The `useragent` package, currently at version 2.3.0, is an abandoned Node.js library designed for parsing user agent strings. It was developed to provide high accuracy by leveraging hand-tuned regular expressions derived from Browserscope's research, aiming to correctly identify browser names and versions where generic parsers might fail. The library differentiated itself through a benchmark-driven approach, claiming superior performance with a pre-compiled regular expression library and deferred parsing for OS and device information. It also offered an optional feature to fetch live, updated parsing rules from remote servers, requiring additional `yamlparser` and `request` dependencies. However, the package has not seen updates since its last publish 8 years ago, indicating it is no longer actively maintained and its user agent data is significantly out of date, making it unsuitable for modern applications.
npm install useragentVerified import paths — ran on the pinned version, not inferred.
Demonstrates basic usage of `useragent.parse()` with server-side and optional client-side user agent strings, and how to access parsed properties.
Migrate to a actively maintained and up-to-date user agent parsing library (e.g., 'ua-parser-js', 'platform').
Ensure your project is configured for CommonJS or use a bundler that transpiles CommonJS modules for ESM environments. Alternatively, choose a modern library that supports ESM natively.
Avoid using the `useragent(true)` feature. If you must use this library, rely solely on its bundled, albeit outdated, definitions. Preferably, migrate to a modern, actively maintained user agent parser.
Benchmark against current alternatives if performance is critical for modern user agents; however, the primary issue remains the outdated parsing database.
Ensure your file is a CommonJS module (e.g., by using `.js` extension with `"type": "commonjs"` in `package.json` or by not setting `"type": "module"`). If using ESM, you might need to use `import * as useragent from 'useragent';` or a build tool to handle CJS imports.
To use the live update feature, you must explicitly install `yamlparser` and `request` via `npm install yamlparser request --save`. However, this is strongly discouraged due to the age and known vulnerabilities of these dependencies.
This issue cannot be fixed within this library. You must switch to a different, actively maintained user agent parsing library that receives regular updates.