mongodb - google cloud functions write example

index.js

exports.helloWorld = function helloWorld(req, res) {
  //Connect to MongoDB Atlas
  var MongoClient = require('mongodb').MongoClient;
  var uri = "mongodb://user:pass@cluster0-shard-00-00-6chsu.mongodb.net:27017,cluster-shard-00-01-6chsu.mongodb.net:27017,cluster-shard-00-02-6chsu.mongodb.net:27017/test?ssl=true&replicaSet=Cluster-shard-0&authSource=admin";
  MongoClient.connect(uri, function(err, db) {
    //check for connection errors
    if (err) res.status(400).send(err);
    
    //Read the data from the incoming request & add it to an object to insert
    var message = req.body.message;
    var myobj = { "message": message };
    
    //Try to insert the object
    db.collection("messages").insertOne(myobj, function(err, response) {
      //check for insertion errors
      if (err) res.status(400).send(err);
      
      //If everything went well, return a 200 and success messsage!
      res.status(200).send('Success: ' + req.body.message);
      db.close();
    });
  });
};