How can I find out which JavaScript framework a website uses?

Paste the site's URL into the Framework Detector and run the scan. It analyzes the page's code for framework fingerprints and reveals whether the site runs on React, Next.js, Vue, Angular, Svelte, or another framework — in seconds.

How does the framework detector work?

Frameworks leave distinctive marks in the HTML: Next.js pages include /_next/ assets and __NEXT_DATA__, Nuxt leaves __NUXT__, Angular adds ng-version attributes. The detector scans the page source for these fingerprints.

Can it detect the exact framework version?

Sometimes. When version strings appear in asset URLs or meta tags, they are shown as evidence. Many production builds strip versions, so the tool reports the framework even when the version is not visible.

Why does it list more than one framework?

Sites often combine technologies, for example a WordPress site with a React-powered widget, or Next.js with an embedded Vue component. The tool lists everything it finds so you see the full picture.

Does it work on single-page apps?

Yes, usually better than on static sites: client-rendered apps ship large JavaScript bundles full of framework fingerprints, which the detector reads from the initial HTML.

Can it detect backend frameworks like Laravel or Django?

Only indirectly, through cookies or headers they set. The tool checks for common backend fingerprints too, but front-end detection is its strength.

TECHNOLOGY DETECTION TOOLS · FREE ONLINE TOOL

Framework Detector

Detect the JavaScript framework any site is built withAsk five developers for the best JavaScript framework and you will get six opinions. Ask this checker what a website actually uses and you get a fact, with the evidence for each match attached.

✓ Free to use✓ No sign-up✓ Ready in your browser

// FRAMEWORK DETECTOR · GET STARTED

Use Framework Detector

Detect the JavaScript framework any site is built with

// FRAMEWORK DETECTOR · HOW IT WORKS

How to use the Framework Detector

Enter URL

Enter the website URL (e.g. example.com).

Scan the page

Click "Detect frameworks" to scan the page source.

See frameworks

See every framework found with the evidence behind it.

// FRAMEWORK DETECTOR · ABOUT THIS TOOL

About the Framework Detector

Every framework leaves fingerprints: Next.js ships /_next/ assets, Nuxt leaves __NUXT__ state, Angular stamps ng-version. This detector fetches the public HTML and matches it against a fingerprint library of widely used JavaScript frameworks.

Use it for competitive research or to audit your own stack. Every finding includes the exact evidence, and the tool lists multiple frameworks when a site combines them.

Where it helps most

Technology decisions where facts beat opinions.

Choose your stack

Developers choosing technology for a new project treat it as a data point when every fast site in their space runs Next.js with Tailwind.

Vet hiring claims

Recruiters and hiring managers check a company's site to see whether the advertised stack matches reality before a candidate walks in.

Compare performance

Performance-minded engineers compare a server-rendered Next.js store against a client-heavy React SPA and read the speed difference as a technology decision.

Learn from the best

Spot a site whose interactions you admire, run it through the checker, and walk away with a concrete reading list of libraries.

What detection sees

Frontend fingerprints are visible; backends mostly are not.

Distinctive fingerprints

Frameworks leave fingerprints behind: React's data attributes, the __NEXT_DATA__ payload for Next.js, Angular's ng-version attribute, plus Svelte's compiled classes.

Backend stays hidden

The detection only sees what ships to the browser, so backend frameworks stay out of scope unless they leak a header.

Minification blurs detail

Heavy bundling and minification can obscure library names, though framework-level fingerprints like data attributes and build payloads usually survive.