Netlify function example

myfunction.js

// Add your MongoDB connection string into an environment variable
const { MongoClient } = require("mongodb");

// It's common to pass arguments to 'handler' of event, context
const handler = async () => {

  // Optional MongoDB connection, collection name = "pets"
  const client = new MongoClient(process.env.CONNECTIONSTRING);
  await client.connect();
  const pets = await client.db().collection("pets").find().toArray();

  // Close connection to DB so the Function can finish:
  client.close();

  return {
    statusCode: 200,
    headers: {
      'Content-Type': 'application/json',
      'Access-Control-Allow-Origin': '*',
    },
    body: JSON.stringify(pets)
  };
};

module.exports = { handler };

NetlifyFunctions.md

Structure of a Netlify Function

1. Create a /netlify folder and inside create /functions folder, and inside create a .js file for your function
2. OPTIONAL: require MongoClient if you are using MongoDB
3. Create an async function named handler
4. OPTIONAL: Connect to the database, get your data, then close DB connection
5. Return an object with statusCode, headers (optional), and body properties