FormLabs: Building a Drag-and-Drop Form Builder with Zero Dependencies
How I created a visual form builder using HTML5 Drag and Drop API with zero external dependencies, shipping clean HTML and React code in one click.
Why Another Form Builder?
I was building client projects and spending 2-3 hours on every form. Hand-coding fields, styling them, managing state, adding validation — it was killing productivity. Existing form builders were either too basic or locked behind paywalls.
So I built FormLabs.
Zero External Dependencies
The core interaction — dragging fields onto a canvas and configuring them — uses the **HTML5 Drag and Drop API**. No react-dnd, no dnd-kit, no SortableJS. Just native browser APIs.
Why? Because dependencies break, get abandoned, and bloat your bundle. Native APIs don't.
The Architecture
11 Field Types Text, Email, Phone, Number, Date, Time, Select, Checkbox, Radio, Textarea, and File Upload. Each field type has its own configuration panel.
Real-Time Canvas Drag a field from the palette onto the canvas. See it appear instantly. Click to configure — label, placeholder, required state, validation rules. Changes preview in real-time.
One-Click Export Hit "Export" and get clean, production-ready HTML or React code. No framework lock-in, no weird wrappers. Just code you can paste into any project.
Tech Stack
- **Next.js** for the app framework
- **TypeScript** for type safety
- **Framer Motion** for animations
- **highlight.js** for code preview syntax highlighting
What I Learned
The hardest part wasn't the drag-and-drop. It was making the canvas feel responsive. When you drag a field, the canvas needs to show drop zones, highlight valid targets, and handle edge cases like dragging onto nested sections.
HTML5 DnD API has quirks — the drag image, the dataTransfer object, the event lifecycle. But once you understand it, it's powerful enough for complex interactions.
Open Source
FormLabs is open source on GitHub. If you build forms for clients, give it a try. Or fork it and make it your own.