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Select() is a method of Mongoose that is used to select document fields that are to be returned in the query result. It is used to include or exclude document fields that are returned from a Mongoose query. The select() method performs what is called query projection.

The find() function is used to find particular data from the MongoDB database. It takes 3 arguments and they are query (also known as a condition), query projection (used for mentioning which fields to include or exclude from the query), and the last argument is the general query options (like limit, skip, etc).

Select() Mongoose GET queries always return every field in the related document, which can be a substantial number of fields. Mongoose projection enables us to pick only the fields we need. A document may frequently include numerous fields, including arrays and embedded documents, which we occasionally may not need.

To filter object properties in mongoose, you can use the select() function on the query. The select() function allows you to select the fields you wish to return.

Projection() method of the Mongoose API is used on the Query objects. It allows us to set and configure the projection for the query objects. Using this method we can get the existing projection details and also we can remove the existing projection.

In MongoDB, projection means selecting only the necessary data rather than selecting whole of the data of a document. If a document has 5 fields and you need to show only 3, then select only 3 fields from them.

To filter object properties in mongoose, you can use the select() function on the query. The select() function allows you to select the fields you wish to return.

What is MongoDB Projection? MongoDB Projection is a special feature allowing you to select only the necessary data rather than selecting the whole set of data from the document. For Example, If a Document contains 10 fields and only 5 fields are to be shown the same can be achieved using the Projections.

You can select a single field in MongoDB using the following syntax: db. yourCollectionName. find({"yourFieldName":yourValue},{"yourSingleFieldName":1,_id:0});

All fields in a mongoose schema are optional by default (besides _id , of course). A field is only required if you add required: true to its definition. So define your schema as the superset of all possible fields, adding required: true to the fields that are required.