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ObjectID Generator
Generate MongoDB ObjectID with optional custom timestamp
What is MongoDB ObjectID?
ObjectID is a 24-character hexadecimal identifier commonly used by MongoDB. It is made from a timestamp, a random value, and a counter. This tool creates syntactically valid ObjectIDs, but that does not mean a matching document exists in a database.
Frequently Asked Questions
How does ObjectID ensure uniqueness?
ObjectID combines a seconds-level timestamp, a random value, and a counter. The random value and counter together reduce collision risk within the same second.
What information can be extracted from an ObjectID?
Most commonly, you extract the embedded time from the first 8 hex characters. The next 10 are the random value, and the last 6 are the counter.
Why use custom timestamps?
Use a custom timestamp when you need a test ID that appears to belong to a specific point in time.