mongodbHow to update an array element in MongoDB?

Updating an array element in MongoDB can be done using the $set operator. The $set operator is used to specify the element in an array to update.

Example

db.collection.update(
   { _id: 1 },
   { $set: { "array.$[element].name": "updated" } }
)

Output example

WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

The code above updates the name field of the element in the array array that matches the element condition.

Code explanation

• db.collection.update: This is the MongoDB command used to update a document.
• { _id: 1 }: This is the condition used to identify the document to update.
• { $set: { "array.$[element].name": "updated" } }: This is the update operator used to update the name field of the element in the array array that matches the element condition.

Helpful links

• MongoDB Update Operators

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