CustomJS Overview
CustomJS is a versatile platform designed to supercharge your no-code projects by allowing you to integrate custom logic using JavaScript. It serves as the missing toolset for automation enthusiasts and developers who find themselves constrained by the native limitations of platforms like Make.com, Zapier, and Hubspot. With CustomJS, you can execute JavaScript code, leverage the vast ecosystem of NPM modules, generate dynamic PDFs, capture website screenshots, and much more, all within a seamless, serverless environment.
The core philosophy of CustomJS is to empower users to build more sophisticated and tailored automations without the overhead of managing their own backend infrastructure. Whether you need to perform complex data transformations, interact with an unsupported API, or create custom documents on the fly, CustomJS provides the necessary tools to extend the capabilities of your favorite no-code applications.
How to use CustomJS
Getting started with CustomJS is straightforward and designed for quick integration into your existing workflows:
- Sign Up & Connect: Create an account on the CustomJS platform. Then, connect it to your automation tool of choice, such as Make.com, by adding the official CustomJS app.
- Choose a Module: Within your automation workflow (e.g., a Make.com scenario), you can select a CustomJS module. For quick, one-off scripts, use the "Execute inline JavaScript" module. For more complex or reusable logic, it's better to store the function in your CustomJS dashboard and call it using the "Execute a Stored Function" module.
- Write Your Code: You can write or paste your JavaScript code directly into the module. This is where the power of CustomJS shines—you can use `require()` to import and use any public NPM module, opening up endless possibilities.
- Manage Functions: In the CustomJS dashboard, you can create, edit, and manage a library of your JavaScript functions. This promotes code reusability and keeps your automation scenarios clean and organized.
- Integrate via API: For applications without a native integration, every stored function in CustomJS can be exposed as a secure API endpoint, allowing you to call your custom logic from anywhere.
- Pass Data: Your automation platform can pass data into your CustomJS script as input. The script processes this data and returns an output, which can then be used in subsequent steps of your workflow.
Core Features of CustomJS
- Advanced JavaScript Execution: Run server-side JavaScript code with full support for ES6+ syntax and the ability to import and use any package from the NPM registry.
- Seamless No-Code Integration: Offers native modules for leading automation platforms like Make.com and Zapier, ensuring a smooth and intuitive integration experience.
- Dynamic PDF Generation: Easily convert HTML and CSS into professional, high-quality PDF documents. This is perfect for generating invoices, reports, certificates, or any other custom document.
- Website Screenshot & Image Creation: Programmatically capture full-page or partial screenshots of any website or generate PNG images from HTML content.
- API as a Service: Turn any of your stored JavaScript functions into a secure, callable API endpoint. This allows CustomJS to act as a lightweight, serverless backend for your projects.
- Reusable Function Library: Store, manage, and version your most-used JavaScript functions in a centralized dashboard, making them easy to reuse across different workflows and projects.
- Powerful Templating Engine: Utilizes the Nunjucks templating engine, allowing you to easily inject dynamic data into HTML templates before generating PDFs or images.
Use Cases for CustomJS
CustomJS unlocks a wide range of advanced automation possibilities:
- Automated Invoicing: Fetch customer and order data from an e-commerce platform or CRM, populate an HTML invoice template with the data, and use CustomJS to generate a PDF invoice that is then automatically emailed to the client.
- Customized Reporting: Aggregate data from multiple sources like Google Sheets and Airtable, perform complex calculations or data analysis using JavaScript, and generate a weekly performance report as a PDF.
- AI-Powered Content Creation: Create a workflow where a new entry in a CRM triggers a CustomJS function. The function calls the ChatGPT API with a custom prompt and dynamic data to generate a personalized sales email, which is then saved as a draft.
- Web Scraping and Monitoring: Set up a scheduled automation that uses CustomJS to scrape data from a supplier's website or take periodic screenshots of a competitor's pricing page to monitor changes.
- Custom API Gateway: Build a simple API endpoint that receives a request, fetches and combines data from several different APIs, transforms the data into a unified format, and returns a single, clean JSON response.
Advantages of CustomJS
Using CustomJS provides several key benefits:
- Extend No-Code Capabilities: Break free from the built-in limitations of no-code platforms and build the exact logic your project requires.
- Cost-Effective Solution: Significantly cheaper and simpler than setting up, managing, and scaling your own server or using multiple dedicated API services for tasks like PDF generation.
- Increased Productivity: Centralize your custom scripts, making them reusable and easy to manage. This saves development time and reduces redundancy in your workflows.
- Serverless and Hassle-Free: The platform handles all the backend infrastructure, including security, scaling, and maintenance, so you can focus solely on your code and workflows.
- Flexibility and Power: The ability to use any NPM module gives you access to a massive library of pre-built functionality, from date manipulation with Moment.js to complex data scraping with Cheerio.
Pricing and Plans
CustomJS offers a freemium model with scalable plans suitable for different levels of usage:
- Free Plan: Includes 1,000 operations per month and allows for up to 10 stored functions, perfect for personal projects and testing.
- Basic Plan: Priced at $9/month, this plan offers 10,000 operations per month and unlimited stored functions, ideal for small businesses and professionals.
- Pro Plan: For $29/month, you get 50,000 operations per month and priority support, designed for heavier usage and business-critical automations.
- Business Plan: Offers custom pricing for high-volume needs, providing a custom number of operations and dedicated support for enterprise clients.
Traffic
Latest traffic
Status
Monthly traffic trend
- 2025-9: 16.8K
- 2026-1: 17.6K
- 2026-2: 13.4K
- 2026-3: 21.9K
- 2026-4: 20.2K
- 2026-5: 19.0K
Geography
Top 5 countries / regions
- 🇺🇸United States46.2%
- 🇮🇳India18.8%
- 🇮🇩Indonesia15.1%
- 🇵🇰Pakistan10.0%
- 🇧🇷Brazil9.9%
Top keywords
| Keyword | Cost per click |
|---|---|
| custom js | $0.00 |
| html to pdf | $0.26 |
| invoice generator online html | $0.00 |
| typescript fetch called from power automate | $0.00 |
| workflows n8n product knowledge dari pdf | $0.00 |
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