scru64

SCRU64: Sortable, Clock-based, Realm-specifically Unique identifier

SCRU64 ID offers compact, time-ordered unique identifiers generated by distributed nodes. SCRU64 has the following features:

• ~62-bit non-negative integer storable as signed/unsigned 64-bit integer
• Sortable by generation time (as integer and as text)
• 12-digit case-insensitive textual representation (Base36)
• ~38-bit Unix epoch-based timestamp that ensures useful life until year 4261
• Variable-length node/machine ID and counter fields that share 24 bits

// pass node ID through global variable
globalThis.SCRU64_NODE_SPEC = "42/8";

import { scru64Sync, scru64StringSync } from "scru64";
// or on browsers:
// import { scru64Sync, scru64StringSync } from "https://unpkg.com/scru64@^0.3";

// generate a new identifier object
const x = scru64Sync();
console.log(String(x)); // e.g., "0u2r85hm2pt3"
console.log(x.toBigInt()); // as a 64-bit unsigned integer

// generate a textual representation directly
console.log(scru64StringSync()); // e.g., "0u2r85hm2pt4"

See SCRU64 Specification for details.

SCRU64's uniqueness is realm-specific, i.e., dependent on the centralized assignment of node ID to each generator. If you need decentralized, globally unique time-ordered identifiers, consider SCRU128.

Command-line interface

$ SCRU64_NODE_SPEC=42/8 npx scru64
0uc3xnefo50h
$ SCRU64_NODE_SPEC=42/8 npx scru64 -n 4
0uc3xnl3eas9
0uc3xnl3easa
0uc3xnl3easb
0uc3xnl3easc

License

Licensed under the Apache License, Version 2.0.

See also

• API Documentation
• Run tests on your browser