Random uuid generator javascript2/18/2024 The serialization of a Uint8Array in JSON form is not very efficient, requiring 61 characters.A few months ago, I dashed out a JavaScript function to efficiently generate a random (version 4) UUID per RFC 4122. That's a 4.5-fold performance improvement, which will be immediately realized in indexing, searching, and other operations with UUIDs.įinal Final Addendum: Transmitting UUIDs in JSON form. On the other hand, using a Uint8Array for UUID storage only requires 16 bytes. The string form of a UUID requires 36 characters, which, at JavaScript's 2-bytes per character storage, yields a 72 byte storage requirement. It usually better to deal with UUIDs in typed array ( Uint8Array) form instead of strings, for both improved space and time performance. These last three illustrated options are likely the safest option for generating UUID v4 Uint8Arrays on any platform that supports the crypto module, as it moves the critical native crypto.randomUUID() to the front face of your source code, while still allowing you to use the convenient manipulation methods provided by the uuid npm package.įinal addendum: Handling UUIDs as strings vs Uint8Arrays Therefore, I suggest a simple and safe mechanism for generating UUID 16-byte Uint8Array arrays, suitable for most users needing UUIDs in Uint8Array form call crypto.randomUUID() directly, then surround with uuid.parse() as shown below. Therefore, I would strongly encourage calling crypto interface methods directly in your codebase. Developers reviewing UUID generation code of a codebase will want to be confident and certain that they are accessing crypto's secure random number generation, instead of less secure methods. The native crypto random call is a critical system-level API call to request cryptographically secure random numbers. However, a security conscious developer may not, in general, want the native crypto random call(s) buried deep within package sub-modules, and then, even more, behind walls of conditional logic. A crypto.randomFillSync() call is likely of equivalent robustness to crypto.randomUUID(), so this is likely not a concern. Observe from src/v4.js that passing either a buf or options argument to uuid.v4() will cause it to no longer call crypto.randomUUID() for the random uuid, instead it will use either a passed source of randomness from options, or fallback to a crypto.randomFillSync() call. Minor additional notes for those who wish to split hairs: Which references a native module, which exports crypto.randomUUID as randomUUID: You can observe this by viewing the source code of the uuid npm package: The choice between the two methods depends on the specific requirements of your application. UUIDs are a good choice for generating globally unique identifiers, while Crypto.randomUUID is useful for generating unique identifiers within the context of a single user's browser. In conclusion, both UUIDs and Crypto.randomUUID are useful methods for generating unique identifiers in JavaScript. This can be useful for generating unique identifiers for session tokens or user IDs. Crypto.randomUUID is a good choice when you need to generate unique identifiers within the context of a single user's browser. They are widely used and well-established in the computer industry. UUIDs are a good choice when you need to generate unique identifiers for objects in a distributed system or across multiple systems. Another difference is that UUIDs are designed to be globally unique, while Crypto.randomUUID is unique within the context of the user's browser. UUIDs are generated using a specific algorithm that ensures they are unique, while Crypto.randomUUID uses a cryptographically secure random number generator to create unique identifiers. The main difference between UUIDs and Crypto.randomUUID is the way they generate random numbers. Enter fullscreen mode Exit fullscreen modeĭifferences between UUIDs and Crypto.randomUUID:
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