> JSS is an open-source CSS-in-JS library for styling web apps. Learn what it does on a website and why it has no impact on GDPR cookie consent.
>
> Canonical: https://www.flowconsent.com/en/services/framework/jss

Frameworks

# JSS

Unclassified · [Official website](https://cssinjs.org/)

JSS is an open-source CSS-in-JS library that lets developers write styles in JavaScript and generates the corresponding CSS in the browser or on the server. It was used as the styling engine of Material UI up to version 4 and offers plugins for nesting, vendor prefixes and theming. It runs as part of a site's code and does not set cookies.

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At a glance

- Category

  [Frameworks](https://www.flowconsent.com/en/services/framework)

- Consent

  Unclassified

- Prior consent

  Required

- Documented cookies

  0

Compliance

## JSS and the GDPR

JSS is classified as “Unclassified”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy.

Cookies and trackers

## What JSS sets and contacts

The cookies of JSS are not documented in the catalog yet. To see what is actually set on your site, run a free scan.

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Same category

## More services: Frameworks

[See the whole category](https://www.flowconsent.com/en/services/framework)

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[Syncfusion is a foundational web service that powers critical website functions and digital experiences. It provides reliable infrastructure, seamless integration capabilities, and consistent performance across all devices and browsers. Syncfusion supports modern development practices and scales with growing business needs. With a focus on stability and compatibility, Syncfusion ensures your website delivers a smooth, uninterrupted experience to every visitor and search engine crawler.](https://www.flowconsent.com/en/services/framework/syncfusion)

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·

### [Cecil](https://www.flowconsent.com/en/services/framework/cecil)

[Cecil is a foundational web service that powers critical website functions and digital experiences. It provides reliable infrastructure, seamless integration capabilities, and consistent performance across all devices and browsers. Cecil supports modern development practices and scales with growing business needs. With a focus on stability and compatibility, Cecil ensures your website delivers a smooth, uninterrupted experience to every visitor and search engine crawler.](https://www.flowconsent.com/en/services/framework/cecil)

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### [Swiffy Slider](https://www.flowconsent.com/en/services/framework/swiffy-slider)

[Swiffy Slider is an image management and optimization solution that helps websites deliver high-quality visual content with optimal performance. It provides automatic compression, format conversion, and responsive delivery for fast page loads. Swiffy Slider supports lazy loading, CDN distribution, and gallery creation, enabling businesses to showcase visuals beautifully while maintaining excellent Core Web Vitals scores and search engine rankings.](https://www.flowconsent.com/en/services/framework/swiffy-slider)

[Frameworks](https://www.flowconsent.com/en/services/framework/swiffy-slider)

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### [Fluid Framework](https://www.flowconsent.com/en/services/framework/fluid-framework)

[Fluid Framework is a development framework and toolkit providing developers with a structured foundation for building modern web applications. It offers reusable components, standardized architecture patterns, and comprehensive documentation. Fluid Framework accelerates development through code generation, testing utilities, and build optimization. With an active community and extensive ecosystem, Fluid Framework enables teams to build scalable, maintainable applications following industry best practices.](https://www.flowconsent.com/en/services/framework/fluid-framework)

[Frameworks](https://www.flowconsent.com/en/services/framework/fluid-framework)

·

### [shadcn/ui](https://www.flowconsent.com/en/services/framework/shadcn-ui)

[shadcn/ui is a foundational web service that powers critical website functions and digital experiences. It provides reliable infrastructure, seamless integration capabilities, and consistent performance across all devices and browsers. shadcn/ui supports modern development practices and scales with growing business needs. With a focus on stability and compatibility, shadcn/ui ensures your website delivers a smooth, uninterrupted experience to every visitor and search engine crawler.](https://www.flowconsent.com/en/services/framework/shadcn-ui)

[Frameworks](https://www.flowconsent.com/en/services/framework/shadcn-ui)

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### [Three.js](https://www.flowconsent.com/en/services/framework/three-js)

[Three.js is a versatile web technology that supports digital platforms with specialized functionality and enhanced capabilities. It provides robust tools and services that integrate with modern websites and applications seamlessly. Three.js is designed to improve operational efficiency, user experience, and digital performance. Trusted by developers and businesses alike, Three.js offers reliable solutions that scale with organizational needs and evolving web standards.](https://www.flowconsent.com/en/services/framework/three-js)

[Frameworks](https://www.flowconsent.com/en/services/framework/three-js)

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