Install Jentic One Beta

Connect the CustomJS API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the CustomJS 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://jentic.com/install.sh?src=apis&api=%2Fapis%2Fcustomjs.space%2Fcustomjs" | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fcustomjs.space%2Fcustomjs" | 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 CustomJS API.

Convert raw HTML to a downloadable PDF via POST /html2pdf

Render Markdown to PDF in a single call via POST /markdown2pdf

Capture a full-page web screenshot of any URL via POST /screenshot

Scrape rendered HTML from a URL after JavaScript execution via POST /scraper

Execute custom JavaScript in a sandbox via POST /__js1- and return the result

GET STARTED

Start building with CustomJS API

Explore with Jentic One

View OpenAPI Document

Use Cases

Patterns agents use CustomJS API for, with concrete tasks.

★ Generate PDF receipts on demand

Render a templated HTML invoice or receipt to PDF without running a headless Chrome cluster. POST the HTML body to /html2pdf and store the resulting PDF, or attach it to an email. Works well for low-volume back-office workflows where managing Puppeteer or wkhtmltopdf is overkill.

Render the HTML invoice for order 4521 by calling POST /html2pdf and return a downloadable PDF link.

Periodic visual snapshots of a page

Capture timestamped screenshots of a marketing page or competitor pricing page on a schedule. POST /screenshot accepts a URL and returns a rendered image you can store in object storage. Pair it with a cron-style scheduler to build a visual change log.

Take a screenshot of https://example.com/pricing and store the PNG with today's date as the filename.

Lightweight scraping for SPA content

Pull rendered HTML out of a JavaScript-heavy single-page app without standing up your own browser pool. POST /scraper executes the page in a real browser and returns the post-render HTML, which a downstream parser can extract into structured records.

Scrape the rendered HTML from https://example.com/products and return the body element only.

PDF and screenshot tools for AI agents via Jentic

Give an autonomous agent a way to produce documents and visuals as part of its workflow. The agent searches Jentic for 'convert HTML to PDF', loads the schema, and executes the call - the API key is held in the vault rather than the agent's prompt.

Through Jentic, call POST /html2pdf with the HTML body of a generated report and attach the PDF to an outbound email.

Key Endpoints

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

METHOD

PATH

DESCRIPTION

POST

/html2pdf

Convert HTML to PDF

POST

/markdown2pdf

Convert Markdown to PDF

POST

/screenshot

Capture a web page screenshot

POST

/scraper

Scrape post-render HTML from a URL

POST

/__js1-

Execute custom JavaScript and return the result

POST

/pages/page/upsert-html

Create or update a hosted HTML page

POST

/html2pdf

Convert HTML to PDF

POST

/markdown2pdf

Convert Markdown to PDF

POST

/screenshot

Capture a web page screenshot

POST

/scraper

Scrape post-render HTML from a URL

POST

/__js1-

Execute custom JavaScript and return the result

POST

/pages/page/upsert-html

Create or update a hosted HTML page

Why Jentic?

What agents get from Jentic-routed access to this vendor.

Setup

Wiring the CustomJS API by hand means provisioning an X-API-Key, setting it on every header, and formatting the request bodies for its render, screenshot, and scraper routes yourself. Through Jentic you install once, import the CustomJS API from the API Directory, store the key once, and your agent calls it.

Permission scoping

CustomJS drives each job from the request body rather than a resource id in the URL path, so scope the agent to the operations it needs, such as HTML-to-PDF conversion or taking a screenshot. If you grant only the rendering operations, the scraper is not included unless you add it.

Credential isolation

Your CustomJS X-API-Key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'convert HTML to PDF' or 'take a screenshot of a webpage', and Jentic returns the matching CustomJS operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

FAQs

Specific to using CustomJS API through Jentic.

Why is there no official OpenAPI spec for CustomJS API?

CustomJS does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call CustomJS 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 CustomJS API use?

An API key passed in the X-API-Key header on every request. Through Jentic, the key is stored in the encrypted vault and injected at execution time so it never appears in agent prompts or logs.

Can I generate a PDF from HTML with CustomJS?

Yes. POST /html2pdf with the HTML body returns a rendered PDF. Use POST /markdown2pdf if your source is Markdown - CustomJS handles the conversion in one call.

Can I scrape JavaScript-rendered pages with CustomJS?

Yes. POST /scraper executes the target URL in a real browser and returns the post-render HTML, which is what you typically need for single-page apps where the source HTML is empty.

What are the rate limits for the CustomJS API?

Rate limits depend on your CustomJS plan rather than the spec. Watch for 429 responses, back off, and check your account dashboard for the per-minute and per-day quotas tied to your tier.

How do I convert HTML to PDF through Jentic?

Run pip install jentic, search for 'convert HTML to PDF', load the /html2pdf schema, and execute with your HTML body. Jentic returns the rendered PDF response without your code touching the API key.

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

Yes. Because you run Jentic One yourself, your own rules decide which CustomJS operations and credentials the agent can use, and CustomJS drives each job from the request body rather than a resource id in the path, so you scope the agent to just the operations it needs. For example, you can grant only HTML-to-PDF conversion via POST /html2pdf and screenshot capture via POST /screenshot while withholding the scraper at POST /scraper or JavaScript execution. If you allow only the rendering operations, the scraper is not included unless you add it. The stored X-API-Key is injected at execution time and never enters the agent's prompt or logs.

Customjs Space CustomJS API

Name: CustomJS API
Brand: CustomJS API
Availability: InStock

Agent-ready OpenAPI document · curated by JenticDeveloper ToolsTesting QaapiKey9 EndpointsREST

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For Agents

Convert HTML and Markdown to PDF, capture web screenshots, scrape HTML, and run arbitrary JavaScript - all over a simple HTTP API.

Use for: I need to turn this HTML into a PDF, Generate a PDF invoice from a Markdown template, Capture a screenshot of a public webpage, Scrape the rendered HTML of a single-page app

Not supported: Does not handle PDF parsing, OCR, or persistent file storage - use for HTML/Markdown rendering, screenshots, and lightweight scraping only.

Jentic publishes the only available OpenAPI specification for CustomJS API, keeping it validated and agent-ready. CustomJS is a hosted automation toolkit for HTML-to-PDF and Markdown-to-PDF conversion, full-page web screenshots, HTML scraping, on-demand JavaScript execution, and lightweight hosted HTML pages. The 9 endpoints let you turn raw HTML or a URL into rendered output without operating a headless browser yourself. Authentication is a single X-API-Key header.

Jentic One on Github View OpenAPI Document

Connect the CustomJS API to your agent

Capabilities

Start building with CustomJS API

Use Cases

Key Endpoints

Why Jentic?

Related APIs

FAQs

Customjs Space CustomJS API