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Asked: 2026-05-25T21:02:24+00:00

How do ObjectId’s work, and can I just use them anywhere I need a

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How do ObjectId’s work, and can I just use them anywhere I need a unique id and trust that it will be unique?

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  1. Editorial Team

    I think it depends on what you mean with “anywhere”? To ensure, that ObjectIds are unique, the following information is used for creating the hash for the object ID:

    • a unix timestamp
    • machine hostname
    • process id
    • increment

    see also the documentation at:

    http://www.mongodb.org/display/DOCS/Object+IDs#ObjectIDs-BSONObjectIDSpecification

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