Development · head-to-head
CDNJS vs Kroki
cdnjs mirrors thousands of open-source JavaScript, CSS, and font libraries on Cloudflare's edge network, and its free `/libraries` and `/libraries/:library` endpoints expose the same catalogue as JSON — name, latest version, file list, SRI hashes, and linked GitHub metadata — backed by Algolia search. No key or signup is required for either the asset CDN or the metadata API, and responses cache for six hours server-side.
Kroki puts a single unified HTTP API in front of two dozen open-source diagram-as-code renderers, including PlantUML, Mermaid, GraphViz, D2, BPMN, Excalidraw, and WaveDrom, so callers send diagram source text and get back an image with no local toolchain to install. A GET request embeds the (deflate+base64-encoded) diagram directly in the URL, making it trivial to drop live diagrams straight into Markdown or HTML. The project and its public instance at kroki.io are free and open source, with self-hosting via Docker documented for anyone who needs a private instance.
| CDNJS | Kroki | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | JSON | SVG, PNG, PDF, JPEG |
| CORS | yes | yes |
| HTTPS | Yes | Yes |
Kroki supports 4 response formats, while CDNJS offers fewer — pick Kroki for more integration flexibility.