**is‑semver** is a tiny Node.js utility that validates whether a given string conforms to the [Semantic Versioning](https://semver.org/) specification. It exports a single function (`isSemver(input)`) that returns `true` for valid version strings like `"1.2.3"` and `false` otherwise, making it useful for developers who need a lightweight, zero‑dependency check in build tools, CI scripts, or any JavaScript project that works with version numbers.