SemVer Calculator & NPM Range Evaluator
Evaluate NPM version range expressions (^, ~, >=), compare version precedence, and calculate next release bumps.
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(CLS Prevention Active · Zero Shift)Semantic Versioning (SemVer) Calculator & NPM Range Evaluator
Semantic Versioning (SemVer 2.0.0) is the globally accepted standard for communicating software compatibility and change severity across software releases. Built upon the three-part `MAJOR.MINOR.PATCH` numeric schema (e.g. 2.4.1) supplemented by pre-release tags (e.g. -alpha.1, -rc.2), it enables developers and package managers (npm, yarn, pnpm, cargo, pip) to anticipate upgrade risks deterministically.
Within `package.json`, expressions such as caret (`^1.2.3`), tilde (`~1.2.3`), wildcards (`1.x`, `*`), and relational inequalities (`>=1.0.0 <2.0.0`) can obscure the precise minimum and maximum resolved boundaries accepted during dependency installation. This opacity frequently leads to breaking changes slipping into production during routine minor package updates.
OrvoKit SemVer Calculator evaluates package range specifiers, visualizes their exact satisfying version boundaries, and provides a precise comparator to rank any two version strings according to standard SemVer precedence. It also features a one-click Version Bump tool to generate next-generation release tags instantly.
SemVer 2.0.0 Precedence Rules & Lexicographical Ordering
How MAJOR, MINOR, and PATCH integers are evaluated from left to right, followed by dot-separated pre-release identifier comparison.
When numeric identifiers match, a normal release always supersedes a pre-release version (1.0.0 > 1.0.0-beta). Pre-release segments are evaluated segment-by-segment: numeric tokens are compared numerically, while alphanumeric tokens are compared ASCII lexicographically.
👉 Clear understanding of satisfying bounds eliminates accidental breaking upgrades.
NPM Version Range Operators & Satisfied Ranges Reference
Official npm dependency range syntax and corresponding resolved boundaries
| Operator | Example Syntax | Resolved Version Boundary | Description & Safety | Recommended Use Case |
|---|---|---|---|---|
| Exact Pin | 1.2.3 | = 1.2.3 (Exact match only) | Never updates automatically | Production deployments, strict builds |
| Tilde (~) | ~1.2.3 | >= 1.2.3 < 1.3.0 | Accepts only bug fixes (Patch) | Conservative library maintenance |
| Caret (^) | ^1.2.3 | >= 1.2.3 < 2.0.0 | Accepts backwards-compatible features | Default npm behavior, general dev |
| Caret Zero (^0.x) | ^0.2.3 | >= 0.2.3 < 0.3.0 | In 0.x, minor changes may break compatibility | Pre-v1 beta dependencies |
| Inequality Range | >=1.0.0 <2.0.0 | >= 1.0.0 < 2.0.0 | Explicit boundary thresholds | Enterprise framework constraints |
| Wildcard (* / x) | 1.x or 1.2.x | >= 1.0.0 < 2.0.0 / >= 1.2.0 < 1.3.0 | Matches all versions in wildcard slot | Broad utility tool plugins |
| Hyphen Range | 1.2.0 - 2.3.0 | >= 1.2.0 <= 2.3.0 | Inclusive range matching | Legacy library spans |
* Under SemVer 2.0.0, Major version 0 (0.y.z) represents initial development where anything may change at any time.
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(CLS Prevention Active · Zero Shift)How to Use
11. Input Version or Range Expression
Enter any semantic version (e.g., `1.4.2`, `2.0.0-rc.1`) or range operator (e.g., `^1.2.3`, `~2.0.0`) into the input field.
22. Choose Mode (Range Resolver, Version Comparator, Version Bump)
Select the operational tab: evaluate npm ranges, compare precedence between two versions, or preview release increments.
33. Inspect Satisfied Boundaries & Precedence
Review the lower and upper limits satisfying the expression, alongside explicit precedence results (V1 > V2).
44. Copy Result to package.json
Copy the verified range or next bumped version string directly into your project's dependency manifest.
Practical Dependency Management Scenarios
Situations where precise version calculation prevents developer regressions
Diagnose why a teammate received a newer minor version than your local setup.
Accurately compute next release tags: Minor (1.2.0 -> 1.3.0) or Patch (1.2.0 -> 1.2.1).
Validate internal package dependency ranges across Turborepo or Lerna configurations.
Ensure strict SemVer compliance before publishing updates to public npm registries.
💡 Dependency Management & SemVer Best Practices
Even with caret (^) ranges, committed lockfiles ensure deterministic, byte-identical installs across CI/CD and developer machines.
Run `npm ci` instead of `npm install` during container builds to install the exact pinned versions from your lockfile.
Pre-1.0 libraries frequently introduce breaking changes in minor releases; use tilde (~) or exact pins for 0.x dependencies.
⚠️ Common Pitfalls & Mistakes to Avoid
Frequently Asked Questions (FAQ)
Expert answers to the most frequently asked questions and edge cases.
Increment MAJOR when making incompatible API changes, MINOR when adding backwards-compatible functionality, and PATCH when applying backwards-compatible bug fixes.
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