21st-Kit

A modern React UI component library designed for building beautiful, accessible, and responsive web applications.

Features

• 🎨 Modern Design: Clean, minimal, and customizable components
• 🧩 Composable: Components designed to work together seamlessly
• 📱 Responsive: Mobile-first design approach
• ♿ Accessible: Built with accessibility in mind (WCAG 2.1 compliant)
• 🌗 Themeable: Easily customize colors, spacing, and more
• 🔍 TypeScript: Full TypeScript support with comprehensive type definitions
• 🧪 Well-tested: Thoroughly tested components
• 📦 Tree-shakable: Only import what you need
• 🔄 Controlled & Uncontrolled: Support for both controlled and uncontrolled components

Installation

# npm
npm install 21st-kit

# yarn
yarn add 21st-kit

# pnpm
pnpm add 21st-kit

Quick Start

import React from 'react';
import { ThemeProvider, Button, Card, CardContent } from '21st-kit';
import '21st-kit/dist/index.css';

function App() {
  return (
    <ThemeProvider>
      <Card>
        <CardContent>
          <h2>Hello, 21st-Kit!</h2>
          <p>A modern React UI component library</p>
          <Button>Get Started</Button>
        </CardContent>
      </Card>
    </ThemeProvider>
  );
}

export default App;

Components

Basic Components

• Button: Various styles, sizes, and states
• Card: Flexible container with header, content, and footer
• Avatar: User avatars with image fallback
• Badge: Small status indicators
• Alert: Contextual feedback messages
• Progress: Progress indicators
• Tooltip: Informative text when hovering over elements

Form Components

• Input: Text input fields
• Textarea: Multi-line text input
• Select: Dropdown selection
• Checkbox: Single checkbox
• Radio: Radio button groups
• Switch: Toggle switches
• Form: Complete form system with validation states

Navigation Components

• Tabs: Tabbed interfaces with controlled and uncontrolled versions

Theme Customization

21st-Kit comes with a powerful theming system that allows you to customize the look and feel of your application.

import { ThemeProvider } from '21st-kit';

function App() {
  const customTheme = {
    colors: {
      primary: '#0070f3',
      secondary: '#7928ca',
      // Override other colors as needed
    },
    borderRadius: {
      md: '0.5rem',
      // Override other border radiuses as needed
    },
    // Override other theme values as needed
  };

  return (
    <ThemeProvider theme={customTheme}>
      {/* Your app content */}
    </ThemeProvider>
  );
}

Form Integration

21st-Kit works seamlessly with popular form libraries like React Hook Form and Formik.

React Hook Form Example

import { useForm, Controller } from 'react-hook-form';
import { Form, FormItem, FormLabel, FormControl, FormMessage, Input, Button } from '21st-kit';

function LoginForm() {
  const { control, handleSubmit, formState: { errors } } = useForm({
    defaultValues: {
      email: '',
      password: '',
    }
  });

  const onSubmit = (data) => {
    console.log(data);
  };

  return (
    <Form onSubmit={handleSubmit(onSubmit)}>
      <FormItem validationState={errors.email ? 'invalid' : 'default'}>
        <FormLabel required>Email</FormLabel>
        <FormControl>
          <Controller
            name="email"
            control={control}
            rules={{ 
              required: 'Email is required',
              pattern: { 
                value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i, 
                message: 'Invalid email address' 
              }
            }}
            render={({ field }) => (
              <Input 
                type="email" 
                placeholder="Enter your email" 
                {...field} 
              />
            )}
          />
        </FormControl>
        <FormMessage error={errors.email?.message} />
      </FormItem>
      
      {/* Password field and submit button */}
    </Form>
  );
}

Controlled vs Uncontrolled Components

Many components in 21st-Kit support both controlled and uncontrolled usage patterns.

Controlled Tabs Example

import { useState } from 'react';
import { Tabs, TabsList, TabsTrigger, TabsContent } from '21st-kit';

function ControlledTabs() {
  const [activeTab, setActiveTab] = useState('tab1');
  
  return (
    <Tabs value={activeTab} onValueChange={setActiveTab}>
      <TabsList>
        <TabsTrigger value="tab1">Tab 1</TabsTrigger>
        <TabsTrigger value="tab2">Tab 2</TabsTrigger>
      </TabsList>
      <TabsContent value="tab1">Content for Tab 1</TabsContent>
      <TabsContent value="tab2">Content for Tab 2</TabsContent>
    </Tabs>
  );
}

Uncontrolled Tabs Example

import { Tabs, TabsList, TabsTrigger, TabsContent } from '21st-kit';

function UncontrolledTabs() {
  return (
    <Tabs defaultValue="tab1">
      <TabsList>
        <TabsTrigger value="tab1">Tab 1</TabsTrigger>
        <TabsTrigger value="tab2">Tab 2</TabsTrigger>
      </TabsList>
      <TabsContent value="tab1">Content for Tab 1</TabsContent>
      <TabsContent value="tab2">Content for Tab 2</TabsContent>
    </Tabs>
  );
}

Button Variants

21st-Kit provides multiple button variants to suit different UI needs:

import { Button } from '21st-kit';

function ButtonExamples() {
  return (
    <div>
      <Button variant="primary">Primary</Button>
      <Button variant="secondary">Secondary</Button>
      <Button variant="outline">Outline</Button>
      <Button variant="text">Text</Button>
      <Button variant="ghost">Ghost</Button>
      <Button variant="link">Link</Button>
      <Button variant="danger">Danger</Button>
      <Button variant="success">Success</Button>
      <Button variant="warning">Warning</Button>
      <Button variant="info">Info</Button>
      
      {/* Icon buttons */}
      <Button size="icon" aria-label="Settings">
        <SettingsIcon />
      </Button>
      
      {/* Loading state */}
      <Button loading>Loading</Button>
      
      {/* With icons */}
      <Button leftIcon={<DownloadIcon />}>Download</Button>
      <Button rightIcon={<ArrowRightIcon />}>Next</Button>
    </div>
  );
}

Contributing

We welcome contributions! Please see our Contributing Guide for more details.

License

MIT © Bharadwaj Apittu