{
  "id": "identifier/nanoid",
  "family": "identifier",
  "slug": "nanoid",
  "title": "Nano ID",
  "summary": "Nano ID is a compact, URL-safe random string identifier: by default 21 characters drawn uniformly from a 64-symbol alphabet 'A-Za-z0-9_-', giving 126 bits of entropy (collision odds comparable to UUIDv4). It has no internal structure, timestamp, or fixed binary width — it is purely random — so it is not time-sortable, but it is shorter than a UUID and safe in URLs and filenames.",
  "kind": "identifier",
  "aliases": [
    "nanoid",
    "Nano ID",
    "nano-id"
  ],
  "status": "de-facto",
  "verification": "verified",
  "tier": "B",
  "source_url": "https://github.com/ai/nanoid",
  "source_version": "ai/nanoid (unversioned)",
  "retrieved_date": "2026-05-29",
  "see_also": [
    "identifier/uuidv4",
    "identifier/ulid"
  ],
  "ext_type": "identifier@1",
  "ext": {
    "spec": "Nano ID (github.com/ai/nanoid)",
    "example": "V1StGXR8_Z5jdHi6B-myT",
    "length_bits": 126,
    "sortable": false,
    "encoding": "URL-safe alphabet A-Za-z0-9_- (64 symbols), default 21 characters",
    "notes": [
      "No fixed binary layout: every character is independent uniform randomness from a 64-symbol alphabet, so there is no bit_layout, timestamp, or version field.",
      "Default size 21 chars * log2(64) = 126 bits of entropy, slightly more than UUIDv4's 122; the alphabet and length are configurable.",
      "URL- and filename-safe ('_' and '-' instead of base64's '+'/'/'); not sortable and not deterministic.",
      "Example V1StGXR8_Z5jdHi6B-myT is the README sample."
    ]
  },
  "updated": "2026-05-29T00:00:00Z"
}