Netlify Functions for Dividend Calculator

✅ Ready to Deploy!
Your Polygon API key is pre-configured: CmtxQCorT6YemvATCf70pDlRRxQJVp6I

📋 Quick Deployment Steps

Create folder structure:

netlify/
└── functions/
    ├── stock-data.js
    ├── stock-price.js
    ├── chart-data.js
    └── dividends.js

Copy each function below into its respective .js file
Deploy to Netlify: Drag folder to netlify.com
Get URLs: Your functions will be at https://your-site.netlify.app/.netlify/functions/
Update calculator: Replace BACKEND_API_URL and set USE_BACKEND = true

🔑 Your Polygon API Key: CmtxQCorT6YemvATCf70pDlRRxQJVp6I

📄 stock-data.js

exports.handler = async (event, context) => {
  const { symbol } = event.queryStringParameters;
  const POLYGON_API_KEY = 'CmtxQCorT6YemvATCf70pDlRRxQJVp6I';
  
  // Handle CORS preflight
  if (event.httpMethod === 'OPTIONS') {
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
      },
      body: '',
    };
  }
  
  if (!symbol) {
    return {
      statusCode: 400,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ error: 'Symbol parameter is required' }),
    };
  }
  
  try {
    const response = await fetch(
      `https://api.polygon.io/v3/reference/tickers/${symbol}?apikey=${POLYGON_API_KEY}`
    );
    
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    
    const data = await response.json();
    
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(data),
    };
  } catch (error) {
    console.error('Error fetching stock data:', error);
    return {
      statusCode: 500,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ 
        error: 'Failed to fetch stock data',
        message: error.message 
      }),
    };
  }
};

💰 stock-price.js

exports.handler = async (event, context) => {
  const { symbol } = event.queryStringParameters;
  const POLYGON_API_KEY = 'CmtxQCorT6YemvATCf70pDlRRxQJVp6I';
  
  // Handle CORS preflight
  if (event.httpMethod === 'OPTIONS') {
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
      },
      body: '',
    };
  }
  
  if (!symbol) {
    return {
      statusCode: 400,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ error: 'Symbol parameter is required' }),
    };
  }
  
  try {
    const response = await fetch(
      `https://api.polygon.io/v2/aggs/ticker/${symbol}/prev?adjusted=true&apikey=${POLYGON_API_KEY}`
    );
    
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    
    const data = await response.json();
    
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(data),
    };
  } catch (error) {
    console.error('Error fetching stock price:', error);
    return {
      statusCode: 500,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ 
        error: 'Failed to fetch stock price',
        message: error.message 
      }),
    };
  }
};

📈 chart-data.js

exports.handler = async (event, context) => {
  const { symbol, timespan, from, to } = event.queryStringParameters;
  const POLYGON_API_KEY = 'CmtxQCorT6YemvATCf70pDlRRxQJVp6I';
  
  // Handle CORS preflight
  if (event.httpMethod === 'OPTIONS') {
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
      },
      body: '',
    };
  }
  
  if (!symbol || !timespan || !from || !to) {
    return {
      statusCode: 400,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ 
        error: 'Missing required parameters: symbol, timespan, from, to' 
      }),
    };
  }
  
  try {
    const response = await fetch(
      `https://api.polygon.io/v2/aggs/ticker/${symbol}/range/1/${timespan}/${from}/${to}?adjusted=true&sort=asc&apikey=${POLYGON_API_KEY}`
    );
    
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    
    const data = await response.json();
    
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(data),
    };
  } catch (error) {
    console.error('Error fetching chart data:', error);
    return {
      statusCode: 500,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ 
        error: 'Failed to fetch chart data',
        message: error.message 
      }),
    };
  }
};

💎 dividends.js (Bonus Feature)

exports.handler = async (event, context) => {
  const { symbol } = event.queryStringParameters;
  const POLYGON_API_KEY = 'CmtxQCorT6YemvATCf70pDlRRxQJVp6I';
  
  // Handle CORS preflight
  if (event.httpMethod === 'OPTIONS') {
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
      },
      body: '',
    };
  }
  
  if (!symbol) {
    return {
      statusCode: 400,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ error: 'Symbol parameter is required' }),
    };
  }
  
  try {
    // Get dividend data from Polygon
    const response = await fetch(
      `https://api.polygon.io/v3/reference/dividends?ticker=${symbol}&limit=10&apikey=${POLYGON_API_KEY}`
    );
    
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    
    const data = await response.json();
    
    return {
      statusCode: 200,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(data),
    };
  } catch (error) {
    console.error('Error fetching dividend data:', error);
    return {
      statusCode: 500,
      headers: {
        'Access-Control-Allow-Origin': '*',
      },
      body: JSON.stringify({ 
        error: 'Failed to fetch dividend data',
        message: error.message 
      }),
    };
  }
};

🎯 What These Functions Do

stock-data.js: Gets company info and market cap
stock-price.js: Gets current/previous day stock prices
chart-data.js: Gets historical data for charts
dividends.js: Gets dividend payment history

⚠️ Important: After deploying, update your dividend calculator's BACKEND_API_URL variable to point to your Netlify functions URL, and set USE_BACKEND = true

🔗 Next Steps

Deploy these functions to Netlify
Test your endpoints at https://your-site.netlify.app/.netlify/functions/stock-data?symbol=AAPL
Update your dividend calculator with the new backend URL
Enjoy real-time stock data for your retiree users! 🎉

🚀 Netlify Functions for Dividend Calculator

📋 Quick Deployment Steps

🎯 What These Functions Do

🔗 Next Steps