ULID Generator は何をしますか？
ULID Generator はブラウザ上で結果を生成するツールで、結果と制限を明確に示します。 検証済みの機能： Cryptographic random bits, Sortable identifier output, Bulk generation, Timestamp inspection.
ULID favors sortable identifiers
Choose ULID when lexicographic sorting by approximate creation time is useful. Choose UUID v4 for a widely supported opaque random identifier, or a database-native sequence when centralized ordering is acceptable.
使い方
- Choose a count from 1 to 100 and select Generate.
- Copy the 26-character Crockford Base32 values in the order produced.
- Paste any ULID into Inspect ULID to validate it and read its embedded millisecond timestamp.
実際の入出力例
Inspect the canonical ULID example
入力
01ARZ3NDEKTSV4RRFFQ69G5FAV出力
Status: Valid
Timestamp: 2016-07-30T23:54:10.259Z
Random bits: 80The first ten characters encode a 48-bit Unix-millisecond timestamp; the remaining sixteen encode 80 random bits.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| A 26-character value is marked invalid. | It contains excluded Crockford characters such as I, L, O, or U, or its first character would overflow 128 bits. | Use the ULID alphabet and require the first character to be 0 through 7. |
| Generated values reveal when records were created. | Time ordering is an intentional ULID property. | Choose UUID v4 when exposing approximate creation time is undesirable. |
Important behavior of ULID Generator
このツール固有の制限： Time ordering reveals approximate creation time; choose UUID v4 when that disclosure is unwanted.
標準と実装の参考資料
- ULID specification (opens in a new tab)Defines the 128-bit layout, Crockford Base32 encoding, timestamp, and randomness fields.
- MDN — Crypto.getRandomValues() (opens in a new tab)Documents the cryptographic random-byte source used by the generator.
ULID Generator — FAQ
Does the ULID Generator upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the ULID Generator accept?
It accepts a requested count from 1 to 100 or a ULID to inspect. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the ULID Generator produce?
It produces Crockford Base32 ULIDs and decoded creation timestamps. Copy and download controls appear when the output format supports them.
What limitation should I know?
Time ordering reveals approximate creation time; choose UUID v4 when that disclosure is unwanted.
更新内容
実質的な更新： ULID Generator: Added Cryptographic random bits, Sortable identifier output, Bulk generation, Timestamp inspection, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.