A free headless form endpoint to receive submissions without a backend. Built for AI-generated forms and custom integrations — send JSON, we store it, trigger email notifications, and fire webhooks into Make.com or n8n.
// how it works
Grab your endpoint, paste the prompt into your AI — your form is live.
Endpoint URL
https://api.app.customjs.io/pages/form/submit/a1b2c3d4-XXXX-XXXX-XXXX-XXXXXXXXXXXXSend POST requests to this endpoint with JSON data
Copy this prompt to use with AI assistants (ChatGPT, Claude, etc.):
Please build a form with the following fields:
- Name (text input)
- Email (email input)
- Message (textarea)
Send the form data to this headless form endpoint using the example below:
curl -X POST https://api.app.customjs.io/pages/form/submit/a1b2c3d4-XXXX-XXXX-XXXX-XXXXXXXXXXXX \
-H "Content-Type: application/json" \
-d '{
"email": "[email protected]",
"name": "John Doe",
"message": "Hello, this is a test submission!",
"customField": "Any data you want"
}'Use this prompt with AI tools to automatically generate forms that submit to your headless endpoint
Focus on the benefits, not the specs.
We stay out of your way. No schemas, no "adding fields" in a dashboard. If you add a "Phone Number" field to your code, we just pick it up.
Use {{name}} or {{message}} in your replies. Our engine maps your code variables to your emails instantly.
Built-in honeypots and bot detection so your inbox stays clean while you sleep.
Want to send data to Slack or a CRM? Attach a simple script and automate your business.
Use your own CSS, Tailwind, or any framework. No theme editors, no limitations. Complete control over your frontend.
Copy your AI-generated frontend code, swap the action URL with your CustomJS endpoint, and you're live.
// resources
Guides, comparisons, and tutorials for building modern, API-first form workflows.
Concept
The API-first approach to modern web forms — why teams move off Typeform and Google Forms to a pure endpoint-based stack.
Read the guideComparison
Side-by-side headless form backend comparison: pricing, webhooks, spam protection, and DX.
Read the guideTutorial
Prompt ChatGPT or Claude for a form, paste your endpoint, and pipe submissions into Make.com or n8n. No form builder needed.
Read the guideAutomation
Automate lead routing, CRM sync, and onboarding by triggering workflows from every form submission.
Read the guideComparison
CustomJS vs Typeform, Jotform, Tally, and Fillout — what to pick when automation, not aesthetics, drives the choice.
Read the guideComparison
Which builder fits your workflow? A practical breakdown for devs, marketers, and AI-native teams.
Read the guideStop wrestling with backend code. Generate your endpoint in seconds and finish that website today.
No credit card required.