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ulid/spec

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10,753 stele·182 fork-uri·GPL-3.0·2 vizualizări

Spec

This project provides the official specification for ULIDs, which are 128-bit identifiers that combine a millisecond-precision timestamp and random data. These identifiers are designed to be lexicographically sortable, ensuring that they maintain a strict chronological sequence for database indexing and time-based sorting.

The specification defines a standard for binary-to-string serialization using a Crockford-inspired Base32 alphabet. This encoding is intended to produce human-readable strings while excluding ambiguous characters to prevent transcription errors.

The technical standards cover monotonic sequencing rules to preserve the order of identifiers created within the same millisecond. It also details the partitioning of the 128-bit identifier into fixed-width segments for timestamps and random data.

Features

  • Time-Sortable - Generates identifiers that are naturally ordered by time for efficient database indexing.
  • Unique Identifier Generators - Produces globally unique identifiers that maintain chronological sort order.
  • Monotonic Identifier Generation - Ensures identifiers generated within the same millisecond are produced in a strictly increasing sequence.
  • System Timestamping - Prefixes identifiers with a millisecond timestamp to guarantee chronological ordering.
  • Millisecond Clock Sequences - Implements sequence numbers that reset per millisecond to preserve chronological order.
  • Identifier Generators - Creates unique 128-bit identifiers combining temporal data and randomness.
  • Identifier Specifications - Provides the official technical specification for the ULID identifier standard.
  • Binary-to-Text Encodings - Transforms binary identifier data into text to prevent human transcription errors.
  • Base32 Encoding - Uses a specific Base32 alphabet to encode binary identifiers into human-readable strings.
  • Binary-to-String Transformations - Implements the conversion of binary identifier data into human-readable textual representations.
  • Bit-Range Field Mapping - Defines the exact bit ranges for timestamps and random data within the 128-bit structure.

Istoric stele

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Întrebări frecvente

Ce face ulid/spec?

This project provides the official specification for ULIDs, which are 128-bit identifiers that combine a millisecond-precision timestamp and random data. These identifiers are designed to be lexicographically sortable, ensuring that they maintain a strict chronological sequence for database indexing and time-based sorting.

Care sunt principalele funcționalități ale ulid/spec?

Principalele funcționalități ale ulid/spec sunt: Time-Sortable, Unique Identifier Generators, Monotonic Identifier Generation, System Timestamping, Millisecond Clock Sequences, Identifier Generators, Identifier Specifications, Binary-to-Text Encodings.

Care sunt câteva alternative open-source pentru ulid/spec?

Alternativele open-source pentru ulid/spec includ: meituan-dianping/leaf — Leaf is a distributed unique ID generation system that provides two distinct modes for producing identifiers across… jetify-com/typeid — Typeid is a library for generating, encoding, and validating unique identifiers that combine human-readable prefixes… oklog/ulid — This project is an implementation of the ULID standard in the Go programming language. It provides tools for… uuidjs/uuid — This project is a UUID generation library providing a standards-compliant implementation of RFC 4122. It serves as a… twitter-archive/snowflake — Snowflake is a distributed unique ID generation service designed to produce non-colliding, time-ordered identification… kelektiv/node-uuid — node-uuid is a JavaScript library for generating and validating universally unique identifiers that comply with the…