![]() Caching random data is not always desirable, so as an additional option, the Node.js implementation of crypto. In contrast, crypto.randomUUID() has a mean execution time of only 350 nanoseconds per UUID, with a minimum of 220 and a maximum of 663551. ![]() Running on my benchmark server locally, the uuid module has a mean execution time of about 1030 nanoseconds per UUID, with a minimum of 640 and a maximum of 870399. The h1 histogram shows the results for the uuid module. These are the only fixed values in a random UUID - all other bits in the sequence are randomly generated.Ĭopy to Clipboard import ) The reserved field identifies the variant which is encoded into the clock-seq-and-reserved field in the eighth byte in the UUID. As described in RFC 4122, the version is “in the most significant 4 bits of the timestamp (bits 4 through 7 of the time_high_and_version field)”, which - if it’s not clear - are the four most significant bits of the sixth byte in the UUID. The version and reserved fields in the UUID identify the layout and type. Of particular note in this structure are the “version” and “reserved” bits (the time-high-and-version and clock-seq-and-reserved fields in the structure definition above). They actually have a structure as defined by RFC 4122:Ĭopy to Clipboard UUID = time-low "-" time-mid "-" UUIDs aren’t simply a sequence of hex-encoded digits. uuid has been out there for longer (since 11 years ago), it also has. It’s also worth knowing that uuid module maintainers helped us to review the new API that landed in Node.js core). It was authored by James Brumond on May, 2012. (It’s important to note that the uuid module is not going anywhere.
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