UUIDs in your code

In JavaScript, crypto.randomUUID() needs no library. For v7 and v5 use the uuid package or a few lines of code. Plus validation and a TypeScript type.

• crypto.randomUUID()
• uuid package
• v7 without a library
• TypeScript

The uuid module creates v4 and v5 in Python, and v7 from Python 3.14. Plus parsing, the uuid6 package for older versions and keys in Django and SQLAlchemy.

• uuid4()
• uuid7()
• uuid5()
• Django
• SQLAlchemy

PostgreSQL has a native uuid type, gen_random_uuid() and, from version 18, uuidv7(). Plus a v7 function for older versions and v5 with uuid-ossp.

• uuid type
• gen_random_uuid()
• uuidv7()
• v7 before 18
• uuid-ossp

MySQL has no UUID type: store UUIDs in BINARY(16) with UUID_TO_BIN() and BIN_TO_UUID(). Why UUID() gives v1, when the swap flag helps, and what MariaDB adds.

• BINARY(16)
• UUID_TO_BIN()
• IS_UUID()
• MariaDB

In the shell, uuidgen creates UUIDs on Linux and macOS. Plus v5 from a name, the kernel file on Linux, v7 with curl and checking UUIDs with grep.

• uuidgen
• /proc
• curl
• grep

java.util.UUID creates v4 in Java, while v7 and v5 come from java-uuid-generator. Plus parsing, bytes and JPA keys.

• UUID.randomUUID()
• v7 with a library
• v5
• JPA

In C#, Guid.NewGuid() for v4 and, from .NET 9, Guid.CreateVersion7(). Plus formats, the byte order trap and keys in Entity Framework Core.

• Guid.NewGuid()
• Guid.CreateVersion7()
• formats
• byte order
• EF Core

C++ has no UUID type in the standard library. Boost.Uuid creates random v4, v5 from a name and, in newer Boost versions, v7. Plus parsing and the 16 bytes.

• Boost.Uuid
• random_generator
• name_generator_sha1
• v7

PHP has no UUID function of its own. ramsey/uuid and symfony/uid create v4, v7 and v5, and with random_bytes() a few lines are enough. Plus checking and Laravel.

• ramsey/uuid
• symfony/uid
• random_bytes()
• Laravel

In PowerShell, New-Guid creates a random UUID, and PowerShell 7.5 adds v7 through .NET 9. Plus upper case and braces, checking with TryParse and any version from the API.

• New-Guid
• [guid]::CreateVersion7()
• formats
• Invoke-RestMethod

In Go, the package github.com/google/uuid creates v4, v7 and v5 and reads UUIDs. Plus why New() can panic, and UUIDs in database/sql and JSON.

• github.com/google/uuid
• uuid.NewV7()
• uuid.NewSHA1()
• database/sql

In Rust, the uuid crate creates v4, v7 and v5, but only with the right features. Plus parsing, the formats and UUIDs with serde and sqlx.

• uuid crate
• Uuid::now_v7()
• features
• serde
• sqlx

Kotlin on the JVM uses java.util.UUID, and Kotlin 2.0.20 added kotlin.uuid.Uuid for all platforms. Plus v7 with a library, parsing and a note on Android.

• UUID.randomUUID()
• kotlin.uuid.Uuid
• v7 on the JVM
• Android

In Ruby, SecureRandom.uuid creates v4, and Ruby 3.3 adds uuid_v7. Plus v5 with Active Support, checking with a pattern and UUID primary keys in Rails.

• SecureRandom.uuid
• uuid_v7
• Digest::UUID
• Rails

Swift creates random UUIDs with UUID() from Foundation. Why uuidString is upper case, how to read UUIDs, a short v7 function and UUIDs in Codable and SwiftData.

• UUID()
• uuidString
• v7 by hand
• Codable