semver calculator vs npm version
A browser-based semver parser, bumper, and comparator vs Node Package Manager’s built-in npm version command. Both implement the semver.org spec — but for very different workflows.
use semver calculator when…
- you want to understand a version string without writing code
- you need to compare two versions interactively
- you’re working outside Node.js/npm
- you want to plan a bump before editing package.json
- you need to validate a version string quickly
- Node.js is not installed on the machine
use npm version when…
- you’re releasing a Node.js / npm package
- you want to update package.json and create a git tag in one command
- you need pre-release lifecycle management (
premajor,prerelease…) - you want to run lifecycle scripts (
preversion,postversion) - you’re automating releases in CI/CD
| feature | semver calculator | npm version |
|---|---|---|
| install required | ✓ none — browser only | — Node.js + npm |
| works on any OS | ✓ yes | — requires Node.js |
| parse version string | ✓ interactive | — CLI only |
| validate semver.org spec | ✓ live feedback | ✓ errors on invalid |
| bump major/minor/patch | ✓ browser, instant | ✓ updates package.json |
| bump pre-release | ✓ interactive | ✓ premajor/preminor/prepatch/prerelease |
| compare two versions | ✓ side-by-side | — not built-in |
| git tag creation | — not applicable | ✓ creates vX.Y.Z tag |
| lifecycle scripts | — not applicable | ✓ preversion / postversion |
| updates package.json | — not applicable | ✓ in-place edit |
| cost | ✓ free, no account | ✓ free, part of npm |
frequently asked questions
What is the difference between a semver calculator and npm version?
A semver calculator is a browser tool for parsing, comparing, bumping, and validating version strings without any software installed. The npm version command is a CLI tool built into npm that bumps the version in package.json and creates a git tag — it requires Node.js and is tied to the npm release workflow.
Does npm version handle pre-release bumps?
Yes. npm version premajor|preminor|prepatch|prerelease all handle pre-release bumps. The semver calculator provides identical bump logic in the browser — useful for planning or for non-Node.js projects.
When should I use the semver calculator instead of npm version?
Use the semver calculator when you want to understand what a version string means, compare two versions, or validate a string — without writing any code or having Node.js installed. Use npm version when you are releasing an npm package and want to update package.json and create a git tag in one command.