UUID v4
128-bit random. RFC 4122 standard. Universally supported.
e.g. 550e8400-e29b-41d4-a716-446655440000
ULID
Lexicographically sortable. Timestamp-prefixed. URL-safe Base32.
e.g. 01ARZ3NDEKTSV4RRFFQ69G5FAV
Nano ID
Compact, URL-safe, customizable length. Smaller than UUID.
e.g. V1StGXR8_Z5jdHi6B-myT