In MongoDB, you can use the `update` or `findOneAndUpdate` method to update the document without deleting it.
Here is an example:
```
db.collection(‘collectionName’).update(
{ _id: ‘yourDocumentId’ },
{ $set: { ‘yourField’: ‘newValue’ } },
function(err, result) {
// check err or work with result
}
);
```
In this example, `collectionName` is the name of the collection you want to update, `yourDocumentId` is the id of the document you want to update, and `yourField` is the field you want to update inside that document.
The `$set` operator replaces the value of a field in a document with the specified value.
The `update` method only updates the first document that matches the query. If you want to update multiple documents that match the provided query, you should use the `updateMany` method.
Keep in mind that in order to use these methods, you first need to connect to a MongoDB database.
