Code Block

A syntax-highlighted code block with copy functionality and language support.

example.tsx

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

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

tsx

import { CodeBlock } from "@/components/ui/code-block"

export function CodeBlockDemo() {
  return (
    <CodeBlock
      language="tsx"
      filename="example.tsx"
      code={`import { Button } from "@/components/ui/button"

export function Example() {
  return <Button>Click me</Button>
}`}
    />
  )
}

Installation

CLI

bash

npx fivui add code-block

Manual

Copy and paste the following code into your project.

bash

npm install prism-react-renderer lucide-react

components/ui/code-block.tsx

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"use client"

import * as React from "react"
import { Check, Copy, FileText, Terminal } from "lucide-react"
import { Highlight, themes } from "prism-react-renderer"
import { cva, type VariantProps } from "class-variance-authority"

import { cn } from "@/lib/utils"
import { Button } from "@/components/ui/button"

const codeBlockVariants = cva(
  "relative overflow-hidden rounded-lg border bg-muted/50",
  {
    variants: {
      variant: {
        default: "border-border",
        ghost: "border-transparent bg-transparent",
      },
    },
    defaultVariants: {
      variant: "default",
    },
  }
)

interface CodeBlockProps
  extends React.HTMLAttributes<HTMLDivElement>,
    VariantProps<typeof codeBlockVariants> {
  code: string
  language?: string
  filename?: string
  showLineNumbers?: boolean
  showCopy?: boolean
  maxHeight?: string
  theme?: "light" | "dark"
}

// Language icons mapping
const languageIcons: Record<string, React.ReactNode> = {
  javascript: <FileText className="h-4 w-4 text-yellow-500" />,
  typescript: <FileText className="h-4 w-4 text-blue-500" />,
  jsx: <FileText className="h-4 w-4 text-cyan-500" />,
  tsx: <FileText className="h-4 w-4 text-blue-600" />,
  python: <FileText className="h-4 w-4 text-green-500" />,
  bash: <Terminal className="h-4 w-4 text-gray-500" />,
  shell: <Terminal className="h-4 w-4 text-gray-500" />,
  json: <FileText className="h-4 w-4 text-orange-500" />,
  css: <FileText className="h-4 w-4 text-purple-500" />,
  html: <FileText className="h-4 w-4 text-red-500" />,
  sql: <FileText className="h-4 w-4 text-blue-400" />,
  yaml: <FileText className="h-4 w-4 text-red-400" />,
  xml: <FileText className="h-4 w-4 text-orange-400" />,
  default: <FileText className="h-4 w-4 text-muted-foreground" />,
}

const CodeBlock = React.forwardRef<HTMLDivElement, CodeBlockProps>(
  ({
    className,
    variant,
    code,
    language = "text",
    filename,
    showLineNumbers = false,
    showCopy = true,
    maxHeight = "400px",
    theme = "dark",
    ...props
  }, ref) => {
    const [copied, setCopied] = React.useState(false)

    const copyToClipboard = async () => {
      try {
        await navigator.clipboard.writeText(code)
        setCopied(true)
        setTimeout(() => setCopied(false), 2000)
      } catch (err) {
        console.error("Failed to copy code:", err)
      }
    }

    const languageIcon = languageIcons[language.toLowerCase()] || languageIcons.default

    return (
      <div
        ref={ref}
        className={cn(codeBlockVariants({ variant, className }))}
        {...props}
      >
        {/* Header */}
        {(filename || language || showCopy) && (
          <div className="flex items-center justify-between border-b bg-muted/30 px-4 py-2">
            <div className="flex items-center gap-2">
              {languageIcon}
              {filename && (
                <span className="text-sm font-medium text-foreground">
                  {filename}
                </span>
              )}
              {!filename && language && language !== "text" && (
                <span className="text-sm text-muted-foreground">
                  {language}
                </span>
              )}
            </div>
            {showCopy && (
              <Button
                variant="ghost"
                size="sm"
                className="h-8 w-8 p-0"
                onClick={copyToClipboard}
              >
                {copied ? (
                  <Check className="h-4 w-4" />
                ) : (
                  <Copy className="h-4 w-4" />
                )}
                <span className="sr-only">Copy code</span>
              </Button>
            )}
          </div>
        )}

        {/* Code Content */}
        <div className="relative">
          <Highlight
            theme={theme === "dark" ? themes.vsDark : themes.vsLight}
            code={code.trim()}
            language={language as any}
          >
            {({ className: highlightClassName, style, tokens, getLineProps, getTokenProps }) => (
              <pre
                className={cn(
                  "overflow-auto p-4 text-sm",
                  highlightClassName
                )}
                style={{ 
                  ...style, 
                  maxHeight,
                  backgroundColor: 'transparent'
                }}
              >
                <code className="relative block">
                  {showLineNumbers ? (
                    <div className="flex">
                      {/* Line Numbers */}
                      <div className="mr-4 select-none border-r pr-4 text-muted-foreground">
                        {tokens.map((_, index) => (
                          <div key={index} className="text-right leading-6">
                            {index + 1}
                          </div>
                        ))}
                      </div>
                      {/* Code Lines */}
                      <div className="flex-1">
                        {tokens.map((line, i) => (
                          <div key={i} {...getLineProps({ line })} className="leading-6">
                            {line.map((token, key) => (
                              <span key={key} {...getTokenProps({ token })} />
                            ))}
                          </div>
                        ))}
                      </div>
                    </div>
                  ) : (
                    tokens.map((line, i) => (
                      <div key={i} {...getLineProps({ line })} className="leading-6">
                        {line.map((token, key) => (
                          <span key={key} {...getTokenProps({ token })} />
                        ))}
                      </div>
                    ))
                  )}
                </code>
              </pre>
            )}
          </Highlight>
        </div>
      </div>
    )
  }
)
CodeBlock.displayName = "CodeBlock"

export { CodeBlock, codeBlockVariants }

Usage

tsx

import { CodeBlock } from "@/components/ui/code-block"

tsx

<CodeBlock
  language="tsx"
  code={`console.log("Hello, World!")`}
/>

Examples

Basic

javascript

function greet(name) {
  return `Hello, ${name}!`;
}

console.log(greet("World"));

tsx

<CodeBlock
  language="javascript"
  code={`function greet(name) {
  return \`Hello, \${name}!\`;
}

console.log(greet("World"));`}
/>

With Filename

components/ui/button.tsx

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

export function MyButton() {
  return <Button variant="outline">Click me</Button>
}

tsx

<CodeBlock
  language="tsx"
  filename="components/ui/button.tsx"
  code={`import { Button } from "@/components/ui/button"

export function MyButton() {
  return <Button variant="outline">Click me</Button>
}`}
/>

With Line Numbers

app.py

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def fibonacci(n):
    if n <= 1:
        return n
    return fibonacci(n-1) + fibonacci(n-2)

# Generate first 10 fibonacci numbers
for i in range(10):
    print(f"F({i}) = {fibonacci(i)}")

tsx

<CodeBlock
  language="python"
  filename="app.py"
  showLineNumbers
  code={`def fibonacci(n):
    if n <= 1:
        return n
    return fibonacci(n-1) + fibonacci(n-2)

# Generate first 10 fibonacci numbers
for i in range(10):
    print(f"F({i}) = {fibonacci(i)}")`}
/>

Ghost Variant

bash

npm install @radix-ui/react-slot
npm install class-variance-authority
npm install clsx tailwind-merge

tsx

<CodeBlock
  variant="ghost"
  language="bash"
  code={`npm install @radix-ui/react-slot
npm install class-variance-authority
npm install clsx tailwind-merge`}
/>

Without Copy Button

package.json

{
  "name": "my-app",
  "version": "1.0.0",
  "dependencies": {
    "react": "^18.0.0",
    "next": "^14.0.0"
  }
}

tsx

<CodeBlock
  language="json"
  filename="package.json"
  showCopy={false}
  code={`{
  "name": "my-app",
  "version": "1.0.0",
  "dependencies": {
    "react": "^18.0.0",
    "next": "^14.0.0"
  }
}`}
/>

Custom Max Height

styles.css

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/* Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  color: #333;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #2563eb;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: #6b7280;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover {
  color: #2563eb;
}

tsx

<CodeBlock
  language="css"
  filename="styles.css"
  maxHeight="200px"
  showLineNumbers
  code={`/* Long CSS content... */`}
/>

Language Support

The CodeBlock component supports syntax highlighting for many languages:

query.sql

SELECT users.name, COUNT(orders.id) as order_count
FROM users
LEFT JOIN orders ON users.id = orders.user_id
WHERE users.created_at > '2024-01-01'
GROUP BY users.id, users.name
ORDER BY order_count DESC;

docker-compose.yml

version: '3.8'
services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production
    volumes:
      - ./src:/app/src
    depends_on:
      - db
  db:
    image: postgres:15
    environment:
      POSTGRES_DB: myapp
      POSTGRES_PASSWORD: secret

API Reference

Prop	Type	Default	Description
`code`	`string`	-	The code content to display
`language`	`string`	`"text"`	Programming language for syntax highlighting
`filename`	`string`	-	Optional filename to display in header
`showLineNumbers`	`boolean`	`false`	Whether to show line numbers
`showCopy`	`boolean`	`true`	Whether to show copy button
`maxHeight`	`string`	`"400px"`	Maximum height of the code block
`variant`	`"default" \| "ghost"`	`"default"`	Visual variant of the code block
`theme`	`"light" \| "dark"`	`"dark"`	Syntax highlighting theme

CodeBlock also accepts all standard HTML div attributes. Built with prism-react-renderer for syntax highlighting.

View Prism Docs