custom-js

name

custom-js

description

CustomJS is an automation platform that provides JavaScript execution, PDF generation, screenshots, forms, static hosting, web scraping, and email-to-webhook tools through Make.com, n8n, and HTTP APIs, allowing teams to add custom logic and backend capabilities to no-code and AI workflows. Read and write CustomJS data through One: htmltopdf, pdf, customjsfunction, pdfpages, pdfs, pages and more, 10 actions with real parameter documentation. Use whenever the user asks to look something up in CustomJS, create or update a record there, or build code against the CustomJS API.

CustomJS through One

CustomJS is an automation platform that provides JavaScript execution, PDF generation, screenshots, forms, static hosting, web scraping, and email-to-webhook tools through Make.com, n8n, and HTTP APIs, allowing teams to add custom logic and backend capabilities to no-code and AI workflows.

One exposes CustomJS through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.

How to run an action

1. Find the action in the table below, or call search_one_platform_actions with platform custom-js if it is not listed.
2. Call get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
3. Call execute_one_action with parameters copied from that knowledge.

Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.

Before you start

Call list_one_integrations once and confirm CustomJS is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.

Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.

Before a write

Creates, updates, deletes and sends land on a real CustomJS account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.

Actions

HtmlToPdf

Action	Method	Path	Action id
HTML to PDF	POST	/html2pdf	conn_mod_def::GMa2rhUxtCA::Wr-gQASvQHayBM4mtt5UEw
Test Connection	POST	/html2pdf	conn_mod_def::GMa0rTyROug::z4_htVW6S7-uhd--tr2c-A

Pdf

Action	Method	Path	Action id
Compress PDF	POST	/{{functionId}}	conn_mod_def::GMa2rhfKujg::R1lqOcDpSEWkR2DVrgYSUg

CustomJsFunction

Action	Method	Path	Action id
PDF to PNG Using a CustomJS Function	POST	/{{functionId}}	conn_mod_def::GMa2riyPbHA::NYk87HY8TsSwSbK_XePkeQ

PdfPages

Action	Method	Path	Action id
Extract Pages from PDF Using CustomJS	POST	/{{functionId}}	conn_mod_def::GMa2ri0Q1Vg::lys_jLnSR-Wd4T7Hvuc5VA

Pdfs

Action	Method	Path	Action id
Merge PDFs	POST	/{{functionId}}	conn_mod_def::GMa2rjIteRA::7dtrkWkaQAm3C8LCBEy4iA

Pages

Action	Method	Path	Action id
Create an HTML Page	POST	/pages/page/upload-html	conn_mod_def::GMa2rpj_zLA::pJpB2GDCQv6oCCs7x-Tjrw

InvoiceGenerator

Action	Method	Path	Action id
Generate an Invoice PDF Using CustomJS Invoice Generator API	POST	/invoice-generator-api	conn_mod_def::GMa2rqcqmaA::n0PXQAJWQi-ae7OO4ck49Q

PdfToText

Action	Method	Path	Action id
PDF to Text Using CustomJS	POST	/{{functionId}}	conn_mod_def::GMa2rsqfgSA::TDzQ6gR0QziqCXvPocLYrA

CustomJsExecution

Action	Method	Path	Action id
Run JavaScript Using CustomJS	POST	/{{scriptId}}	conn_mod_def::GMa2rupk3cA::fTwpdysSSaOpFD8Nxojzrg

When a call fails

The error comes from CustomJS, not from One. A 400 or 422 means your parameters do not match the schema, so re-read the knowledge and fix the field. A 401 or 403 means the connection needs re-authorizing, which no retry will fix. A 404 means the id is not on this account. A 429 means slow down. Never retry a write more than once: the first attempt may have landed.

Full catalog: https://www.withone.ai/knowledge/custom-js

Integration knowledge by One (withone.ai), licensed under One-Knowledge-1.0. Attribution must be preserved in derivative works.