before relying on either setting.

The project is not archived. Its last push was on 2026-08-18, which places it within the recent maintenance window relative to the repository information. The repository has no GitHub releases, so version history and upgrade communication are less visible than they would be for a release-heavy project. The package version is still identifiable as `3.1.0` in `package.json`.

The MIT license permits use, modification, distribution, and private use under the license conditions, subject to the actual license text. That is a licensing summary, not legal advice. Upgrade cost is mostly tied to reviewing changes between npm versions and checking the React entry point, generated declarations, CSS paths, and video options. The repository includes a `CHANGELOG.md`, but the README excerpt does not provide its contents, so no specific upgrade behavior can be claimed.

## Jarallax Compared with CSS-Only Background Effects

A direct alternative is a CSS-only background treatment, such as a static background image or a background-position change handled by application code. CSS is simpler when the visual requirement is limited to a static hero or a small change in background position. It avoids adding a JavaScript parallax runtime, although it does not provide Jarallax's documented media and lifecycle integrations.

Jarallax differs by offering a dedicated scroll-linked effect across inline images, background images, YouTube, Vimeo, and self-hosted videos. It also supplies jQuery and React paths, generated TypeScript declarations, and an explicit browser-only initialization model. CSS-only code would need its own responsive handling, reduced-motion policy, and framework integration. Jarallax centralizes those concerns in a library, at the cost of adding a runtime and requiring the DOM lifecycle to be handled correctly.

The choice is functional. Use CSS when a static or narrowly scripted treatment is enough. Use Jarallax when the page needs its documented parallax behavior and can accommodate a frontend-only library.

## Conclusion

Adopt Jarallax for a controlled image or video hero that fits its documented browser and SSR model. Do not choose it for general animation work or environments without a real DOM. Verify your video source, preferred React or bundler import, reduced-motion behavior, and mobile-device handling before release.

## FAQ

### How do I install Jarallax and initialize an image parallax section?

Install it with `npm install jarallax`, import `jarallax` and the stylesheet, then call `jarallax()` with selected `.jarallax` elements after the browser DOM exists. The README also documents ESM, UMD, CDN, TypeScript, React, and Next.js import paths.

### Does Jarallax support React and Next.js without breaking server rendering?

Yes, the package root and `jarallax/react` subpath are described as SSR-safe for import purposes, and React integration delays DOM work until `useEffect`. Jarallax remains frontend-only, so the effect must initialize only on the client.

### Which media sources can Jarallax use for parallax effects?

The README and package description list image elements, background images, YouTube, Vimeo, and self-hosted videos. Video support is enabled separately with `jarallaxVideo()`.

## Sources

- [Issues](https://github.com/nk-o/jarallax/issues)
- [License: MIT](https://github.com/nk-o/jarallax/blob/master/LICENSE)
- [nk-o/jarallax on GitHub](https://github.com/nk-o/jarallax)
- [Project website](https://jarallax.nkdev.info)
- [README](https://github.com/nk-o/jarallax/blob/master/README.md)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/nk-o-jarallax