Benchmark: JSON.stringify vs string concat simple

Script Preparation code:

var testData = {};

for (let i = 0; i < 1000; i++) {
 testData[i.toString()] = "bla" + i; 
}

Tests:

JSON.stringify
const data = JSON.stringify(testData);
string concat
let str = "{"; Object.keys(testData).forEach((k) => { str += "\"".concat(k).concat("\":\"").concat(testData[k]).concat("\","); }); str = str.substring(0, str.length - 1); str += "}";

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON.stringify
string concat

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents a benchmark test case that compares two approaches for serializing an object to a string: `JSON.stringify()` and manual string concatenation.

**What is tested?**

In this benchmark, we're testing how efficiently different browsers can concatenate strings. The test case creates a large object `testData` with 1000 properties, each containing the string "bla" followed by the property's value (the loop counter).

The two test cases measure the execution time of serializing the `testData` object using:

1. **JSON.stringify()**: This method converts an object to a JSON string.
2. **Manual string concatenation**: This approach uses a loop to concatenate strings together.

**Options compared**

The benchmark compares the performance of these two approaches, focusing on how quickly they can serialize the large `testData` object.

**Pros and cons of each approach:**

1. **JSON.stringify()**
	* Pros:
		+ More concise and readable code
		+ Less error-prone ( automatic escaping of special characters)
		+ Faster execution time (since it uses a built-in, optimized function)
	* Cons:
		+ May be slower than manual string concatenation in very large datasets
2. **Manual string concatenation**
	* Pros:
		+ Can be faster for very large datasets (since it avoids the overhead of JSON.stringify())
		+ More control over the serialization process
	* Cons:
		+ Less readable and maintainable code (due to the need for explicit string concatenation)
		+ More error-prone (manual escaping of special characters)

**Library used**

The `JSON` library is used in the `JSON.stringify()` method. The `JSON` object provides a way to serialize objects to strings, with options like pretty-printing and escaping.

**Special JS feature or syntax**

There isn't any specific JavaScript feature or syntax mentioned in this benchmark. However, it's worth noting that the use of `Object.keys()` and `forEach()` is a relatively modern JavaScript feature (introduced in ECMAScript 2015).

**Other alternatives**

For serializing objects to strings, you could also consider using:

* **JSON.parse(JSON.stringify(obj))**: This method can be used to serialize an object to a string, but it may not be as efficient as `JSON.stringify()`.
* **String.fromCharCode() + ... + String.fromCharCode()**: Another way to concatenate strings together, although less readable and maintainable than manual string concatenation or `JSON.stringify()`.

Keep in mind that the performance differences between these approaches can vary depending on the specific use case, browser, and dataset size.

Related benchmarks:

JSON.stringify vs string concat simple (version: 0)

Comparing performance of: JSON.stringify vs string concat

Created: 4 years ago by: Registered User

Jump to the latest result

JSON.stringify

string concat

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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