Benchmark: JSON.parse vs string.split

Script Preparation code:

var array = new Array(5000).fill('1').map(() => Math.random().toString());
var str = JSON.stringify(array);

Tests:

JSON.parse
JSON.parse(str);
String.split
str.split(',')

Historical Performance Data aggregated from 159 community runs

Desktop Results:

Chrome 105 runs

String.split

10K/s

JSON.parse

6K/s

Fastest: String.split (1.6x faster)

View exact numbers

✓ String.split: 10,321 ops/sec
• JSON.parse: 6,368 ops/sec

Firefox 29 runs

String.split

6K/s

JSON.parse

6K/s

View exact numbers

✓ String.split: 6,091 ops/sec
• JSON.parse: 5,749 ops/sec

Safari 8 runs

String.split

12K/s

JSON.parse

9K/s

Fastest: String.split (1.4x faster)

View exact numbers

✓ String.split: 12,233 ops/sec
• JSON.parse: 8,516 ops/sec

Mobile Results:

Chrome 12 runs

String.split

7K/s

JSON.parse

5K/s

Fastest: String.split (1.3x faster)

View exact numbers

✓ String.split: 6,550 ops/sec
• JSON.parse: 4,977 ops/sec

Safari 5 runs

String.split

12K/s

JSON.parse

8K/s

Fastest: String.split (1.6x faster)

View exact numbers

✓ String.split: 12,101 ops/sec
• JSON.parse: 7,505 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
JSON.parse
String.split

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:152.0) Gecko/20100101 Firefox/152.0

Browser/OS: Firefox 152 on Windows

View result in a separate tab

String.split

21K/s

JSON.parse

9K/s

View exact numbers

Test name	Executions per second
✓ String.split	20,698 Ops/sec
JSON.parse	8,587 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark measures the performance difference between two methods: `JSON.parse()` and `string.split()`. The script preparation code creates an array of 5000 random strings, converts it to a JSON string using `JSON.stringify()`, and then provides two test cases:

1. `JSON.parse(str);`
2. `str.split(',');`

**Options Compared**

The benchmark compares the execution time of two approaches:

* **`JSON.parse()`**: A JavaScript method that parses a JSON string into a JavaScript object.
* **`string.split(',')```**: A string method that splits a string into an array using a specified separator (in this case, a comma).

**Pros and Cons**

Here's a brief analysis of each approach:

* `JSON.parse()`: This method is designed to parse a specific data format, which can lead to:
	+ Better performance for large datasets, as it's optimized for parsing JSON.
	+ Potential security risks if the input string is not validated properly.
* `string.split(',')```**: This method is a general-purpose string splitting technique that can be used with various separators. However, it may lead to:
	+ Poor performance for very large or complex strings, as it uses regular expression matching.

**Library and Special Features**

In this benchmark, the following libraries are not explicitly mentioned, but their use implies:

* `JSON.stringify()` is a built-in JavaScript method that converts a JavaScript object into a JSON string.
* Regular expressions (regex) are used in `string.split(',')```, which is a common feature in JavaScript.

**Other Considerations**

When dealing with large datasets and performance-critical code, consider the following:

* Always validate input data to prevent security risks.
* Optimize data formats for your specific use case, as some formats may be more efficient than others.
* Be mindful of the trade-offs between precision, security, and performance.

**Alternatives**

If you're looking for alternative methods or libraries, consider:

* Using a dedicated JSON parser library, such as `fast-json-parser` or `json-stringify-safe`.
* Implementing custom string splitting algorithms using regex or other techniques.
* Exploring alternative data formats, like CSV or XML, which may offer better performance characteristics.

In summary, the benchmark measures the performance difference between two methods: `JSON.parse()` and `string.split()`. While `JSON.parse()` is optimized for parsing JSON and may lead to better performance, it also introduces security risks. The choice of approach depends on your specific use case, data format, and requirements.

JSON.parse vs string.split (version: 1)

Comparing performance of: `JSON.parse vs String.split`

Created: 5 years ago by: Registered User

Go to the latest result

JSON.parse

String.split

Historical Performance Data aggregated from 159 community runs

Desktop Results:

Chrome 105 runs

Firefox 29 runs

Safari 8 runs

Mobile Results:

Chrome 12 runs

Safari 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

JSON.parse vs string.split (version: 1)

Comparing performance of: JSON.parse vs String.split

Created: 5 years ago by: Registered User

Go to the latest result

JSON.parse

String.split

Historical Performance Data aggregated from 159 community runs

Desktop Results:

Chrome 105 runs

Firefox 29 runs

Safari 8 runs

Mobile Results:

Chrome 12 runs

Safari 5 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: `JSON.parse vs String.split`