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eval vs json parse
(version: 0)
Comparing performance of:
eval vs parse
Created:
8 years ago
by:
Guest
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Tests:
eval
eval('var crop = [1,2,3,4];');
parse
var crop = JSON.parse('[1,2,3,4]');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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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
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<iframe src="https://measurethat.net/Embed?id=611907" width="100%" height="500px"></iframe>
Test name
Executions per second
eval
3815329.0 Ops/sec
parse
14847887.0 Ops/sec
Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares the performance of using `eval()` versus `JSON.parse()` for parsing a simple array of numbers in JavaScript. **Options being compared:** * **`eval()`:** This function executes a string as JavaScript code. In this case, it's executing the string `'var crop = [1,2,3,4];'`, which declares a variable named "crop" and assigns it an array containing the numbers 1, 2, 3, and 4. * **`JSON.parse()`:** This function specifically parses JSON (JavaScript Object Notation) strings and converts them into JavaScript objects or arrays. Here, it's parsing the string `'[1,2,3,4]'`, which represents an array in JSON format, and assigns the resulting JavaScript array to the variable "crop". **Pros/Cons:** * **`eval()`**: * **Con:** Generally considered unsafe because it allows arbitrary code execution. There's a risk of injecting malicious code if the string passed to `eval()` comes from an untrusted source. * **Pro:** In this specific scenario, since the string is known and simple, it avoids the overhead of parsing JSON, potentially leading to slightly better performance in some cases. * **`JSON.parse()`**: * **Con:** Slightly slower than `eval()` for simple array parsing because it involves additional parsing logic. * **Pro:** Much safer and more secure, as it only parses valid JSON structures and avoids the risks associated with arbitrary code execution. **Other Considerations:** * In most real-world scenarios, using `JSON.parse()` is strongly recommended due to its security benefits. The slight performance difference in this simple case is often negligible compared to the potential security risks of `eval()`. * This benchmark only tests parsing a single array. Performance can vary significantly depending on the complexity and size of the JSON data being parsed. **Alternatives:** * **Manual Parsing:** For very specific cases, you could manually parse the JSON string using JavaScript's string manipulation functions. However, this is generally less efficient and more error-prone than `JSON.parse()`. * **Libraries:** There are numerous JavaScript libraries that provide more advanced JSON parsing capabilities, such as `fast-json-stringify` or `jsondate`, which may offer performance improvements for specific use cases. Let me know if you have any other questions!
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