39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
---
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page_title: uuid - Functions - Configuration Language
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description: The uuid function generates a unique id.
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sidebar_title: uuid
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---
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# `uuid` Function
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`uuid` generates a unique identifier string.
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The id is a generated and formatted as required by
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[RFC 4122 section 4.4](https://tools.ietf.org/html/rfc4122#section-4.4),
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producing a Version 4 UUID. The result is a UUID generated only from
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pseudo-random numbers.
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This function produces a new value each time it is called, and so using it
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directly in resource arguments will result in spurious diffs. We do not
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recommend using the `uuid` function in resource configurations, but it can
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be used with care in conjunction with
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[the `ignore_changes` lifecycle meta-argument](/language/meta-arguments/lifecycle#ignore_changes).
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In most cases we recommend using [the `random` provider](https://registry.terraform.io/providers/hashicorp/random/latest/docs)
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instead, since it allows the one-time generation of random values that are
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then retained in the Terraform [state](/language/state/) for use by
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future operations. In particular,
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[`random_id`](https://registry.terraform.io/providers/hashicorp/random/latest/docs/resources/id) can generate results with
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equivalent randomness to the `uuid` function.
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## Examples
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```
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> uuid()
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b5ee72a3-54dd-c4b8-551c-4bdc0204cedb
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```
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## Related Functions
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* [`uuidv5`](/language/functions/uuidv5), which generates name-based UUIDs.
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