metadata about UUIDs

Usage no npm install needed!

<script type="module">
  import uuidMeta from 'https://cdn.skypack.dev/uuid-meta';



Gets metadata about a UUID.


Copyright 2017 Fuzzy.ai

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


Requiring the module returns a function to use for getting metadata about a UUID.

  var uuidMeta = require('uuid-meta');

Calling the function will return an object with properties about the UUID.

  var metadata = uuidMeta("ea3b9dad-6761-4939-9ac4-fa27baa38da2");
  console.log(metadata.version); // 4

The interesting properties of the object returned are:

  • version: The version of the UUID standard used. Should be an integer between 0 and 5.
  • time_unix: For v1 UUIDs, the milliseconds since 1 Jan 1970 when the UUID was minted. Probably not valid for other versions.
  • mac_address: For v1 UUIDs, the MAC address used for minting the UUID. It's a string of 6 hexadecimal bytes separated by colons (':').
  • time: Time value for all UUIDs, counting 100 nanosecond periods since 15 Oct 1582. Might not be an actual time for most types of UUIDs.
  • node: Node identifier for minting of UUIDs. May or may not be a MAC address.
  • clock_seq: Clock sequence value.

There are a few other properties that come from the parsing process, but they're probably not interesting unless you're debugging the parsing process.