Benchmark: eval vs json parse

Tests:

eval
eval('var crop = [1,2,3,4];');
parse
var crop = JSON.parse('[1,2,3,4]');

Historical Performance Data aggregated from 42 community runs

Desktop Results:

Chrome 24 runs

parse

8.9M/s

eval

2.5M/s

Fastest: parse (3.5x faster)

View exact numbers

✓ parse: 8,885,198 ops/sec
• eval: 2,539,194 ops/sec

Firefox 11 runs

parse

4.0M/s

eval

144K/s

Fastest: parse (27.9x faster)

View exact numbers

✓ parse: 4,024,346 ops/sec
• eval: 144,061 ops/sec

Mobile Results:

Chrome 7 runs

parse

2.1M/s

eval

786K/s

Fastest: parse (2.6x faster)

View exact numbers

✓ parse: 2,056,846 ops/sec
• eval: 786,395 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
eval
parse

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Windows

View result in a separate tab

parse

14.8M/s

eval

3.8M/s

View exact numbers

Test name	Executions per second
✓ parse	14,847,887 Ops/sec
eval	3,815,329 Ops/sec

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the benchmark definition and results.

**Benchmark Definition:**

The benchmark is called "eval vs json parse" and it compares two different approaches to parsing JSON data in JavaScript.

**Individual Test Cases:**

There are two test cases:

1. **"eval"**: This test case uses the `eval()` function to execute a string containing a JSON array: `'var crop = [1,2,3,4];'`. The `eval()` function parses the string as JavaScript code and executes it.
2. **"parse"**: This test case uses the `JSON.parse()` method to parse a JSON array string: `"var crop = JSON.parse('[1,2,3,4]');"`.

**Library:**

No external library is used in this benchmark.

**JavaScript Features/Syntax:**

* The benchmark uses the `eval()` function, which is a built-in JavaScript function that executes a string as JavaScript code.
* The test cases use the `JSON.parse()` method, which is a built-in JavaScript method for parsing JSON data.

**What's Being Tested:**

The benchmark compares the performance of two approaches to parsing JSON data:

1. **"eval()"**: Using the `eval()` function to execute a string containing a JSON array.
2. **"JSON.parse()"**: Using the `JSON.parse()` method to parse a JSON array string.

**Pros and Cons:**

* **"eval()"**:
	+ Pros: Can be faster than parsing JSON data using `JSON.parse()`, since it avoids the overhead of creating a new `Array` object.
	+ Cons: Can be less safe, as it executes arbitrary JavaScript code, which can lead to security vulnerabilities if not properly sanitized.
* **"JSON.parse()"**:
	+ Pros: Provides better safety and security, as it explicitly parses JSON data without executing arbitrary JavaScript code.
	+ Cons: May be slower than using `eval()`, since it needs to create a new `Array` object.

**Other Considerations:**

When deciding which approach to use, consider the following factors:

* **Security**: If you're dealing with user-supplied input or untrusted data, using `JSON.parse()` is generally safer.
* **Performance**: If performance is critical and you can trust your data sources, using `eval()` might be faster. However, be cautious about potential security vulnerabilities.

**Alternatives:**

If you need to parse JSON data and are concerned about performance or safety, consider the following alternatives:

* Use a dedicated JSON parsing library like **json5** or **fast-JSON-parse**, which can provide better performance and safety features.
* Implement your own custom parser using a JavaScript library like **regex-parser**, which can offer more control over the parsing process.

I hope this explanation helps you understand the benchmark definition and results!

eval vs json parse (version: 0)

Comparing performance of: `eval vs parse`

Created: 8 years ago by: Guest

Go to the latest result

eval

parse

Historical Performance Data aggregated from 42 community runs

Desktop Results:

Chrome 24 runs

Firefox 11 runs

Mobile Results:

Chrome 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

eval vs json parse (version: 0)

Comparing performance of: eval vs parse

Created: 8 years ago by: Guest

Go to the latest result

eval

parse

Historical Performance Data aggregated from 42 community runs

Desktop Results:

Chrome 24 runs

Firefox 11 runs

Mobile Results:

Chrome 7 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Comparing performance of: `eval vs parse`