UUIDer

UUIDer is an open-source software library and command-line tool for generating and manipulating Universally Unique Identifiers (UUIDs). It provides generation, validation, formatting, and parsing across multiple UUID versions, aiming to simplify UUID handling in distributed systems and data stores.

UUIDer originated as a lightweight CLI designed to produce and verify UUIDs, and later evolved into a multi-language library with bindings for several programming environments. The project is maintained by volunteers and released under a permissive license.

Key features include support for UUID versions 1, 3, 4, and 5, deterministic generation for testing, and robust parsing and validation of UUID strings. It offers multiple string representations, such as canonical hyphenated and compact forms, and includes options for controlling randomness or clock/namespace inputs where applicable. The implementation emphasizes cross-platform compatibility and performance, with a simple API and minimal dependencies.

Across languages, UUIDer is implemented in Python, JavaScript/TypeScript, Go, and Rust, and is distributed through common package managers and platforms, including PyPI, npm, and crates.io, as well as standalone binaries.

Common use cases include generating identifiers for microservices requests, database keys, and configuration labels, where portability and namespace-driven generation are important. The design aligns with the UUID standards described in RFC 4122, while practical variations exist between versions and bindings.

See also: Universally Unique Identifier, RFC 4122, UUID versions 1, 3, 4, 5.