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API · /semver-api

Semver API

healthy 4,209 Subscribers

A Semantic Versioning (SemVer 2.0.0) toolkit as an API. Parse a version string into its major, minor, patch, prerelease and build parts; compare two versions; test whether a version satisfies an npm-style range (^1.2.3, ~1.4, >=2 <3, 1.x); increment a version to the next major, minor, patch or prerelease; and filter a list of versions by a range to find which match and the highest and lowest satisfying. Powered by the canonical node-semver. Perfect for dependency and release tooling, CI gates, update checkers, compatibility rules and package dashboards. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 6 endpoints. Distinct from package-registry lookups and vulnerability databases.

#semver #versioning #npm #release #dependencies #developer-tools
api.oanor.com/semver-api
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Machine-readable spec so AI agents can integrate this API.

/api/semver-api/openapi.json
/api/semver-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
85 ms
Server probes · 24h
Subscribers
4,209
active
Total calls
90
last 7 days
status Full status page → · 18 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 620 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 620 calls/month
  • 2 req/sec
  • Parse + compare + satisfies + inc + range
  • No credit card
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Starter

€0.40 /month

  • 4,700 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 4.7k calls/month
  • 8 req/sec
  • npm-style ranges
  • Email support
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Pro

€17.60 /month

  • 118,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 118k calls/month
  • 20 req/sec
  • CI / release pipelines
  • Priority support
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Mega

€53.60 /month

  • 610,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 610k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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npm Download Stats API

How popular is that npm package? Get download counts and trends for any npm package straight from npm's public download API. Pull the total downloads over a period (last day, week, month, year or any custom YYYY-MM-DD:YYYY-MM-DD range), the full per-day download time series, the monthly totals over the last year to spot growth or decline, and compare several packages side by side ranked by downloads (up to 128 at once, scoped @org/name packages supported). Every call is live (no cache). 5 endpoints. Built for popularity dashboards, package-comparison pages, trend charts, dependency-health scoring and "which library won" analyses. Distinct from an npm registry-metadata lookup — this is the download time series. No upstream key, no cache.

api.oanor.com/npmstats-api

Bundle Size API

How big is that npm package? Get the minified and gzipped bundle size of any npm package — plus its dependency count, the size contributed by each dependency, peer dependencies, whether it ships an ES module and whether it is side-effect-free — in a single call. Pin a version ([email protected]) or get the latest, and pull the bundle size across a package's recent versions to spot regressions over time. Powered by the public Bundlephobia service; results are live (no cache). 3 endpoints. Built for frontend performance budgets, bundle-size CI checks, "cost of adding this dependency" tooling, and dependency dashboards. Distinct from a plain npm registry lookup (metadata) or a dependency-graph service — this measures actual shipped bytes. No upstream key, no cache.

api.oanor.com/bundlephobia-api

npm Registry API

Everything about npm packages in one clean API. Look up a package’s latest metadata — version, description, license, homepage, repository, author, keywords, dist-tags, dependencies and maintainers — list its full version history with release dates, pull download statistics for the last day, week, month or year, and search the registry across more than three million packages. Sourced live from the public npm registry and returned as tidy JSON through a fast, reliable API. Ideal for developer dashboards and tooling, package and dependency analytics, supply-chain and security checks, CI/CD and documentation sites.

api.oanor.com/npm-api

deps.dev API

Software supply-chain and dependency intelligence as an API, powered by deps.dev — Google's Open Source Insights service. Across six package ecosystems (npm, PyPI, Maven, Cargo, Go and NuGet) it answers the questions a registry cannot: what does installing this package actually pull in, and how healthy is the project behind it. List a package's published versions and its default version; read a specific version's declared licenses, the keys of any known security advisories, useful links (source repository, homepage, issue tracker) and related projects; resolve a version's complete TRANSITIVE dependency graph — the total dependency count, the direct dependencies and every transitive node with its exact resolved version and whether it is a direct or indirect dependency; and look up a source project's OpenSSF Scorecard — the overall security score plus per-check results for Maintained, Code-Review, Branch-Protection, Dangerous-Workflow, Vulnerabilities and more — alongside its stars, forks, open issues, license and homepage. For Go modules and Maven artifacts the package name is the full module path or group:artifact (URL-encoded automatically). Ideal for dependency auditing, software-bill-of-materials (SBOM) enrichment, supply-chain risk assessment and license-compliance tooling. Data from deps.dev (Google, CC-BY).

api.oanor.com/depsdev-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Semver API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Semver API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Semver API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Semver API cost?
Semver API has a free tier with 100 calls / month. Paid plans start at €0.40 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Semver API GDPR-compliant?
All requests to Semver API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/semver-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/semver-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/semver-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/semver-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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