Benchmark: JSON.parse vs String.substring for fetching one value

Script Preparation code:

var ob = `{"aenderungen":[],"_id":"64c0fc4abd2c8bd76c9553f2","name":"Maxis","geburtsdatum":"2023-08-02T00:00:00.000Z","ICD10Code":"k k k k k ","position":0,"empfangsdatum":"2023-07-26T10:58:18.716Z","hinzugefügtVon":"6498bf3b2afb897aa26d18e6","infos":{"berichte":"ggg","puls":"hallo yazn "},"positionarr":[0,0],"stationen":[],"__v":0}`

Tests:

JSON.parse()
var value = JSON.parse(ob)._id;
String.substring
const value = ob.substring(25,49);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON.parse()
String.substring

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser/OS: Firefox 115 on Windows 7

View result in a separate tab

Test name	Executions per second
JSON.parse()	591218.8 Ops/sec
String.substring	113683104.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript benchmarks!

The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of two different approaches: `JSON.parse()` and `String.substring` for fetching a specific value from a JSON object.

**Benchmark Definition**

The test aims to determine whether it is faster to extract a value using `JSON.parse()` or directly via `String.substring`. The benchmark definition is as follows:

* Prepare a sample JSON object `ob`
* Use `JSON.parse(ob)` to parse the JSON and extract the `_id` property
* Compare the performance of this approach with another one:
	+ Extract the 25th to 49th character of the string using `String.substring(25, 49)`

**Options Compared**

Two options are compared:

1. **JSON.parse()**: This method parses a JSON string and returns a JavaScript object.
2. **String.substring()**: This method extracts a section of a string.

**Pros and Cons**

* **JSON.parse():**
	+ Pros:
		- Easier to read and maintain, as it uses a more human-readable format
		- Can be used with other JSON-related functions (e.g., `JSON.stringify()`)
	+ Cons:
		- May have performance overhead due to the parsing process
		- May not be suitable for large or complex JSON objects
* **String.substring():**
	+ Pros:
		- Highly optimized for performance, as it directly accesses the string data
		- Can be used with other string-related functions (e.g., `String.indexOf()`)
	+ Cons:
		- Less readable and maintainable, as it uses a more verbose syntax

**Library**

In this benchmark, no specific library is required or utilized. The test focuses solely on the performance comparison between two built-in JavaScript methods.

**Special JS Feature/Syntax**

None of the provided code utilizes special JavaScript features or syntax that would be unfamiliar to most software engineers.

**Other Considerations**

When considering these approaches, you may also want to think about:

* **Memory usage**: `JSON.parse()` can create a new object in memory, which might impact performance and memory usage for large JSON objects.
* **Readability and maintainability**: The choice of approach should be balanced with the need for easy understanding and modification of the code.

**Other Alternatives**

If you're interested in exploring alternative approaches or methods for extracting values from JSON objects, consider:

* **DOM traversal**: Using DOM methods (e.g., `document.getElementById()`, `getElementsByClassName()`) to access JSON data
* **JSON APIs**: Utilizing modern JSON APIs (e.g., `fetch()` with JSON response handling) for fetching JSON data

Keep in mind that these alternatives might not be as optimized or performant as the built-in methods used in this benchmark.

Related benchmarks:

JSON.parse vs String.substring for fetching one value (version: 0)

is it faster to get one value by JSON.parse() or directly via String.substring

Comparing performance of: JSON.parse() vs String.substring

Created: one year ago by: Guest

Jump to the latest result

JSON.parse()

String.substring

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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