Benchmark: Math.random vs crypto.getRandomValues vs uuid

Tests:

Math.random
Math.random()
crypto API
crypto.getRandomValues(new Uint8Array(1))
Uuid
crypto.randomUUID()

Historical Performance Data aggregated from 7 community runs

Desktop Results:

Chrome 7 runs

Math.random

95.5M/s

crypto API

795K/s

Uuid

743K/s

Fastest: Math.random (128.6x faster)

View exact numbers

✓ Math.random: 95,520,136 ops/sec
• crypto API: 794,764 ops/sec
• Uuid: 742,698 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.random
crypto API
Uuid

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.1 Safari/605.1.15

Browser/OS: Safari 26 on Mac OS X 10.15.7

View result in a separate tab

Math.random

429.0M/s

Uuid

11.4M/s

crypto API

6.3M/s

View exact numbers

Test name	Executions per second
✓ Math.random	428,968,832 Ops/sec
Uuid	11,395,888 Ops/sec
crypto API	6,261,024 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmarking test case on MeasureThat.net. The goal is to compare the performance of three different methods: `Math.random()`, `crypto.getRandomValues(new Uint8Array(1))`, and `uuid`.

**Methods Being Compared**

1. **`Math.random()`**: This method generates a random number between 0 (inclusive) and 1 (exclusive). It's a simple, widely used function in JavaScript.
2. **`crypto.getRandomValues(new Uint8Array(1))`**: This method generates a cryptographically secure random byte from the `crypto` module. The `getRandomValues()` function returns an array of values, so we create a `Uint8Array` to get a single value.
3. **`uuid`**: This is a library that generates universally unique identifiers (UUIDs). We'll use it to generate a UUID string.

**Pros and Cons of Each Approach**

1. **`Math.random()`**:
	* Pros: Simple, widely supported, fast in most cases.
	* Cons: May not be suitable for generating cryptographically secure random numbers.
2. **`crypto.getRandomValues(new Uint8Array(1))`**:
	* Pros: Generates cryptographically secure random numbers, suitable for applications requiring high security.
	* Cons: May be slower than `Math.random()` due to the overhead of the `crypto` module and generating a single byte.
3. **`uuid`**:
	* Pros: Fast, easy to use, generates unique identifiers.
	* Cons: Not suitable for generating cryptographically secure random numbers.

**Library Used in the Test Case**

In this test case, the `uuid` library is used to generate a UUID string.

**Special JavaScript Features or Syntax Used**

The `crypto.getRandomValues()` function uses a Web Cryptography API (W3C) method to generate cryptographically secure random numbers. This API provides a way for web applications to access cryptographic functions, such as generating random numbers.

**Other Alternatives**

If you need to generate cryptographically secure random numbers in JavaScript, consider using:

* `crypto.randomBytes()`: Generates an array of cryptographically secure random bytes.
* `window.crypto.getRandomValues()`: Similar to `crypto.getRandomValues()`, but uses the Web Cryptography API on Windows and Chrome.

For generating unique identifiers, you can use other libraries like `uuid.js` or `v4`.

In summary, the benchmark compares the performance of three different methods for generating random numbers: `Math.random()`, `crypto.getRandomValues(new Uint8Array(1))`, and a UUID string from the `uuid` library. The choice of method depends on your specific requirements, such as security, speed, or uniqueness.

Math.random vs crypto.getRandomValues vs uuid (version: 0)

Fast and quick test

Comparing performance of: `Math.random vs crypto API vs Uuid`

Created: 3 years ago by: Guest

Go to the latest result

Math.random

crypto API

Uuid

Historical Performance Data aggregated from 7 community runs

Desktop Results:

Chrome 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

Math.random vs crypto.getRandomValues vs uuid (version: 0)

Fast and quick test

Comparing performance of: Math.random vs crypto API vs Uuid

Created: 3 years ago by: Guest

Go to the latest result

Math.random

crypto API

Uuid

Historical Performance Data aggregated from 7 community runs

Desktop Results:

Chrome 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Comparing performance of: `Math.random vs crypto API vs Uuid`