UUID v5 Generator

UUID v5 is a namespace-based UUID that yields the same identifier for the same namespace/name pair each time. This tool implements the official UUID v5 spec by hashing the namespace UUID together with the input name using SHA-1, producing a deterministic 128-bit value presented in the standard 8-4-4-4-12 hex format. The primary users are developers, system architects, and data engineers who need stable IDs for resources, configuration keys, or API objects, ensuring referential integrity across environments and deployments. It is suitable for use in databases, logs, and API payloads where deterministic identifiers are required, avoiding the pitfalls of random IDs that change on each generation.

Conceptual workflow: the namespace UUID binds a domain or scope to a name; the same pair always yields the same UUID. The tool accepts either a standard namespace (DNS, URL, OID, X.500) or a user-provided namespace UUID, and it outputs a lowercase, hyphenated UUID string. With the deterministic result, systems can derive IDs locally without querying a central service, enabling offline idempotence and easier data reconciliation.

Core differentiators: strict adherence to RFC 4122 for v5, support for multiple namespace options, and a clean, developer-focused input model. Common use cases include resource identifiers in microservices, stable keys for distributed caches, and reference IDs in logs that remain constant across rollouts. The tool emphasizes reproducibility and interoperability, allowing straightforward integration into CI/CD pipelines and data pipelines.

Out-of-scope and caveats: it does not generate random IDs or v3; it requires a namespace to be defined prior to use; if a namespace changes, the computed UUID changes. It assumes UTF-8 for the name input and does not perform semantic validation of the name content beyond string encoding. It does not store or remember prior results beyond what the caller provides.