CustomJS

CustomJS (customjs.space), operated by TechnologyCircle GmbH, is an automation platform that lets you create and integrate custom JavaScript logic into Make.com, n8n, or as an HTTP API, and use it to integrate custom logic, generate PDFs from HTML, and capture website screenshots in any software. It offers a native HTTP API with documentation, Make and n8n integrations, and an MCP server reference describing tools for AI agents.

CustomJS is listed with 2 APIs on the APIs.io network. Tagged areas include Company, JavaScript, Automation, PDF Generation, and Screenshots.

The CustomJS catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

CustomJS’s developer surface includes authentication, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 30 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

46.1/100 developing Agent 45/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

2 APIs 1 MCP Servers 3 Agent Skills

Company JavaScript Automation PDF Generation Screenshots No-Code Make n8n MCP

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 46.1/100 · developing

Contract Quality 5.6 / 21

Developer Ergonomics 9.6 / 17

Access Clarity 12.7 / 17

Operational Transparency 3.2 / 11

Contract Governance 2.2 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 45/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
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) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's Ask about this →

3 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 26.2 — up to +18.5 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →
Operational Transparency scores 28.6 — up to +9.3 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/customjs-space/apis.yml: open an issue on github.com/api-evangelist/customjs-space 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 →

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 2

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

CustomJS API

CustomJS API as documented publicly: 7 operations. Contract generated from the documentation by API Evangelist (2026-11-04); not the provider's own document.

CustomJS MCP Server

Remote Model Context Protocol server (HTTP transport) exposing CustomJS tools to AI agents, documented as HTML/Markdown to PDF, Screenshot URLs, Website Scraping and JavaScript ...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

CustomJS MCP Server

MCP SERVER

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

generate-pdf-from-html

AGENT SKILL

run-javascript

AGENT SKILL

scrape-a-website

AGENT SKILL

CustomJS API pricing

Prices published by CustomJS.

Plan	Price
Free	No credit card required
Pro	$9/ month
Ultra	$29/ month
Mega	$99/ month

Plan details, limits and sources →

Rate limits

Free execution pool: 20 Requests / day
Pro execution pool: 100 Requests / day
Ultra execution pool: 500 Requests / day

All 7 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

CustomJS Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

CustomJS Rate Limits

7 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

CustomJS

6 quoted statements, read from CustomJS's own page on 2026-11-09.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

CustomJS

1 quoted statement, read from CustomJS's own page on 2026-11-09.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

CustomJS

1 quoted statement, read from CustomJS's own page on 2026-11-09.

ELIGIBILITY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

CustomJS

1 quoted statement, read from CustomJS's own page on 2026-11-09.

LICENSE

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Customjs Space Context

8 classes · 15 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

CustomJS API Rules

39 rules · 36 error-severity 1 warn-severity 2 info-severity

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

CustomJS Api Overlay

7 actions · documentation · customjs-space-openapi-generated.yml

GENERATED

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

PostAiScraperResponse

3 properties

JSON SCHEMA

PostHtml2PdfRequest

1 properties

JSON SCHEMA

PostJs1YourApiKeyRequest

3 properties

JSON SCHEMA

PostPagesApiPageResponse

3 properties

JSON SCHEMA

PostPagesFormSubmitA1B2C3D4XxxxXxxxXxxxXxxxxxxxxxxxRequest

4 properties

JSON SCHEMA

PostPdfTemplateInv8291ProdRequest

3 properties

JSON SCHEMA

Security Posture 2

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

CustomJS Authentication

3 schemes

SECURITY

CustomJS Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

LLMsTxt

WellKnown

MCPServer

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conventions

ErrorCatalog

Conformance

Scroll for all 7

Build 4

SDKs, sample code, and the tooling you integrate with

IntegrationEdges

ToolCrosswalk

SDKs

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 6

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

UsageTerms

DataLicense

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 5

Properties that don't map to a standard resource type

Overlay

Hosts

Vendors

DataProcessing

Eligibility

Source (apis.yml)

aid: customjs-space
name: CustomJS
description: CustomJS (customjs.space), operated by TechnologyCircle GmbH, is an automation platform that lets you create
  and integrate custom JavaScript logic into Make.com, n8n, or as an HTTP API, and use it to integrate custom logic, generate
  PDFs from HTML, and capture website screenshots in any software. It offers a native HTTP API with documentation, Make and
  n8n integrations, and an MCP server reference describing tools for AI agents.
url: https://artifacts.apis.io/customjs-space/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-04 (modular-v1; was harvest)
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  probe_state: covered
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
specificationVersion: '0.20'
created: '2026-11-04'
modified: '2026-11-04'
tags:
- Company
- JavaScript
- Automation
- PDF Generation
- Screenshots
- No-Code
- Make
- n8n
- MCP
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://www.customjs.space/opengraph.png
common:
- type: IntegrationEdges
  url: integrations/customjs-space-integration-edges.yml
- type: RateLimits
  url: rate-limits/customjs-space-rate-limits.yml
- type: Plans
  url: plans/customjs-space-plans-pricing.yml
- type: Spectral
  url: rules/customjs-space-rules.yml
- type: JSONLD
  url: json-ld/customjs-space-context.jsonld
- type: Vocabulary
  url: vocabulary/customjs-space-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/customjs-space-data-model.yml
- type: Conventions
  url: conventions/customjs-space-conventions.yml
- type: Authentication
  url: authentication/customjs-space-authentication.yml
- type: ErrorCatalog
  url: errors/customjs-space-problem-types.yml
- type: Conformance
  url: conformance/customjs-space-conformance.yml
- type: Overlay
  url: overlays/customjs-space-api-overlay.yaml
- type: LLMsTxt
  url: llms/customjs-space-llms.txt
- type: ToolCrosswalk
  url: mcp/customjs-space-tool-crosswalk.yml
- type: WellKnown
  url: well-known/customjs-space-well-known.yml
- type: Hosts
  url: hosts/customjs-space-hosts.yml
- type: Vendors
  url: vendors/customjs-space-vendors.yml
- type: SDKs
  url: packages/customjs-space-packages.yml
- type: Packages
  url: packages/customjs-space-packages.yml
- type: DomainSecurity
  url: security/customjs-space-domain-security.yml
- type: Website
  url: https://www.customjs.space/
- type: Documentation
  url: https://www.customjs.space/integration/native-api/documentation
- type: APIReference
  url: https://www.customjs.space/integration/native-api/documentation
- type: GettingStarted
  url: https://www.customjs.space/integration/make/getting-started/
- type: Support
  url: https://www.customjs.space/help/
- type: Blog
  url: https://www.customjs.space/blog
- type: Pricing
  url: https://www.customjs.space/pricing
- type: SignUp
  url: https://app.customjs.space/
- type: Login
  url: https://app.customjs.space/
- type: TermsOfService
  url: https://www.customjs.space/terms-and-conditions
- type: PrivacyPolicy
  url: https://www.customjs.space/privacy-policy
- type: MCPServer
  url: https://www.customjs.space/integration/mcp
- type: UsageTerms
  url: terms/customjs-space-terms-of-service.yml
- type: DataProcessing
  url: privacy/customjs-space-privacy-policy.yml
- type: Eligibility
  url: eligibility/customjs-space-eligibility.yml
- type: DataLicense
  url: data-license/customjs-space-data-license.yml
apis:
- aid: customjs-space:customjs-space-api
  name: CustomJS API
  description: 'CustomJS API as documented publicly: 7 operations. Contract generated from the documentation by API Evangelist
    (2026-11-04); not the provider''s own document.'
  humanURL: https://www.customjs.space/integration/native-api/documentation
  baseURL: https://e.customjs.io
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/customjs-space-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/customjs-space-post-js1-your-api-key-request-schema.json
  - type: JSONSchema
    url: json-schema/customjs-space-post-pages-form-submit-a1-b2-c3-d4-xxxx-xxxx-xxxx-xxxxxxxxxxxx-request-schema.json
  - type: JSONSchema
    url: json-schema/customjs-space-post-ai-scraper-response-schema.json
  - type: JSONSchema
    url: json-schema/customjs-space-post-pdf-template-inv8291-prod-request-schema.json
  - type: JSONSchema
    url: json-schema/customjs-space-post-pages-api-page-response-schema.json
  - type: JSONSchema
    url: json-schema/customjs-space-post-html2-pdf-request-schema.json
- aid: customjs-space:customjs-mcp-server
  name: CustomJS MCP Server
  description: Remote Model Context Protocol server (HTTP transport) exposing CustomJS tools to AI agents, documented as HTML/Markdown
    to PDF, Screenshot URLs, Website Scraping and JavaScript Execution; requests carry the x-api-key header. Anonymous initialize/tools/list
    returned 401 invalid_token on 2026-11-04, so the live tool schemas are auth-gated.
  humanURL: https://www.customjs.space/integration/mcp
  baseURL: https://mcp.customjs.space/customjs/mcp
  tags:
  - MCP
  properties:
  - type: Documentation
    url: https://www.customjs.space/integration/mcp
x-coverage:
  state: covered
  reason: identity-verified
  detail: Homepage title and footer name CustomJS / TechnologyCircle GmbH; link pointers taken from site_links found on the
    provider site and confirmed 200.
  evidence:
  - url: https://www.customjs.space/
    status: 200
  - url: https://customjs.space/
    status: 200
  - url: https://www.customjs.space/opengraph.png
    status: 200
  - url: https://www.customjs.space/integration/mcp
    status: 200
x-enrichment:
  date: '2026-11-04'
  status: enriched
  artifacts_added: 37
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

CustomJS API — frequently asked questions

Does CustomJS have an API?

Yes. APIs.io lists 2 APIs from CustomJS, including CustomJS API and CustomJS MCP Server.

Is there an OpenAPI specification for the CustomJS API?

Yes. APIs.io indexes 1 OpenAPI specification for CustomJS, each linked for download from this page.

How do I authenticate with the CustomJS API?

CustomJS documents its authentication (3 schemes). The details are profiled on APIs.io as CustomJS Authentication.

How much does the CustomJS API cost?

CustomJS publishes its prices; its Free plan is No credit card required as of 2026-11-04. APIs.io lists 4 pricing plans for CustomJS, with each plan's price, limits and inclusions under Pricing on this page.

Does CustomJS have an MCP server?

Yes. APIs.io lists 1 MCP server for CustomJS.

Is the CustomJS API ready for AI agents?

CustomJS has a Kin Score of 46.1 out of 100 (developing) and an Agent Readiness score of 45.1 (agent-ready), scored by API Evangelist on 2026-11-13.

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