Uuid v7 rfc 9562 generation

Skill kjuhwa/skills-hub/skills/architecture/uuid-v7-rfc-9562-generation

Generate RFC 9562 compliant UUIDv7 with millisecond timestamp prefix for sortabilityFrom its SKILL.md

Install

npx -y skills add kjuhwa/skills-hub --skill uuid-v7-rfc-9562-generation

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SKILL.md

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UUIDv7 (RFC 9562) generator

UUIDv7 puts a 48-bit millisecond timestamp in the high bits, the version nibble in bits 48–51, and random bits everywhere else. IDs generated at different times sort lexicographically by time — ideal for append-only logs, outbox tables, and file naming.

Mechanism

function uuidv7() {
  const ms = Date.now();
  const hex = ms.toString(16).padStart(12, '0');
  const rnd = crypto.randomBytes(10);
  rnd[0] = (rnd[0] & 0x0f) | 0x70;       // version 7
  rnd[2] = (rnd[2] & 0x3f) | 0x80;       // variant 10
  const r = rnd.toString('hex');
  return `${hex.slice(0,8)}-${hex.slice(8,12)}-${r.slice(0,4)}-${r.slice(4,8)}-${r.slice(8,20)}`;
}

When to reuse

Message/event IDs where chronological sort matters.
Replacing ULID or Date.now()+nonce ad-hoc schemes.
Any ID space where a DB sequence is undesirable (distributed systems, file-based stores).

What ships with it

Read from the repository