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Cdnjs

Cloudflare-backed public CDN for versioned assets from open-source web libraries.

What it is

cdnjs is a free, community-run CDN for open-source web-library assets, delivered through Cloudflare. Consumers select a library, exact version and file, then reference its public URL; the service also exposes library metadata through an API. Example markup published by Cloudflare uses a versioned URL and Subresource Integrity attributes. cdnjs' code repository is MIT-licensed, but each distributed library keeps its own license. It is a dependency-delivery service rather than private storage, a package-security review or a contractual availability guarantee.

Key features

  • Library catalog

    Indexes versioned files from supported open-source JavaScript and CSS libraries.

  • Cloudflare delivery

    Serves cached public assets through Cloudflare's network.

  • API access

    Exposes library, version and file metadata for discovery and tooling.

  • Integrity-ready snippets

    Provides examples and hashes that can be used with browser SRI and crossorigin attributes.

Strengths and trade-offs

What works well

  • No-cost public delivery: Supported open-source library assets are served globally through Cloudflare.
  • Versioned paths: URLs can identify an exact library release and file for reproducible front-end loading.
  • Integrity metadata: Published examples support browser Subresource Integrity checks when the correct hash is used.
  • Open project and API: Public repositories and metadata endpoints make the catalog inspectable and automatable.

Where it falls short

  • Catalog scope is narrow: It is not private asset storage or a general-purpose origin/CDN product.
  • Package trust remains external: CDN availability does not prove that a library release or transitive code is safe.
  • Third-party dependency: Page delivery, privacy posture and CSP must account for requests to an external domain.
  • Licenses vary: The cdnjs repository license does not replace the license of each hosted library.

Who it is for

Front-end developers who need simple public delivery of a supported open-source dependency and can pin, audit and fall back from that dependency.

Our verdict

cdnjs is a convenient free path for public, versioned web dependencies; use exact versions and valid SRI, review the library's own license and code, and self-host or provide a fallback when availability, privacy or supply-chain control is critical.

Closest alternatives we track

Same category, ordered by verified starting price.

What we checked

  • Public APIOffers a documented API you can build against.Yes
  • Mobile appHas a native app for iOS or Android, not just a mobile website.No
  • Open source / self-hostableSource is open and the tool can be run on your own infrastructure.Yes
  • SSO (SAML)Supports SAML single sign-on on at least one plan.No

“Not checked” means exactly that — we have not verified it, and we do not guess.

Evidence and freshness

Status: Official sources reviewedReviewed: 2026-08-24

  • Cloudflare — cdnjs service ↗

    Checked 2026-08-24 · Supports: open-source library delivery, Cloudflare operation, versioned URL example, Subresource Integrity example, one-year asset caching, terms privacy and abuse-policy boundary, aggregate usage measurement

  • cdnjs — Asset repository ↗

    Checked 2026-08-24 · Supports: public asset repository, automated repository role, separate package metadata repository, separate website and API repositories, MIT project license, per-library license distinction, Cloudflare sponsorship

  • cdnjs — Package metadata repository ↗

    Checked 2026-08-24 · Supports: package definitions, automatic-update configuration, community contribution workflow, catalog maintenance boundary

  • cdnjs — API repository ↗

    Checked 2026-08-24 · Supports: public API implementation, library metadata access, open-source API code

Limit: Official Cloudflare and cdnjs repositories were reviewed; ToolCompare did not benchmark delivery, test a live outage or fallback, audit package provenance, scan hosted releases for malware, verify every SRI hash, assess privacy or licensing for a specific application, or obtain an availability SLA. Library contents, versions and policies can change.

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