cdnjs API

Name: cdnjs API
Brand: cdnjs API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentDeveloper ToolsPackage Registrynone5 EndpointsREST

For Agents

Browse and look up the cdnjs library catalogue - find a JavaScript or CSS library version, retrieve its files with SRI hashes, and read CDN statistics.

Install Jentic One Beta

Connect the cdnjs API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the cdnjs API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with cdnjs API.

Browse the full cdnjs library catalogue with optional name search

Fetch metadata for a specific library, including all available versions

Retrieve a library version's file list with subresource integrity hashes

GET STARTED

Start building with cdnjs API

Explore with Jentic

View OpenAPI Document

Use Cases

Patterns agents use cdnjs API for, with concrete tasks.

★ Library Version Discovery for Build Tooling

Build tools and dev assistants use the cdnjs API to find the latest version of a library and pin it in HTML script tags. The agent calls the libraries endpoint with the library name, reads the latest field, and emits a script tag with the matching SRI hash for safer in-browser inclusion.

GET /libraries/jquery and emit the latest version's CDN URL with its SRI hash

SRI-Verified Asset Inclusion

Security-conscious teams require subresource integrity hashes on every CDN-loaded asset. The cdnjs API returns SRI hashes for every file in a versioned library, so an agent can render correct integrity attributes in HTML or templating systems without manual hash computation.

GET /libraries/bootstrap/5.3.0 and return the script tag for bootstrap.min.js including its sri hash as the integrity attribute

Catalogue Search and Library Recommendation

An assistant helping developers pick a charting or UI library searches the cdnjs catalogue for matching libraries, returns the top hits, and shows version counts and last-update times. The libraries endpoint accepts a search query string and returns a paginated listing for further inspection.

GET /libraries?search=chart and summarise the top three charting libraries by version count

AI Agent Integration via Jentic

A web build assistant uses Jentic to call cdnjs operations as part of a longer workflow that also touches package registries and bundler configs. Jentic standardises the call pattern so the agent doesn't keep its own ad-hoc HTTP client for each API.

Use Jentic to search 'find a JavaScript library version on cdnjs', load the schema for /libraries/{library}, and execute for 'react'

Key Endpoints

5 endpoints — jentic publishes the only available openapi specification for the cdnjs api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

GET

/libraries

Browse and search libraries

GET

/libraries/{library}

Get a specific library

GET

/libraries/{library}/{version}

Get a specific library version

GET

/whitelist

Get file extension whitelist

GET

/stats

Get CDN statistics

GET

/libraries

Browse and search libraries

GET

/libraries/{library}

Get a specific library

GET

/libraries/{library}/{version}

Get a specific library version

GET

/whitelist

Get file extension whitelist

GET

/stats

Get CDN statistics

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

The cdnjs API needs no credential, so there is nothing to store, and no key ever enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'look up a JavaScript library version' or 'get file metadata for a library', and Jentic returns the matching cdnjs operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

Time to first call

FAQs

Specific to using cdnjs API through Jentic.

Why is there no official OpenAPI spec for the cdnjs API?

cdnjs publishes a documentation site but not a structured OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call cdnjs API via structured tooling. It is validated against the live API and kept up to date. Get started with Jentic One, the self-hosted execution layer.

What authentication does the cdnjs API use?

The cdnjs API is open and requires no authentication - the spec declares no security schemes. Through Jentic, calls are still routed via a single execution path so request volume can be tracked and fair-use limits applied.

Can I get SRI hashes for library files?

Yes. GET /libraries/{library}/{version} returns the file list for that version, with each entry including its sri field. You can paste the hash directly into a script or link tag's integrity attribute.

What are the rate limits for the cdnjs API?

cdnjs does not publish a hard rate limit. The service is operated as free public infrastructure by Cloudflare and applies fair-use throttling at the edge - keep traffic reasonable and back off on 429s.

How do I look up a library version through Jentic?

Search Jentic for 'look up a cdnjs library version', load the schema for GET /libraries/{library}, and execute with the library name. The response includes every published version and the latest pointer.

Is the cdnjs API free?

Yes. cdnjs is a free public CDN and its API is also free, with no commercial tier.

Can I limit what my agent is allowed to do with the cdnjs API?

Yes. Because you run Jentic One yourself, your own rules decide which cdnjs operations the agent may call, and the API is read-only over the public catalogue, so it can only browse and look up libraries, not change anything. Since cdnjs puts the library name in the URL path for operations like GET /libraries/{library}/{version}, you can write a rule that pins the agent to lookups for a single library or restricts it to specific endpoints such as /libraries, /whitelist, or /stats. The cdnjs API needs no credential, so there is nothing to store and no key ever enters the agent's context.