JDownloader

JDownloader provides a popular download manager application that simplifies downloading files from the internet. It supports multiple hosters, automatic extraction, captcha solving, and bandwidth management. The company offers both a free version and premium subscriptions, with a focus on user-friendly features and extensive plugin support for various services.

JDownloader is listed with 1 API on the APIs.io network. Tagged areas include Company, Download-Manager, File-Transfer, Java, and Freemium.

JDownloader’s developer surface includes support, engineering blog, and 8 more developer resources.

🌐 Visit website📡 Profile data on GitHub
13.2/100 emerging Agent 6/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
1 API
CompanyDownload-ManagerFile-TransferJavaFreemium

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 13.2/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 1.2 / 17
Access Clarity 3.6 / 17
Operational Transparency 1.2 / 11
Contract Governance 0.0 / 10
Discoverability 4.7 / 9
Regulatory Posture 2.9 / 15
Agent readiness — 6/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Pagination 5 / 5
Distinct Operations 3 / 3
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Show this score on your site. Kin Score badge preview for JDownloader It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/jdownloader/"><img src="https://apis.io/badge/jdownloader/card.svg" alt="JDownloader on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
  • Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
  • Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
11 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/jdownloader/apis.yml: open an issue on github.com/api-evangelist/jdownloader to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

JDownloader API

The JDownloader service provides a download manager with a web interface and API endpoints for managing downloads, plugins, and account information. Documentation is available o...

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Jdownloader Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Jdownloader Vulnerability Disclosure

no policy recorded

SECURITY

Resources

Access & Security 3

Authentication, authorization, and security posture

Security
Security
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 3

The organization behind the API

Newsroom
Newsroom
 Blog
Blog
 Website
Website

Other 1

Properties that don't map to a standard resource type

Hosts
Hosts

Source (apis.yml)

apis.yml Raw ↑ 
aid: jdownloader
name: JDownloader
description: JDownloader provides a popular download manager application that simplifies downloading files from the internet.
  It supports multiple hosters, automatic extraction, captcha solving, and bandwidth management. The company offers both a
  free version and premium subscriptions, with a focus on user-friendly features and extensive plugin support for various
  services.
url: https://artifacts.apis.io/jdownloader/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
tags:
- Company
- Download-Manager
- File-Transfer
- Java
- Freemium
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Security
  url: security/jdownloader-vulnerability-disclosure.yml
- type: Hosts
  url: hosts/jdownloader-hosts.yml
- type: TermsOfService
  url: https://my.jdownloader.org/legal/terms.html
- type: Support
  url: https://support.jdownloader.org/en
- type: PrivacyPolicy
  url: https://support.jdownloader.org/en/knowledgebase/article/privacy
- type: Newsroom
  url: https://jdownloader.org/news/index
- type: Blog
  url: https://jdownloader.org/news/blog/dlc-limit
- type: VulnerabilityDisclosure
  url: security/jdownloader-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/jdownloader-domain-security.yml
- type: Website
  url: https://jdownloader.org/
apis:
- name: JDownloader API
  description: The JDownloader service provides a download manager with a web interface and API endpoints for managing downloads,
    plugins, and account information. Documentation is available on the website but no machine‑readable contract was found.
  humanURL: https://jdownloader.org/
  aid: jdownloader:jdownloader-api
x-submission-probe: 200, 2026-10-26
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Documentation pages exist but no OpenAPI, AsyncAPI, GraphQL, gRPC, or WSDL contracts were found despite probing
    known hosts.
  evidence:
  - url: https://jdownloader.org/
    status: 200
  checked: '2026-10-28'
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 9
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

JDownloader API — frequently asked questions

Does JDownloader have an API?

Yes. APIs.io lists 1 API from JDownloader, including JDownloader API.

Is the JDownloader API ready for AI agents?

JDownloader has a Kin Score of 13.2 out of 100 (emerging) and an Agent Readiness score of 6.0 (agent-aware), scored by API Evangelist on 2026-10-31.

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