Benchmark: Object.keys.length vs JSON.stringify Large Object

Script Preparation code:

var testData = { toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi',toto: 'titi' };

Tests:

object keys
Object.keys(testData).length === 0
json stringify
JSON.stringify(testData) === '{}';

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

object keys

92.5M/s

json stringify

17.7M/s

Fastest: object keys (5.2x faster)

View exact numbers

✓ object keys: 92,532,064 ops/sec
• json stringify: 17,663,854 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
object keys
json stringify

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Mac OS X 10.15.7

View result in a separate tab

object keys

156.4M/s

json stringify

23.0M/s

View exact numbers

Test name	Executions per second
✓ object keys	156,355,488 Ops/sec
json stringify	22,979,104 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition and Script Preparation Code**

The provided JSON represents a benchmark test for comparing the execution time of two approaches: `Object.keys()` and `JSON.stringify()`. The script preparation code generates a large object (`testData`) with 24 duplicate properties, which is used as input for both tests.

Here's a breakdown of what's being tested:

1. **`Object.keys()`**: This method returns an array of strings representing the property names of an object. In this case, it will return an empty array because the `testData` object has only one unique property name (`toto`). The benchmark aims to measure how fast `Object.keys()` can be executed.
2. **`JSON.stringify()`**: This method converts a value (in this case, the entire `testData` object) to a JSON string. In this specific test case, it's comparing the resulting string with an empty string (`''`). The benchmark measures how quickly `JSON.stringify()` can produce this string.

**Options Compared**

The two options being compared are:

1. **`Object.keys()`**: This approach uses the built-in method for iterating over object properties.
2. **`JSON.stringify()`**: This approach converts the entire object to a JSON string using the `JSON.stringify()` method.

**Pros and Cons of Each Approach**

Here's a brief analysis of each approach:

1. **`Object.keys()`**:
	* Pros: Typically faster than `JSON.stringify()`, as it only iterates over the object's properties, not the entire object's value.
	* Cons: May have additional overhead due to the need to create an array of property names, which can be slower for very large objects.
2. **`JSON.stringify()`**:
	* Pros: Often more efficient when dealing with complex data structures or large objects, as it only needs to serialize the object's value once.
	* Cons: Can be slower than `Object.keys()` due to the overhead of serializing the entire object.

**Library and Special JS Feature**

In this benchmark, there is no specific library being used. However, `JSON.stringify()` uses a built-in JavaScript method, which is part of the standard language specification. No special syntax or features are required for either approach.

**Other Alternatives**

If you're looking for alternative approaches to measure performance in JavaScript, consider:

1. **`for...in` loops**: These can be used to iterate over object properties, but may not be as efficient as `Object.keys()`.
2. **`Array.prototype.forEach()`**: This method can also be used to iterate over array elements, but may not be suitable for objects.
3. **`V8 Profiler`** (for Chrome): A built-in profiling tool that allows you to measure performance and memory usage in your JavaScript code.

Keep in mind that these alternatives might not provide the same level of accuracy or control as using `Object.keys()` or `JSON.stringify()`.

Object.keys.length vs JSON.stringify Large Object (version: 0)

Comparing performance of: `object keys vs json stringify`

Created: 3 years ago by: Guest

Go to the latest result

object keys

json stringify

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Object.keys.length vs JSON.stringify Large Object (version: 0)

Comparing performance of: object keys vs json stringify

Created: 3 years ago by: Guest

Go to the latest result

object keys

json stringify

Historical Performance Data aggregated from 8 community runs

Desktop Results:

Chrome 8 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `object keys vs json stringify`