semver

The semantic version parser used by npm — parse, compare, and satisfy version ranges.

semver

General JS

The semantic version parser used by npm — parse, compare, and satisfy version ranges.

npm GitHub Docs

Fit

Bundle (gzip)

7.7 kB

25.0 kB raw

Install size includes transitive dependencies. Bundle size is gzipped browser payload.

Freshness

The Problem

Comparing version strings like 1.2.10 vs 1.2.9 with plain string or numeric comparisons is wrong, and checking whether a version satisfies a range such as ^1.4.0 by hand is tedious and bug-prone.

What It Does

semver implements the SemVer spec: it parses versions, compares them correctly, and tests them against ranges (^, ~, >=, etc.). It powers npm's own dependency resolution and is a foundational dependency across the ecosystem.

Installation

bash

npm install semver

Usage Example

import semver from "semver";

semver.gt("1.2.10", "1.2.9");        // true
semver.satisfies("1.4.2", "^1.4.0"); // true
semver.coerce("v2.3").version;        // "2.3.0"
semver.inc("1.0.0", "minor");         // "1.1.0"

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