mongodbHow to use unwind in MongoDB?

Unwind is an operator in MongoDB that allows you to deconstruct an array field from the input documents to output a document for each element in the array.

Example

db.collection.aggregate([
    {
        $unwind: "$arrayField"
    }
])

Output example

{ _id: 1, arrayField: "a" }
{ _id: 1, arrayField: "b" }
{ _id: 1, arrayField: "c" }

Code explanation

• $unwind: the operator used to deconstruct the array field
• arrayField: the array field to be deconstructed

Helpful links

• MongoDB Unwind Operator

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