mongodbHow to check if a document exists in MongoDB?

To check if a document exists in MongoDB, you can use the findOne() method. This method returns the first document that matches the query criteria.

Example

db.collection.findOne({name: "John"})

Output example

{
    "_id" : ObjectId("5f3d7f9f8f9f9f9f9f9f9f9f"),
    "name" : "John",
    "age" : 25
}

Code explanation

• db.collection: specifies the collection to query
• findOne(): method to query the collection
• {name: "John"}: query criteria

Helpful links

• MongoDB Documentation - findOne()

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