You can add a new field to an existing MongoDB document using the $set operator. The $set operator replaces the value of a field with the specified value.

Here is an example using the mongo shell where we add a new field “email” to a document in “users” collection with a certain “\_id”:

```
db.users.updateOne( { _id: YOUR_DOCUMENT_ID }, { $set: { “email” : “yourmail@mail.com” } }
)
```
If you’re using the MongoDB Node.js driver the syntax is similar:

```
const MongoClient = require(‘mongodb’).MongoClient;
const uri = ‘mongodb+srv://:@cluster0.mongodb.net/test?retryWrites=true&w=majority’;
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

client.connect((err, client) => { if (err) throw err;

const collection = client.db(“test”).collection(“users”); collection.updateOne( { _id: YOUR_DOCUMENT_ID }, { $set: { “email” : “yourmail@mail.com” } }, function(err, res) { if (err) throw err; console.log(“Document updated”); client.close(); }); }); ``` Note: Replace `` and `` with your actual MongoDB username and password. And replace `YOUR_DOCUMENT_ID` with the actual document id where you want to add the new field. Replace `“yourmail@mail.com”` with the actual email value you want to add.

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