UUID Generator npm

Purpose & User Intent: The tool generates RFC 4122 UUIDs for Node.js/npm projects to supply unique identifiers for fixtures, test data, distributed tracing tokens, session IDs, and configuration samples. Primary users are software developers, QA engineers, DevOps, and build pipelines who require reliable, repeatable IDs without external dependencies. It supports batch generation in a single invocation and allows selecting a UUID version and output formatting. When deterministic results are needed, v3 or v5 can produce stable IDs from a provided namespace and name. This tool is designed for programmatic consumption by scripts and CI workflows, not for cryptographic security purposes. Core Logic & Features: Core capabilities include: (1) version selection from {1,3,4,5}; (2) batch generation with a configurable count; (3) formatting control (hyphenated vs compact); (4) deterministic derivation for v3/v5 using namespace and name; (5) output as an array of strings with optional serialization; (6) validation and structured error reporting. Required features: count > 0 and version in {1,3,4,5}. Optional/advanced features: providing namespace+name for v3/v5, choosing formatting, and exporting results to common data structures or files via downstream tooling. Inputs & Outputs: Inputs: count (integer, required, sample 5, range 1-10000); version (enum 1,3,4,5; default 4); hyphenated (boolean, default true); namespace (string, optional); name (string, optional). Outputs: uuids (array of strings); format (string: 'hyphenated' or 'compact'); sample output format shown in documentation. Algorithms & Calculations: V4 uses a cryptographically strong RNG to create random-based UUIDs; V1 uses time-based components with a node identifier; V3 uses MD5(namespace, name) to derive a namespace-based UUID; V5 uses SHA-1(namespace, name). The tool validates inputs before applying the algorithm and normalizes hyphenation after generation. Error & Edge Cases: Invalid count (<=0 or >10000) triggers input error; invalid version (not in 1,3,4,5) triggers error; for v3/v5, missing namespace or name triggers fallback to v4 when possible or returns an error if critical inputs are absent; extremely large counts may impact memory; collisions are statistically negligible but not guaranteed across wildly separate runs. Industry/Region & Localization: UUID definitions follow RFC 4122; outputs are locale-agnostic, language-agnostic, and suitable for globally distributed systems; no currency or regional formatting applies. Assumptions & Exclusions: Assumes RFC 4122 UUIDs satisfy the user's needs for unique identifiers; not intended as a cryptographic security mechanism; no persistence, storage, or database integration; no guarantees of global uniqueness beyond RFC 4122 properties.