Shadcn Ui

shadcn/ui Component Patterns

Expert guide for building accessible, customizable UI components with shadcn/ui, Radix UI, and Tailwind CSS.

스니펫 조회: 기본은 official-ui-reference.md(공식 문서 최신 덤프, blocks·chart 등 범위 넓음)를 읽고, 거기 없는 스니펫만 ui-reference.md(구버전 발췌)에서 보조 조회한다.

Table of Contents

• When to Use
• Quick Start
• Installation & Setup
• Project Configuration
• Core Components
  • Button
  • Input & Form Fields
  • Forms with Validation
  • Card
  • Dialog (Modal)
  • Select (Dropdown)
  • Sheet (Slide-over)
  • Menubar & Navigation
  • Table
  • Toast Notifications
• Advanced Patterns
• Customization
• Next.js Integration
• Best Practices
• Common Component Combinations

When to Use

• Setting up a new project with shadcn/ui
• Installing or configuring individual components
• Building forms with React Hook Form and Zod validation
• Creating accessible UI components (buttons, dialogs, dropdowns, sheets)
• Customizing component styling with Tailwind CSS
• Implementing design systems with shadcn/ui
• Building Next.js applications with TypeScript
• Creating complex layouts and data displays

Quick Start

For new projects, use the automated setup:

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# Create Next.js project with shadcn/ui
npx create-next-app@latest my-app --typescript --tailwind --eslint --app
cd my-app
npx shadcn@latest init

# Install essential components
npx shadcn@latest add button input form card dialog select

For existing projects:

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# Install dependencies
npm install tailwindcss-animate class-variance-authority clsx tailwind-merge lucide-react

# Initialize shadcn/ui
npx shadcn@latest init

What is shadcn/ui?

shadcn/ui is not a traditional component library or npm package. Instead:

• It's a collection of reusable components that you can copy into your project
• Components are yours to customize - you own the code
• Built with Radix UI primitives for accessibility
• Styled with Tailwind CSS utilities
• Includes CLI tool for easy component installation

Installation & Setup

Initial Setup

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# Initialize shadcn/ui in your project
npx shadcn@latest init

During setup, you'll configure:

• TypeScript or JavaScript
• Style (Default, New York, etc.)
• Base color theme
• CSS variables or Tailwind CSS classes
• Component installation path

Installing Individual Components

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# Install a single component
npx shadcn@latest add button

# Install multiple components
npx shadcn@latest add button input form

# Install all components
npx shadcn@latest add --all

Manual Installation

If you prefer manual setup:

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# Install dependencies for a specific component
npm install @radix-ui/react-slot

# Copy component code from ui.shadcn.com
# Place in src/components/ui/

Project Configuration

Required Dependencies

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{
  "dependencies": {
    "@radix-ui/react-accordion": "^1.1.2",
    "@radix-ui/react-alert-dialog": "^1.0.5",
    "@radix-ui/react-dialog": "^1.0.5",
    "@radix-ui/react-dropdown-menu": "^2.0.6",
    "@radix-ui/react-label": "^2.0.2",
    "@radix-ui/react-select": "^2.0.0",
    "@radix-ui/react-separator": "^1.0.3",
    "@radix-ui/react-slot": "^1.0.2",
    "@radix-ui/react-toast": "^1.1.5",
    "class-variance-authority": "^0.7.0",
    "clsx": "^2.0.0",
    "lucide-react": "^0.294.0",
    "tailwind-merge": "^2.0.0",
    "tailwindcss-animate": "^1.0.7"
  }
}

TSConfig Configuration

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{
  "compilerOptions": {
    "target": "es5",
    "lib": ["dom", "dom.iterable", "es6"],
    "allowJs": true,
    "skipLibCheck": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noEmit": true,
    "esModuleInterop": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "jsx": "preserve",
    "incremental": true,
    "plugins": [
      {
        "name": "next"
      }
    ],
    "baseUrl": ".",
    "paths": {
      "@/components/*": ["./src/components/*"],
      "@/lib/*": ["./src/lib/*"]
    }
  },
  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
  "exclude": ["node_modules"]
}

Tailwind Configuration

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// tailwind.config.js
/** @type {import('tailwindcss').Config} */
module.exports = {
  darkMode: ["class"],
  content: [
    './pages/**/*.{ts,tsx}',
    './components/**/*.{ts,tsx}',
    './app/**/*.{ts,tsx}',
    './src/**/*.{ts,tsx}',
  ],
  prefix: "",
  theme: {
    container: {
      center: true,
      padding: "2rem",
      screens: {
        "2xl": "1400px",
      },
    },
    extend: {
      colors: {
        border: "hsl(var(--border))",
        input: "hsl(var(--input))",
        ring: "hsl(var(--ring))",
        background: "hsl(var(--background))",
        foreground: "hsl(var(--foreground))",
        primary: {
          DEFAULT: "hsl(var(--primary))",
          foreground: "hsl(var(--primary-foreground))",
        },
        secondary: {
          DEFAULT: "hsl(var(--secondary))",
          foreground: "hsl(var(--secondary-foreground))",
        },
        destructive: {
          DEFAULT: "hsl(var(--destructive))",
          foreground: "hsl(var(--destructive-foreground))",
        },
        muted: {
          DEFAULT: "hsl(var(--muted))",
          foreground: "hsl(var(--muted-foreground))",
        },
        accent: {
          DEFAULT: "hsl(var(--accent))",
          foreground: "hsl(var(--accent-foreground))",
        },
        popover: {
          DEFAULT: "hsl(var(--popover))",
          foreground: "hsl(var(--popover-foreground))",
        },
        card: {
          DEFAULT: "hsl(var(--card))",
          foreground: "hsl(var(--card-foreground))",
        },
      },
      borderRadius: {
        lg: "var(--radius)",
        md: "calc(var(--radius) - 2px)",
        sm: "calc(var(--radius) - 4px)",
      },
      keyframes: {
        "accordion-down": {
          from: { height: "0" },
          to: { height: "var(--radix-accordion-content-height)" },
        },
        "accordion-up": {
          from: { height: "var(--radix-accordion-content-height)" },
          to: { height: "0" },
        },
      },
      animation: {
        "accordion-down": "accordion-down 0.2s ease-out",
        "accordion-up": "accordion-up 0.2s ease-out",
      },
    },
  },
  plugins: [require("tailwindcss-animate")],
}

CSS Variables (globals.css)

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@tailwind base;
@tailwind components;
@tailwind utilities;

@layer base {
  :root {
    --background: 0 0% 100%;
    --foreground: 222.2 84% 4.9%;
    --card: 0 0% 100%;
    --card-foreground: 222.2 84% 4.9%;
    --popover: 0 0% 100%;
    --popover-foreground: 222.2 84% 4.9%;
    --primary: 222.2 47.4% 11.2%;
    --primary-foreground: 210 40% 98%;
    --secondary: 210 40% 96.1%;
    --secondary-foreground: 222.2 47.4% 11.2%;
    --muted: 210 40% 96.1%;
    --muted-foreground: 215.4 16.3% 46.9%;
    --accent: 210 40% 96.1%;
    --accent-foreground: 222.2 47.4% 11.2%;
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 210 40% 98%;
    --border: 214.3 31.8% 91.4%;
    --input: 214.3 31.8% 91.4%;
    --ring: 222.2 84% 4.9%;
    --radius: 0.5rem;
  }

  .dark {
    --background: 222.2 84% 4.9%;
    --foreground: 210 40% 98%;
    --card: 222.2 84% 4.9%;
    --card-foreground: 210 40% 98%;
    --popover: 222.2 84% 4.9%;
    --popover-foreground: 210 40% 98%;
    --primary: 210 40% 98%;
    --primary-foreground: 222.2 47.4% 11.2%;
    --secondary: 217.2 32.6% 17.5%;
    --secondary-foreground: 210 40% 98%;
    --muted: 217.2 32.6% 17.5%;
    --muted-foreground: 215 20.2% 65.1%;
    --accent: 217.2 32.6% 17.5%;
    --accent-foreground: 210 40% 98%;
    --destructive: 0 62.8% 30.6%;
    --destructive-foreground: 210 40% 98%;
    --border: 217.2 32.6% 17.5%;
    --input: 217.2 32.6% 17.5%;
    --ring: 212.7 26.8% 83.9%;
  }
}

@layer base {
  * {
    @apply border-border;
  }
  body {
    @apply bg-background text-foreground;
  }
}

Core Components

Button Component

Installation:

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npx shadcn@latest add button

Basic usage:

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import { Button } from "@/components/ui/button";

export function ButtonDemo() {
  return <Button>Click me</Button>;
}

Button variants:

tsxCopy code
import { Button } from "@/components/ui/button";

export function ButtonVariants() {
  return (
    <div className="flex gap-4">
      <Button variant="default">Default</Button>
      <Button variant="destructive">Destructive</Button>
      <Button variant="outline">Outline</Button>
      <Button variant="secondary">Secondary</Button>
      <Button variant="ghost">Ghost</Button>
      <Button variant="link">Link</Button>
    </div>
  );
}

Button sizes:

tsxCopy code
<div className="flex gap-4 items-center">
  <Button size="default">Default</Button>
  <Button size="sm">Small</Button>
  <Button size="lg">Large</Button>
  <Button size="icon">
    <Icon className="h-4 w-4" />
  </Button>
</div>

With loading state:

tsxCopy code
import { Button } from "@/components/ui/button";
import { Loader2 } from "lucide-react";

export function ButtonLoading() {
  return (
    <Button disabled>
      <Loader2 className="mr-2 h-4 w-4 animate-spin" />
      Please wait
    </Button>
  );
}

Input & Form Fields

Input Component

Installation:

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npx shadcn@latest add input

Basic input:

tsxCopy code
import { Input } from "@/components/ui/input";

export function InputDemo() {
  return <Input type="email" placeholder="Email" />;
}

Input with label:

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import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

export function InputWithLabel() {
  return (
    <div className="grid w-full max-w-sm items-center gap-1.5">
      <Label htmlFor="email">Email</Label>
      <Input type="email" id="email" placeholder="Email" />
    </div>
  );
}

Input with button:

tsxCopy code
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";

export function InputWithButton() {
  return (
    <div className="flex w-full max-w-sm items-center gap-2">
      <Input type="email" placeholder="Email" />
      <Button type="submit" variant="outline">Subscribe</Button>
    </div>
  );
}

Forms with Validation

Installation:

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npx shadcn@latest add form

This installs React Hook Form, Zod, and form components.

Complete form example:

tsxCopy code
"use client"

import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import * as z from "zod"

import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { toast } from "@/components/ui/use-toast"

const formSchema = z.object({
  username: z.string().min(2, {
    message: "Username must be at least 2 characters.",
  }),
  email: z.string().email({
    message: "Please enter a valid email address.",
  }),
})

export function ProfileForm() {
  const form = useForm<z.infer<typeof formSchema>>({
    resolver: zodResolver(formSchema),
    defaultValues: {
      username: "",
      email: "",
    },
  })

  function onSubmit(values: z.infer<typeof formSchema>) {
    toast({
      title: "You submitted the following values:",
      description: (
        <pre className="mt-2 w-[340px] rounded-md bg-slate-950 p-4">
          <code className="text-white">{JSON.stringify(values, null, 2)}</code>
        </pre>
      ),
    })
  }

  return (
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-8">
        <FormField
          control={form.control}
          name="username"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Username</FormLabel>
              <FormControl>
                <Input placeholder="shadcn" {...field} />
              </FormControl>
              <FormDescription>
                This is your public display name.
              </FormDescription>
              <FormMessage />
            </FormItem>
          )}
        />
        
        <FormField
          control={form.control}
          name="email"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Email</FormLabel>
              <FormControl>
                <Input type="email" placeholder="you@example.com" {...field} />
              </FormControl>
              <FormMessage />
            </FormItem>
          )}
        />
        
        <Button type="submit">Submit</Button>
      </form>
    </Form>
  )
}

Card Component

Installation:

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npx shadcn@latest add card

Basic card:

tsxCopy code
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card"

export function CardDemo() {
  return (
    <Card>
      <CardHeader>
        <CardTitle>Card Title</CardTitle>
        <CardDescription>Card Description</CardDescription>
      </CardHeader>
      <CardContent>
        <p>Card Content</p>
      </CardContent>
      <CardFooter>
        <p>Card Footer</p>
      </CardFooter>
    </Card>
  )
}

Card with form:

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import { Button } from "@/components/ui/button"
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"

export function CardWithForm() {
  return (
    <Card className="w-[350px]">
      <CardHeader>
        <CardTitle>Create project</CardTitle>
        <CardDescription>Deploy your new project in one-click.</CardDescription>
      </CardHeader>
      <CardContent>
        <form>
          <div className="grid w-full items-center gap-4">
            <div className="flex flex-col space-y-1.5">
              <Label htmlFor="name">Name</Label>
              <Input id="name" placeholder="Name of your project" />
            </div>
          </div>
        </form>
      </CardContent>
      <CardFooter className="flex justify-between">
        <Button variant="outline">Cancel</Button>
        <Button>Deploy</Button>
      </CardFooter>
    </Card>
  )
}

Dialog (Modal) Component

Installation:

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npx shadcn@latest add dialog

Basic dialog:

tsxCopy code
import { Button } from "@/components/ui/button"
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog"

export function DialogDemo() {
  return (
    <Dialog>
      <DialogTrigger asChild>
        <Button variant="outline">Open Dialog</Button>
      </DialogTrigger>
      <DialogContent className="sm:max-w-[425px]">
        <DialogHeader>
          <DialogTitle>Edit profile</DialogTitle>
          <DialogDescription>
            Make changes to your profile here. Click save when you're done.
          </DialogDescription>
        </DialogHeader>
        <div className="grid gap-4 py-4">
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="name" className="text-right">
              Name
            </Label>
            <Input id="name" value="Pedro Duarte" className="col-span-3" />
          </div>
        </div>
        <DialogFooter>
          <Button type="submit">Save changes</Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  )
}

Sheet (Slide-over) Component

Installation:

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npx shadcn@latest add sheet

Basic sheet:

tsxCopy code
import { Button } from "@/components/ui/button"
import {
  Sheet,
  SheetContent,
  SheetDescription,
  SheetHeader,
  SheetTitle,
  SheetTrigger,
} from "@/components/ui/sheet"

export function SheetDemo() {
  return (
    <Sheet>
      <SheetTrigger asChild>
        <Button variant="outline">Open Sheet</Button>
      </SheetTrigger>
      <SheetContent>
        <SheetHeader>
          <SheetTitle>Edit profile</SheetTitle>
          <SheetDescription>
            Make changes to your profile here. Click save when you're done.
          </SheetDescription>
        </SheetHeader>
        <div className="grid gap-4 py-4">
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="name" className="text-right">
              Name
            </Label>
            <Input id="name" value="Pedro Duarte" className="col-span-3" />
          </div>
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="username" className="text-right">
              Username
            </Label>
            <Input id="username" value="@peduarte" className="col-span-3" />
          </div>
        </div>
      </SheetContent>
    </Sheet>
  )
}

Sheet with side placement:

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<Sheet>
  <SheetTrigger asChild>
    <Button variant="outline">Open Right Sheet</Button>
  </SheetTrigger>
  <SheetContent side="right">
    <SheetHeader>
      <SheetTitle>Settings</SheetTitle>
      <SheetDescription>
        Configure your application settings here.
      </SheetDescription>
    </SheetHeader>
    {/* Settings content */}
  </SheetContent>
</Sheet>

Menubar & Navigation

Menubar Component

Installation:

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npx shadcn@latest add menubar

Basic menubar:

tsxCopy code
import {
  Menubar,
  MenubarContent,
  MenubarItem,
  MenubarMenu,
  MenubarSeparator,
  MenubarShortcut,
  MenubarSub,
  MenubarSubContent,
  MenubarSubTrigger,
  MenubarTrigger,
} from "@/components/ui/menubar"

export function MenubarDemo() {
  return (
    <Menubar>
      <MenubarMenu>
        <MenubarTrigger>File</MenubarTrigger>
        <MenubarContent>
          <MenubarItem>
            New Tab <MenubarShortcut>⌘T</MenubarShortcut>
          </MenubarItem>
          <MenubarItem>
            New Window <MenubarShortcut>⌘N</MenubarShortcut>
          </MenubarItem>
          <MenubarSeparator />
          <MenubarItem>Share</MenubarItem>
          <MenubarSeparator />
          <MenubarItem>Print</MenubarItem>
        </MenubarContent>
      </MenubarMenu>
      <MenubarMenu>
        <MenubarTrigger>Edit</MenubarTrigger>
        <MenubarContent>
          <MenubarItem>
            Undo <MenubarShortcut>⌘Z</MenubarShortcut>
          </MenubarItem>
          <MenubarItem>
            Redo <MenubarShortcut>⌘Y</MenubarShortcut>
          </MenubarItem>
          <MenubarSeparator />
          <MenubarSub>
            <MenubarSubTrigger>Find</MenubarSubTrigger>
            <MenubarSubContent>
              <MenubarItem>Search the web</MenubarItem>
              <MenubarItem>Find...</MenubarItem>
              <MenubarItem>Find Next</MenubarItem>
              <MenubarItem>Find Previous</MenubarItem>
            </MenubarSubContent>
          </MenubarSub>
        </MenubarContent>
      </MenubarMenu>
    </Menubar>
  )
}

Select (Dropdown) Component

Installation:

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npx shadcn@latest add select

Basic select:

tsxCopy code
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"

export function SelectDemo() {
  return (
    <Select>
      <SelectTrigger className="w-[180px]">
        <SelectValue placeholder="Select a fruit" />
      </SelectTrigger>
      <SelectContent>
        <SelectItem value="apple">Apple</SelectItem>
        <SelectItem value="banana">Banana</SelectItem>
        <SelectItem value="orange">Orange</SelectItem>
      </SelectContent>
    </Select>
  )
}

Select in form:

tsxCopy code
<FormField
  control={form.control}
  name="role"
  render={({ field }) => (
    <FormItem>
      <FormLabel>Role</FormLabel>
      <Select onValueChange={field.onChange} defaultValue={field.value}>
        <FormControl>
          <SelectTrigger>
            <SelectValue placeholder="Select a role" />
          </SelectTrigger>
        </FormControl>
        <SelectContent>
          <SelectItem value="admin">Admin</SelectItem>
          <SelectItem value="user">User</SelectItem>
          <SelectItem value="guest">Guest</SelectItem>
        </SelectContent>
      </Select>
      <FormMessage />
    </FormItem>
  )}
/>

Toast Notifications

Installation:

bashCopy code
npx shadcn@latest add toast

Setup toast provider in root layout:

tsxCopy code
import { Toaster } from "@/components/ui/toaster"

export default function RootLayout({ children }) {
  return (
    <html lang="en">
      <body>
        {children}
        <Toaster />
      </body>
    </html>
  )
}

Using toast:

tsxCopy code
import { useToast } from "@/components/ui/use-toast"
import { Button } from "@/components/ui/button"

export function ToastDemo() {
  const { toast } = useToast()

  return (
    <Button
      onClick={() => {
        toast({
          title: "Scheduled: Catch up",
          description: "Friday, February 10, 2023 at 5:57 PM",
        })
      }}
    >
      Show Toast
    </Button>
  )
}

Toast variants:

tsxCopy code
// Success
toast({
  title: "Success",
  description: "Your changes have been saved.",
})

// Error
toast({
  variant: "destructive",
  title: "Error",
  description: "Something went wrong.",
})

// With action
toast({
  title: "Uh oh! Something went wrong.",
  description: "There was a problem with your request.",
  action: <ToastAction altText="Try again">Try again</ToastAction>,
})

Table Component

Installation:

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npx shadcn@latest add table

Basic table:

tsxCopy code
import {
  Table,
  TableBody,
  TableCaption,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table"

const invoices = [
  { invoice: "INV001", status: "Paid", method: "Credit Card", amount: "$250.00" },
  { invoice: "INV002", status: "Pending", method: "PayPal", amount: "$150.00" },
]

export function TableDemo() {
  return (
    <Table>
      <TableCaption>A list of your recent invoices.</TableCaption>
      <TableHeader>
        <TableRow>
          <TableHead>Invoice</TableHead>
          <TableHead>Status</TableHead>
          <TableHead>Method</TableHead>
          <TableHead className="text-right">Amount</TableHead>
        </TableRow>
      </TableHeader>
      <TableBody>
        {invoices.map((invoice) => (
          <TableRow key={invoice.invoice}>
            <TableCell className="font-medium">{invoice.invoice}</TableCell>
            <TableCell>{invoice.status}</TableCell>
            <TableCell>{invoice.method}</TableCell>
            <TableCell className="text-right">{invoice.amount}</TableCell>
          </TableRow>
        ))}
      </TableBody>
    </Table>
  )
}

Customization

Theming with CSS Variables

shadcn/ui uses CSS variables for theming. Configure in globals.css:

cssCopy code
@layer base {
  :root {
    --background: 0 0% 100%;
    --foreground: 222.2 84% 4.9%;
    --primary: 222.2 47.4% 11.2%;
    --primary-foreground: 210 40% 98%;
    --secondary: 210 40% 96.1%;
    --secondary-foreground: 222.2 47.4% 11.2%;
    --muted: 210 40% 96.1%;
    --muted-foreground: 215.4 16.3% 46.9%;
    --accent: 210 40% 96.1%;
    --accent-foreground: 222.2 47.4% 11.2%;
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 210 40% 98%;
    --border: 214.3 31.8% 91.4%;
    --input: 214.3 31.8% 91.4%;
    --ring: 222.2 84% 4.9%;
    --radius: 0.5rem;
  }

  .dark {
    --background: 222.2 84% 4.9%;
    --foreground: 210 40% 98%;
    --primary: 210 40% 98%;
    --primary-foreground: 222.2 47.4% 11.2%;
    /* ... other dark mode variables */
  }
}

Customizing Components

Since you own the code, customize directly:

tsxCopy code
// components/ui/button.tsx
import * as React from "react"
import { Slot } from "@radix-ui/react-slot"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "@/lib/utils"

const buttonVariants = cva(
  "inline-flex items-center justify-center rounded-md text-sm font-medium transition-colors",
  {
    variants: {
      variant: {
        default: "bg-primary text-primary-foreground hover:bg-primary/90",
        destructive: "bg-destructive text-destructive-foreground hover:bg-destructive/90",
        outline: "border border-input bg-background hover:bg-accent",
        // Add custom variant
        custom: "bg-gradient-to-r from-purple-500 to-pink-500 text-white",
      },
      size: {
        default: "h-10 px-4 py-2",
        sm: "h-9 rounded-md px-3",
        lg: "h-11 rounded-md px-8",
        // Add custom size
        xl: "h-14 rounded-md px-10 text-lg",
      },
    },
    defaultVariants: {
      variant: "default",
      size: "default",
    },
  }
)

export interface ButtonProps
  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
    VariantProps<typeof buttonVariants> {
  asChild?: boolean
}

const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant, size, asChild = false, ...props }, ref) => {
    const Comp = asChild ? Slot : "button"
    return (
      <Comp
        className={cn(buttonVariants({ variant, size, className }))}
        ref={ref}
        {...props}
      />
    )
  }
)
Button.displayName = "Button"

export { Button, buttonVariants }

Next.js Integration

App Router Setup

For Next.js 13+ with App Router, ensure components use "use client" directive:

tsxCopy code
// src/components/ui/button.tsx
"use client"

import * as React from "react"
import { Slot } from "@radix-ui/react-slot"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "@/lib/utils"

// ... rest of component

Layout Integration

Add the Toaster to your root layout:

tsxCopy code
// app/layout.tsx
import { Toaster } from "@/components/ui/toaster"
import "./globals.css"

export default function RootLayout({
  children,
}: {
  children: React.ReactNode
}) {
  return (
    <html lang="en" suppressHydrationWarning>
      <body className="min-h-screen bg-background font-sans antialiased">
        {children}
        <Toaster />
      </body>
    </html>
  )
}

Server Components

When using shadcn/ui components in Server Components, wrap them in a Client Component:

tsxCopy code
// app/dashboard/page.tsx
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
import { ButtonClient } from "@/components/ui/button-client"

export default function DashboardPage() {
  return (
    <div className="container mx-auto p-6">
      <Card>
        <CardHeader>
          <CardTitle>Dashboard</CardTitle>
        </CardHeader>
        <CardContent>
          <ButtonClient>Interactive Button</ButtonClient>
        </CardContent>
      </Card>
    </div>
  )
}

tsxCopy code
// src/components/ui/button-client.tsx
"use client"

import { Button } from "./button"

export function ButtonClient(props: React.ComponentProps<typeof Button>) {
  return <Button {...props} />
}

Route Handlers with Forms

Create API routes for form submissions:

tsxCopy code
// app/api/contact/route.ts
import { NextRequest, NextResponse } from "next/server"
import { z } from "zod"

const contactSchema = z.object({
  name: z.string().min(2),
  email: z.string().email(),
  message: z.string().min(10),
})

export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const validated = contactSchema.parse(body)

    // Process form data
    console.log("Form submission:", validated)

    return NextResponse.json({ success: true })
  } catch (error) {
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { errors: error.errors },
        { status: 400 }
      )
    }

    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    )
  }
}

Form with Server Action

Using Next.js 14+ Server Actions:

tsxCopy code
// app/contact/page.tsx
"use client"

import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import * as z from "zod"
import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Textarea } from "@/components/ui/textarea"
import { toast } from "@/components/ui/use-toast"

const formSchema = z.object({
  name: z.string().min(2),
  email: z.string().email(),
  message: z.string().min(10),
})

async function onSubmit(values: z.infer<typeof formSchema>) {
  try {
    const response = await fetch("/api/contact", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(values),
    })

    if (!response.ok) throw new Error("Failed to submit")

    toast({
      title: "Success!",
      description: "Your message has been sent.",
    })
  } catch (error) {
    toast({
      variant: "destructive",
      title: "Error",
      description: "Failed to send message. Please try again.",
    })
  }
}

export default function ContactPage() {
  const form = useForm<z.infer<typeof formSchema>>({
    resolver: zodResolver(formSchema),
  })

  return (
    <div className="container mx-auto max-w-2xl py-8">
      <Form {...form}>
        <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-6">
          <FormField
            control={form.control}
            name="name"
            render={({ field }) => (
              <FormItem>
                <FormLabel>Name</FormLabel>
                <FormControl>
                  <Input placeholder="Your name" {...field} />
                </FormControl>
                <FormMessage />
              </FormItem>
            )}
          />

          <FormField
            control={form.control}
            name="email"
            render={({ field }) => (
              <FormItem>
                <FormLabel>Email</FormLabel>
                <FormControl>
                  <Input type="email" placeholder="your@email.com" {...field} />
                </FormControl>
                <FormMessage />
              </FormItem>
            )}
          />

          <FormField
            control={form.control}
            name="message"
            render={({ field }) => (
              <FormItem>
                <FormLabel>Message</FormLabel>
                <FormControl>
                  <Textarea
                    placeholder="Your message..."
                    className="resize-none"
                    {...field}
                  />
                </FormControl>
                <FormMessage />
              </FormItem>
            )}
          />

          <Button type="submit" className="w-full">
            Send Message
          </Button>
        </form>
      </Form>
    </div>
  )
}