DEV3 Free Website Tech Stack Detector — Source Code (Next.js + MongoDB)

Source code of the DEV3 Website Tech Stack Detector, a technology detector that fingerprints CMS, frameworks, analytics, CDN, hosting and ecommerce from headers, markup, script URLs and the generator tag using an original rule list.

Free download: sign in to any DEV3 account and click Download ZIP. Try it live: https://dev3.tech/tools/website-tech-stack-detector shows the finished tool running.

What is in the download

• Route handlers and pages for the Next.js App Router
• The service layer, Mongoose models and the UI components, in a dev3-tools/ folder that cannot clash with your own files
• README.md (install, environment, customise), .env.example and an MIT LICENSE

What the code does

• About 90 hand-written rules in a single typed array
• Evidence shown for every match, with version when visible
• One capped page fetch through the SSRF guard
• Grouped results with copy-to-clipboard

Tech stack

Next.js 15 (App Router), React 19, TypeScript, Mongoose on MongoDB, Tailwind CSS 4.

Install and customise

The How to install and How to use tabs list the steps. In short: copy the module into a Next.js app, install the listed packages, add the MongoDB connection string and run it.

Good to know

• This is server code: you need a MongoDB database and your own hosting.
• Only the home page response is inspected; the rule list covers common tools only.