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UUID CDN Example

Posted Under: JavaScript, Programming, Tutorials on Nov 4, 2024
UUID stands for Universally Unique Identifier, a 128-bit identifier commonly used for identifying unique entities. A UUID is typically represented as a 36-character string (e.g., 550e8400-e29b-41d4-a716-446655440000). There are five different versions of UUIDs, each with a different purpose. The most commonly used versions are:
  1. UUID v1: Based on time and node information.
  2. UUID v4: Randomly generated.
  3. UUID v5: Based on namespace and a name, creating a deterministic UUID.
The JavaScript uuid library is a lightweight, highly performant library that makes generating UUIDs simple and efficient. It offers support for multiple UUID versions, including v1, v4, and v5. This allows developers to generate UUIDs according to their specific requirements, whether it's for ensuring complete randomness (v4) or generating predictable, deterministic identifiers (v5). You can quickly start using the uuid library by loading it through a CDN or by installing it with a package manager. If you want to use uuid in a web application without installing it via npm, you can load it directly from a CDN. Here’s how: 
<script src="https://cdn.tutorialjinni.com/uuid/8.3.2/uuidv5.min.js"></script>
Once the library is set up, you can start generating UUIDs with just a few lines of code. Below is an example of how to generate different types of UUIDs.

Generating a Random UUID (v4)

UUID v4 is the most commonly used version for generating random IDs. Here’s how you can generate one: 
<script>
  const randomUUID = uuid.v4();
  console.log(`Random UUID v4: ${randomUUID}`);
</script>

Generating a Name-Based UUID (v5)

UUID v5 is a deterministic way to generate UUIDs, often based on a namespace and a name. This is especially useful when you need to generate the same UUID based on the same input, such as hashing a user’s email to generate a unique ID. 
<script>
  const MY_NAMESPACE = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
  const nameBasedUUID = uuid.v5('example.com', MY_NAMESPACE);
  console.log(`Name-Based UUID v5: ${nameBasedUUID}`);
</script>
The uuid library offers several features that make it a versatile and efficient tool for generating unique identifiers. It is lightweight and optimized for performance, suitable for both client-side and server-side applications. Supporting multiple UUID versions (v1, v4, v5), it provides flexibility, allowing developers to select the most suitable type for their needs. With version 5, it even enables deterministic UUID creation by accepting a namespace and a name. UUIDs generated by this library have a variety of use cases, including serving as primary keys in distributed databases where sequential IDs are impractical, uniquely identifying user sessions across servers, naming files to prevent overwrites, and creating unique, unpredictable URLs for API resources, adding a layer of security.


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