Introduction to Cascadia

Cascadia is a powerful and versatile API framework designed to simplify the development of web applications. In this guide, we will introduce the basic concepts of Cascadia and explore its various APIs with practical code snippets. By the end, you will have a comprehensive understanding of how to leverage Cascadia in your own projects.

Setting Up Cascadia

Before diving into the APIs, let’s quickly set up a Cascadia project:

  
  npm install cascadia
  

Basic API Examples

Here are some basic API examples to get you started:

1. Creating a Server

  
  const cascadia = require('cascadia');
  const app = cascadia();

  app.get('/', (req, res) => {
    res.send('Hello, World!');
  });

  app.listen(3000, () => {
    console.log('Server is running on port 3000');
  });
  

2. Middleware Implementation

  
  app.use((req, res, next) => {
    console.log('Request Time: ', Date.now());
    next();
  });
  

3. Route Handling

  
  app.get('/api/data', (req, res) => {
    res.json({ message: 'This is some data' });
  });
  

4. Error Handling

  
  app.use((err, req, res, next) => {
    console.error(err.stack);
    res.status(500).send('Something broke!');
  });
  

Advanced API Examples

Now, let’s delve into some advanced APIs:

1. Using a Configuration File

  
  const config = require('./config.json');
  const app = cascadia({ config });

  app.listen(config.port, () => {
    console.log(`Server is running on port ${config.port}`);
  });
  

2. Connecting to a Database

  
  const db = require('cascadia-db');
  const app = cascadia();

  app.get('/users', async (req, res) => {
    const users = await db.query('SELECT * FROM users');
    res.json(users);
  });
  

3. Authentication Middleware

  
  const auth = require('cascadia-auth');
  const app = cascadia();

  app.use(auth({
    secret: 'mysecretkey',
    algorithms: ['HS256']
  }));

  app.get('/protected', (req, res) => {
    res.send('This is a protected route');
  });
  

Complete Application Example

Here’s a complete application example using the APIs we’ve explored so far:

  
  const cascadia = require('cascadia');
  const db = require('cascadia-db');
  const auth = require('cascadia-auth');

  const app = cascadia();

  // Middleware for logging request time
  app.use((req, res, next) => {
    console.log('Request Time: ', Date.now());
    next();
  });

  // Authentication middleware
  app.use(auth({
    secret: 'mysecretkey',
    algorithms: ['HS256']
  }));

  // Route to get user data
  app.get('/users', async (req, res) => {
    const users = await db.query('SELECT * FROM users');
    res.json(users);
  });

  // Protected route
  app.get('/protected', (req, res) => {
    res.send('This is a protected route');
  });

  // Error handling middleware
  app.use((err, req, res, next) => {
    console.error(err.stack);
    res.status(500).send('Something broke!');
  });

  app.listen(3000, () => {
    console.log('Server is running on port 3000');
  });
  

By following the above examples, you can build robust and scalable web applications using the Cascadia framework. For more information, refer to the official Cascadia documentation.

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