Fetch subscriber count from buttondown email API

button-subscriber-count.js

// fetch buttondown newsletter subscriber count from API at build time
// common file location src/_data/newsletter.js

module.exports = async function() {
  let subscribers;
  
  try {
    const response = await fetch(
      `https://api.buttondown.email/v1/subscribers`,
      {
        headers: {
          Authorization: `Token ${process.env.BUTTONDOWN_API_KEY}`,
        },
      },
    );
    
    const result = await response.json();
    
    subscribers = `${result.count.toString()}+`;
  } catch (error) {
    subscribers = 'a whole bunch of';
  }
  
  return subscribers;
};