How to update if exists otherwise insert new document?

Question

How to update if exists otherwise insert new document in javascript/node.js? I am getting as parameter to function dictionary,if dictionary contains _id should update, othe

Answer 1

[db.collection.replaceOne(filter, replacement, options)] with upsert:true

E.g. from here:

try {    db.restaurant.replaceOne(
            { "name" : "Pizza Rat's Pizzaria" },
            { "_id": 4, "name" : "Pizza Rat's Pizzaria", "Borough" : "Manhattan", "violations" : 8 },
            { upsert: true }    
         ); 
    }
catch (e){ print(e); }