CustomJS
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TL;DR
CustomJS is a serverless JavaScript platform that generates PDFs, captures screenshots, builds forms, and executes custom logic — all integrated with Make.com, n8n, and Zapier.
Key Facts
Free version: Free plan with 20 requests/day, 3 forms, 500 form responses/month, and 5 hosted pages.
Pricing
Starting at Free tier, paid from $9/mo
Additional Pricing Information
Free tier with 20 req/day. Pro at $9/mo (3K req/mo). Ultra at $29/mo (10K req/mo). Mega at $99/mo (50K req/mo).
Details
What is CustomJS?
CustomJS fills a specific gap in the no-code automation ecosystem: executing custom JavaScript, generating PDFs, and capturing screenshots within Make.com, n8n, and Zapier workflows. The 600 free calls per month make it easy to test, and the HTML-to-PDF conversion with Nunjucks templating is genuinely useful for generating invoices, reports, and certificates. The no-code form builder with webhook integration adds extra value. However, daily request limits on all plans — including paid — can be restrictive for high-volume use cases. DocRaptor and ConvertAPI offer more reliable PDF generation if that's your primary need. For no-code builders who need custom logic, PDF generation, or screenshots in their Make.com or n8n workflows, CustomJS is the most integrated option — but be aware of the daily caps before committing.
Key Features
- HTML-to-PDF Conversion — generate PDFs from HTML with Nunjucks templating
- Screenshot API — capture websites with browser automation and cropping
- No-Code Form Builder — create forms with drag-and-drop, webhook integration
- JavaScript Execution — run custom JS in Make.com, n8n, and Zapier
- PDF Merge and Compress — combine and shrink PDF files via API
- Markdown-to-PDF — convert markdown documents to formatted PDFs
- Custom Domain Hosting — host forms and pages on your own domain
- NPM Module Support — use any NPM package in your serverless functions
Who is it for?
- No-code builders using Make.com, n8n, or Zapier who need custom logic
- Small businesses generating PDFs (invoices, reports, certificates)
- Developers who want serverless JavaScript without managing infrastructure
- Teams needing form builders with automation workflow integration
Who is it NOT for?
- High-volume PDF generation needs (daily limits will be restrictive)
- Enterprise teams needing guaranteed uptime and SLA commitments
- Users who need extensive third-party validation before buying
- Anyone needing advanced PDF features like digital signatures
The Bottom Line
CustomJS is the missing piece for no-code automation — it lets you run JavaScript, generate PDFs, and capture screenshots directly in Make.com, n8n, and Zapier workflows. The free tier is generous enough to test, and the HTML-to-PDF conversion with Nunjucks templating is practical for real business use. The daily request limits on all plans are the biggest limitation — if you need high-volume PDF generation, look at DocRaptor or ConvertAPI instead. For no-code builders who need custom logic in their workflows, CustomJS is the most integrated option available.
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