CustomJS

Most form tools make you pick between drag-and-drop simplicity and doing anything real with the submissions. CustomJS refuses that trade. You get a headless form editor that routes responses to Make.com, n8n, or any HTTP endpoint, plus a JavaScript runtime and a PDF generator you can call from a single API. Three products, one billing line.

What CustomJS actually does

It stitches three products together: form submissions, a JavaScript sandbox with full NPM support, and a PDF and screenshot renderer. Every piece is API-first, so you can use one on its own or chain them into a single workflow that ends at your automation platform.

• Build headless forms with a drag-and-drop editor, no backend required

• Route submissions to Make.com, n8n, Airtable, Notion, or any HTTP API

• Forward inbound emails to a webhook so you can trigger automations without polling

• Convert HTML to pixel-perfect PDFs with Google Fonts and pagination controls

• Run JavaScript with full NPM support and return text, JSON, PNG, or PDF over REST

• Capture any URL as a screenshot, with automation commands to click, scroll, and crop first

The through-line: every capability is a webhook call. If your stack already speaks HTTP, CustomJS speaks it too.

The features that matter

Beyond the capabilities list, four things do most of the day-to-day work:

• Headless form endpoints — drag-and-drop builder, hosted pages, and custom-domain support so forms live on your URL.

• Mail hooks — forward inbound email straight to a webhook and skip polling loops.

• HTML-to-PDF renderer — turn any template into a paginated PDF with Google Fonts embedded.

• Sandboxed JavaScript — REST or webhook-triggered scripts with full NPM access.

How it fits in your stack

CustomJS positions itself alongside Airtable and Notion for the "collect data and act on it" job. It isn't trying to replace either — it handles the parts those tools push you to duct-tape together: a real form endpoint, a scripting layer, and a document renderer, all behind one API. If you already run automations on Make.com or n8n and keep hitting the "we need a small script here" wall, this is what you bolt on next.

Who it's built for

Automation-heavy operators who already run a workflow tool and want a scripting endpoint they don't have to host themselves. Small agencies and solo builders who'd rather pay once for a JS sandbox than spin up a Lambda every time a client asks for a generated PDF. If your team has a Notion board of "we should build a form for this" that never ships because a real endpoint means another server, this is the shortcut.

If forms, custom scripts, and document generation currently live in three separate tabs of your automation build, CustomJS is worth a serious look — Tier 1 starts at $69 with 100 requests per day and nine forms.