index.js

export const handler = async (event) => {
    let symbol;
    
    try {
        // Parse the body if it's a string (Function URL format)
        if (event.body && typeof event.body === 'string') {
            const parsedBody = JSON.parse(event.body);
            symbol = parsedBody.symbol;
        } else {
            // Direct invocation format
            symbol = event.symbol;
        }
    } catch (error) {
        return {
            statusCode: 400,
            body: JSON.stringify('Invalid JSON in request body.')
        };
    }

    if (!symbol) {
        return {
            statusCode: 400,
            body: JSON.stringify('Missing parameter: symbol is required.')
        };
    }

    const apiKey = 'your_alpha_vantage_api_key';
    const url = `https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol=${symbol}&apikey=${apiKey}`;

    try {
        const response = await fetch(url);
        
        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
        
        const data = await response.json();
        
        return {
            statusCode: 200,
            body: JSON.stringify(data)
        };
    } catch (error) {
        return {
            statusCode: 500,
            body: JSON.stringify('Error fetching data from Alpha Vantage API.')
        };
    }
};