React leads new builds, jQuery still runs the long tail, and meta-frameworks are the real story. A practical look at the JavaScript framework landscape, and how to tell which one a site uses.
React is the default for new builds, but the bigger shift is one layer up: teams now reach for meta-frameworks like Next.js, Astro and SvelteKit rather than raw libraries. And the single most-detected front-end script on the web is still jQuery, by a wide margin. Here is the current landscape and how to read which framework any site runs.
"Most popular" hides a trick question. Popular among developers starting something new in 2026 is React, with Vue and Svelte behind it. Popular across the web as it actually exists right now is jQuery, a library most new projects have abandoned but that still sits on a huge share of live sites. Both answers are true. They just measure different things.
The library that refuses to die
In our own index, jQuery appears on more sites than every modern framework combined. It is not close. That gap exists because the web is mostly old: WordPress themes, plugins, and a decade of sites that shipped jQuery and never had a reason to rip it out. If you are auditing the live web rather than the conference stage, jQuery is the most important name on the list.
The lesson for anyone reading a stack: do not confuse what is trendy with what is deployed. They are years apart.
The modern framework landscape
Among frameworks people actually choose for new work, the field has settled into a short list. Here is what each one is and the signal it leaves on a page.
| Framework | What it is | Best for | How to spot it |
|---|---|---|---|
| React | The dominant UI library | Apps, dashboards, most new SPAs | data-reactroot, React DevTools hook |
| Vue | Approachable reactive framework | Teams wanting structure with less ceremony | data-v- attributes, the Vue global |
| Angular | Full, opinionated framework | Large enterprise apps | ng- attributes, ng-version tag |
| Svelte | Compiler, ships little runtime | Lean, fast front-ends | Scoped svelte- class hashes |
The real story is the meta-framework
The interesting movement in 2026 is not React versus Vue. It is that almost nobody ships a raw library anymore. They ship a meta-framework: Next.js on top of React, Nuxt on Vue, SvelteKit on Svelte, and Astro across all of them. These handle routing, rendering and builds so teams do not assemble it by hand.
This changes what detection means. A site can be "a React site" and "a Next.js site" at once, and the meta-framework is usually the more useful label. It tells you how the site renders, where it is hosted, and how it deploys. The Next.js docs are a good primer on why this layer took over.
- Next.js: the most common React meta-framework, often paired with Vercel.
- Nuxt: the Vue equivalent.
- SvelteKit: Svelte's full-stack framework.
- Astro: content-first, ships zero JavaScript by default and pulls in any framework only where needed.
How to tell which framework a site uses
You can usually identify the framework from the outside in under a minute. Open the page source and search for the tells in the table above: a __NEXT_DATA__ script is Next.js, a data-v- attribute is Vue, an ng-version is Angular. For anything that renders late or hides its fingerprints, you need a tool that runs the page rather than reads the raw HTML.
That is the gap between guessing and knowing, and it is the whole point of our technology directory: look up a domain and see the framework, the meta-framework, and the host it sits on, with the signal that proved each one.
See the framework behind any site.
Open the directoryFAQ
What is the most popular JavaScript framework in 2026?
Among new builds, React leads, followed by Vue and Svelte. Across all live sites, jQuery is still the most-detected front-end script by a wide margin because so much of the existing web was built with it.
Is jQuery still used?
Heavily. New projects rarely start with it, but it remains on a large share of existing sites, especially WordPress themes and plugins. In our index it appears on more sites than React, Vue and Next.js combined.
What is the difference between React and Next.js?
React is a UI library for building components. Next.js is a framework built on top of React that adds routing, server rendering, and a build system. A site can be both at once; the Next.js label usually tells you more about how it runs.
How do I check which framework a website uses?
Read the page source for tells like a __NEXT_DATA__ script (Next.js), data-v- attributes (Vue), or ng-version (Angular). For frameworks that load late, use a detection tool that renders the page, then look up the domain for the full stack.
