Interactive Code Examples

Welcome to our comprehensive code examples library. Browse, search, and copy code snippets for common development patterns and implementations.

Features

• Smart Search: Find examples by title, description, or tags
• Multi-Filter Support: Filter by programming language, category, and difficulty level
• One-Click Copy: Copy code snippets directly to your clipboard
• Difficulty Levels: Examples categorized from beginner to advanced
• Framework Tags: Easily identify framework-specific implementations

Browse Examples

LanguageAll LanguagesJavascriptTypescriptYaml

CategoryAll CategoriesAuthenticationFormsDevops

DifficultyAll LevelsBeginnerIntermediateAdvanced

Showing 3 of 3 examples

JWT Authentication with Express

Complete JWT authentication implementation with middleware for protecting routes

javascriptexpressintermediate

jwtmiddlewaresecuritynodejs

auth-middleware.js

const jwt = require('jsonwebtoken');
const bcrypt = require('bcrypt');

// JWT Authentication middleware
const authenticateToken = (req, res, next) => {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];

  if (!token) {
    return res.status(401).json({ error: 'Access token required' });
  }

  jwt.verify(token, process.env.JWT_SECRET, (err, user) => {
    if (err) {
      return res.status(403).json({ error: 'Invalid or expired token' });
    }
    req.user = user;
    next();
  });
};

module.exports = { authenticateToken };

React Form with Validation

Form component with real-time validation, error handling, and submission

typescriptreactintermediate

formsvalidationhookstypescript

ContactForm.tsx

import React, { useState } from 'react';

interface FormData {
  name: string;
  email: string;
  message: string;
}

const ContactForm: React.FC = () => {
  const [formData, setFormData] = useState<FormData>({
    name: '',
    email: '',
    message: ''
  });

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    // Form submission logic here
  };

  return (
    <form onSubmit={handleSubmit}>
      <input
        type="text"
        name="name"
        value={formData.name}
        onChange={(e) => setFormData({...formData, name: e.target.value})}
      />
    </form>
  );
};

export default ContactForm;

Docker Compose for Development

Complete Docker Compose setup for local development with database and hot reload

yamlbeginner

dockerdevelopmentdatabase

docker-compose.yml

version: '3.8'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile.dev
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=development
      - DATABASE_URL=postgresql://postgres:password@db:5432/myapp_dev
    volumes:
      - .:/app
      - /app/node_modules
    depends_on:
      - db

  db:
    image: postgres:15-alpine
    environment:
      - POSTGRES_DB=myapp_dev
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=password
    ports:
      - "5432:5432"

Contributing Examples

Have a useful code example to share? We welcome contributions to our code examples library. Examples should be:

• Complete and functional: Include all necessary imports and dependencies
• Well-documented: Clear comments explaining key concepts
• Production-ready: Follow best practices and security guidelines
• Categorized properly: Include appropriate tags and difficulty level

Example Categories

• Authentication: JWT, OAuth, session management
• Forms: Validation, submission, error handling
• DevOps: Docker, CI/CD, deployment configurations
• Database: Queries, migrations, ORM patterns
• API: REST endpoints, GraphQL resolvers, middleware
• Frontend: React components, state management, styling
• Testing: Unit tests, integration tests, mocking

Best Practices

When using these code examples:

1. Understand before copying: Read through the code and comments to understand the implementation
2. Adapt to your context: Modify examples to fit your specific requirements and coding standards
3. Security considerations: Review security implications, especially for authentication and data handling examples
4. Dependency management: Ensure you have the required dependencies installed
5. Testing: Test thoroughly in your environment before deploying to production

Request Examples

Missing an example for a specific use case? Create an issue with the "code-example-request" label and describe:

• The technology or framework
• The specific use case or problem
• Any particular requirements or constraints
• Preferred difficulty level

Our community will help create examples that meet your needs.