What is a MongoDB ObjectId?

An ObjectId is a 12-byte (24 character hex) unique identifier typically used in MongoDB. It has built-in creation timestamps.

How does the timestamp extraction work?

The first 4 bytes (8 hex characters) of every ObjectId represent the Unix epoch timestamp of when it was created.

Tools

Generate valid MongoDB ObjectIds and decode existing ones to extract their creation timestamp.

Paste ObjectId

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