Express User-Agent Parser

express-useragent is a robust and fast user-agent parsing library designed for Node.js environments, offering dedicated Express.js middleware and comprehensive TypeScript typings. Currently stable at version 2.1.0, the package underwent a significant rewrite in version 2.0.0, migrating to ES Modules and TypeScript, and now requires Node.js 18 or newer. Its release cadence appears active, with recent patches addressing bug fixes and dependency updates. Key differentiators include its first-class integration with Express, which populates `req.useragent` with parsed data, and its ability to parse user-agent strings directly via a `UserAgent` class instance. It also provides lightweight browser bundles for client-side parsing.