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In MongoDB, you can update an object by using the update() or updateOne() method. To update an object with a specific key match, you can use the $set operator in the update query. The $set operator updates a particular field with a new value.

For example, if you have a collection named "users" with documents that look like this:

{ 
  _id: ObjectId("1234567890"), 
  name: "John Doe", 
  age: 30, 
  email: "johndoe@example.com" 
}

And you want to update the email address of the user with the name "John Doe", you can use the following code:

db.users.updateOne(
  { name: "John Doe" }, 
  { $set: { email: "newemail@example.com" } }
)

This query searches for a document with the name "John Doe" and updates the email field with the new value "newemail@example.com". If multiple documents match the query, only the first document will be updated. You can use update() for updating multiple documents that match the query.