customJS

customJS is an automation platform for custom JavaScript logic, PDF generation, screenshots, and workflow assets via API-driven tools for Make.com, n8n, and custom apps.

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Overview

customJS is an automation platform for adding custom JavaScript logic, generating PDFs, capturing screenshots, and hosting simple workflow assets through API-driven tools. It is positioned for users who need capabilities beyond standard no-code actions but still want to work inside Make.com, n8n, or direct HTTP-based integrations.

The site presents separate products for JavaScript execution, HTML to PDF, and screenshot automation. The pricing page also shows forms, email hooks, hosted pages, and custom domains, suggesting the platform combines execution and lightweight web delivery in one service.

Features

JavaScript execution

Run custom JavaScript inside automation workflows when built-in formulas and visual tools are not enough. The product page highlights data transformation, API calls, and custom business logic.

HTML to PDF generation

Convert HTML or templates into PDFs through a single API call. The PDF product is positioned for invoices, reports, and other documents that need consistent rendering.

Automated screenshots

Capture website screenshots with browser automation for logins, cookie banners, and dynamic content. The screenshot product also supports clicking, typing, waiting, scrolling, and pixel-exact cropping.

Workflow integrations

Use the service through native Make.com and n8n modules, REST API access, and product-specific workflow integrations. The JavaScript execution page also references Microsoft Power Automate.

Forms, hosting, and email hooks

Host forms and pages as part of the platform. The pricing page includes hosted pages, form response limits, and email automation hooks, indicating support for lightweight web workflows.

Tiered plans

Start on a free tier and scale to paid plans that increase request volume and workspace capacity. The pricing page also shows plan-based support options and white-label availability on paid tiers.

Visual request builder

Use a visual request builder for screenshot automation. The screenshot page shows a point-and-click playground that generates curl or SDK snippets.

Use Cases

Extend Make.com or n8n workflows
Add custom JavaScript to scenarios when visual automation tools need parsing, calculations, validation, or API request shaping that is easier to express in code.
Create PDFs from HTML
Generate invoices, reports, receipts, or other documents from HTML templates and automate the conversion through API-based workflows.
Automate screenshot capture
Capture page snapshots for monitoring, archiving, social previews, or QA workflows where a browser-rendered image is needed.
Collect form submissions and route them onward
Host forms or headless data-collection pages for workflow intake, then route responses through email hooks or automation tools.
Add code to Power Automate
Use JavaScript execution inside Microsoft Power Automate flows when built-in actions do not cover the required logic or data transformation.

Pros and Cons

Pros

Supports custom JavaScript execution inside automation workflows.
Covers multiple related jobs: code execution, PDF generation, screenshots, forms, and hosting.
Offers native Make.com and n8n integrations, plus REST API access.
Includes a free tier on the pricing page with no credit card required.
Provides workflow-oriented tools such as request builders and module-based integrations.

Cons

The public pages do not spell out every technical limit or runtime detail for each product.
Some capabilities are presented across separate product pages, so buyers may need to review multiple pages to understand the full platform.

FAQ

Can I use customJS with automation tools and APIs?

Yes. The product explicitly supports Make.com, n8n, and direct HTTP API access, so it can be used inside automation workflows or from custom software.

What kinds of tasks does customJS handle?

Yes. The site shows dedicated products for JavaScript execution, HTML-to-PDF generation, and automated screenshots, all exposed through workflow integrations and REST APIs.

Is there a free plan or trial?

The pricing page shows a free tier with monthly request allowances, and paid plans that expand request volume, forms, email hooks, hosting, and support options.

Which platforms does it integrate with?

The site presents native integrations for Make.com and n8n, plus REST API access. The JavaScript execution product also mentions Microsoft Power Automate.

Are there any known limitations?

The available pages show request-based execution and output-specific products, but they do not provide exhaustive technical limits for every use case beyond the pricing allowances and timeout details shown on the pricing page.