Mastering the art of generating unique IDs in Javascript: Here`s how you can easily create a universally recognized identifier.

Table of content

  1. Introduction
  2. Understanding unique IDs
  3. Different ways of generating unique IDs in Javascript
  4. Using UUID to generate unique IDs
  5. Randomizing IDs using Math.random
  6. Hashing IDs with CryptoJS
  7. Creating unique IDs with timestamp
  8. Conclusion


Generating unique IDs is an essential aspect of many programming projects. It allows developers to create identifiers that are universally recognized and can be used to track specific data across different systems. In Javascript, there are different methods to generate unique IDs. However, not all of them are reliable and secure. In this article, we will explore how to master the art of generating unique IDs in Javascript, and we will show you some tips and tricks on how to create a universally recognized identifier. We'll cover different approaches to generate unique IDs, including using, Math.random(), UUID libraries, and more. So whether you are a beginner or experienced programmer, keep reading to learn how to create robust, unique IDs in your Javascript projects.

Understanding unique IDs

Unique IDs, also known as universally recognized identifiers, are important in web development and programming in general. These IDs are used to differentiate between different objects or entities within a system, allowing for efficient storage, retrieval and manipulation of data. When it comes to programming in Javascript, generating unique IDs is a key skill to master.

There are a variety of methods to generate unique IDs in Javascript, but one popular method involves using the Math.random() function. This function generates a random number between 0 and 1, which can then be converted into a unique string using various techniques such as the toString() method.

However, it is important to note that generating truly unique IDs in Javascript can be challenging. This is because the Math.random() function is not truly random and can produce duplicates if used repeatedly. One approach to mitigate this issue is to combine Math.random() with other unique identifiers, such as the current timestamp, to increase the likelihood of uniqueness.

Overall, understanding how to generate unique IDs in Javascript is an important skill for any programmer. By mastering this technique, you can create more efficient and robust applications that operate seamlessly across different platforms and systems.

Different ways of generating unique IDs in Javascript

There are several ways to generate unique IDs in Javascript, each with its pros and cons. One of the simplest methods is to use the Date() method, which returns the current date and time in milliseconds. This can be concatenated with a random number generated by Math.random() to create a unique string. However, this method is not foolproof, because if two users create IDs at the same time, they may end up with the same ID.

Another method is to use the UUID library, which generates unique IDs using a combination of timestamp, random number, and MAC address. This method is more reliable than the Date() method because it is less likely to generate duplicate IDs. However, it can be slower and more complex to implement.

A third method is to use a hashing function such as SHA-1 or MD5 to generate an ID from a unique input such as the user's email address or a combination of their name and date of birth. This method is secure and reliable, but it can be more complex to implement and may require additional libraries.

Ultimately, the choice of which method to use depends on the specific requirements of your project, including the level of security needed, the speed and reliability required, and the complexity of implementation. By understanding the strengths and weaknesses of each method, you can choose the best approach for your project and generate unique IDs with confidence.

Using UUID to generate unique IDs

One of the most reliable ways to generate unique IDs in Javascript is by using Universal Unique Identifiers, or UUIDs. UUIDs are 128-bit values that can be represented as either a 32-character string or a sequence of 16 octets. These values are guaranteed to be unique across the globe, making them ideal for generating unique identifiers for a variety of applications.

Here's how you can generate a UUID in Javascript:

const uuid = require('uuid');
const uuidv4 = uuid.v4();

console.log(uuidv4); // displays "110ec58a-a0f2-4ac4-8393-c866d813b8d1"

The above code imports the uuid library and uses the v4() method to generate a new UUID. The output is a string that represents the UUID in the standard 32-character format. You can use this UUID as an identifier in your application to uniquely identify clients, products, or any other relevant data.

Keep in mind that while UUIDs are guaranteed to be unique, they are not necessarily secure or private. If you need a more secure or private identifier, you may want to consider hashing the UUID or using a different method altogether.

Overall, UUIDs are a reliable and straightforward way to generate unique identifiers in Javascript. With their built-in uniqueness, they can save you time and effort in generating and managing unique identifiers for your applications.

Randomizing IDs using Math.random

To randomize IDs using Javascript, Math.random can be utilized to produce a unique identifier. The Math.random formula generates a random number from 0 to 1, where each decimal of the number is totally unpredictable. By using the random value generated by the formula and multiplying it by a sizeable number such as 10^16, a unique and random ID can be created.

One significant consideration when using Math.random to produce a unique ID is to avoid utilizing the same formula twice. If the same formula is used again, the same random values are often produced, resulting in recurring IDs. To prevent this, the formula can be supplemented with additional variables, such as time or date, to guarantee that the ID is entirely unique.

It's worth noting that while randomizing IDs is a practical solution, it may pose issues regarding memory allocation for larger scaling applications. In such situations, it might be beneficial to utilize optimized hash algorithms to guarantee efficiency and scalability. Nonetheless, for smaller applications that won't generate a large quantity of data, leveraging Math.random to create unique IDs is a simple and effective solution.

Hashing IDs with CryptoJS

One way to generate unique identifiers is by using hashing algorithms, and one of the most popular libraries for this purpose in JavaScript is CryptoJS. With CryptoJS, you can easily create a hash from a string, which can serve as a unique identifier.

To use CryptoJS, you need to include the library in your code, either by downloading it or linking to it via a CDN. Once you have the library set up, you can create a hash by calling the CryptoJS.MD5() function and passing in a string.

For example:

var myString = "Hello, world!";
var myHash = CryptoJS.MD5(myString).toString();
console.log(myHash); // Prints: "65a8e27d8879283831b664bd8b7f0ad4"

In this example, we create a string "Hello, world!" and pass it to the MD5 function. The resulting hash is a fixed-length 128-bit string, represented as a hexadecimal number. We then convert the hash to a string using the toString() method and store it in a variable.

Note that the same input string will always result in the same hash. This property is useful for creating unique identifiers that can be used consistently across multiple systems.

Hashing is not foolproof, however. It is possible for two different input strings to produce the same hash, known as a hash collision. This is why it's important to use a strong hashing algorithm, such as SHA-256, and to generate long, randomly generated input strings.

In summary, with CryptoJS, you can easily create a universally recognized identifier by using hashing algorithms. By using a strong hashing algorithm and generating long, randomly generated input strings, you can create a unique identifier that is difficult to duplicate.

Creating unique IDs with timestamp

Timestamps are often used to create unique identifiers, as they have a high degree of precision and can be easily converted into a string. In Javascript, the Date object is used to obtain the current timestamp.

Here's how to create a unique ID using the current timestamp:

const timestamp =;
const uniqueId = timestamp.toString();

The method returns the number of milliseconds since January 1, 1970, which is also known as Unix epoch time. This number is then converted to a string using the toString() method and assigned to the uniqueId variable.

Note that if you need to generate multiple unique IDs within a short time frame, it's possible that the timestamps will be identical. To avoid this, you can add a random number to the end of the string, like so:

const timestamp =;
const randomNum = Math.floor(Math.random() * 1000); // generates a random number between 0 and 999
const uniqueId = timestamp.toString() + randomNum.toString();

This will ensure that each unique ID is truly distinct. Keep in mind, however, that this method is not completely foolproof, as it's still possible for two unique IDs to be generated around the same time with the same random number. Nevertheless, it's generally reliable for most use cases.


In , generating unique IDs in Javascript is an essential skill that every developer should have. With the techniques and best practices discussed in this article, you can easily create a universally recognized identifier that will be unique and secure.

Remember that the key to generating unique IDs is to use a combination of different data types and algorithms to ensure that the identifier is always unique. Additionally, it's important to keep in mind the security implications of generating IDs and always use best practices to ensure that your identifiers are secure.

Finally, always test your code thoroughly to ensure that your IDs are indeed unique and that there are no performance issues. With these tips and tricks, you will be on your way to becoming an expert in generating unique IDs in Javascript.

My passion for coding started with my very first program in Java. The feeling of manipulating code to produce a desired output ignited a deep love for using software to solve practical problems. For me, software engineering is like solving a puzzle, and I am fully engaged in the process. As a Senior Software Engineer at PayPal, I am dedicated to soaking up as much knowledge and experience as possible in order to perfect my craft. I am constantly seeking to improve my skills and to stay up-to-date with the latest trends and technologies in the field. I have experience working with a diverse range of programming languages, including Ruby on Rails, Java, Python, Spark, Scala, Javascript, and Typescript. Despite my broad experience, I know there is always more to learn, more problems to solve, and more to build. I am eagerly looking forward to the next challenge and am committed to using my skills to create impactful solutions.

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