Benchmark: Json.stringify + TextEncode vs StructuredClone

Script Preparation code:

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var obj = {
  description: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

var clone;
var encoder = new TextEncoder()

Tests:

json.stringify + TextEncode
clone = encoder.encode(JSON.stringify(myObject))
structuredClone
clone = structuredClone(myObject)
json.stringify
clone = JSON.stringify(myObject)
JSON
clone = JSON.parse(JSON.stringify(myObject))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
json.stringify + TextEncode
structuredClone
json.stringify
JSON

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
json.stringify + TextEncode	23395.0 Ops/sec
structuredClone	20914.8 Ops/sec
json.stringify	46009.6 Ops/sec
JSON	17237.9 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 5 days ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the provided JSON evaluates the performance of different methods of copying or serializing JavaScript objects. Specifically, it compares four distinct approaches:

1. **JSON.stringify + TextEncode**
   - **Benchmark Definition**: This approach uses `JSON.stringify(obj)` to convert the JavaScript object into a JSON string and then uses the **TextEncoder** to encode that string into a `Uint8Array`.
   - **Pros**:
     - This method offers a two-step conversion that results in an array of bytes, useful when binary data is required.
   - **Cons**:
     - The combination of two operations may introduce overhead, potentially making it slower than other simpler methods.
     - It is limited to serializable data types; it cannot handle functions, undefined, or circular references.

2. **structuredClone**
   - **Benchmark Definition**: This method uses the `structuredClone(obj)` function introduced in modern JavaScript, which allows deep cloning of JavaScript objects, handling complex structures and data types including Dates, Maps, Sets, and cyclic references.
   - **Pros**:
     - It is capable of cloning more complex data types.
     - It handles circular references and does not throw errors as compared to JSON methods.
   - **Cons**:
     - Being a newer feature, it may not be available in older browsers or environments, potentially affecting cross-browser compatibility. Also, some developers may not be familiar with this API in older codebases.

3. **JSON.stringify**
   - **Benchmark Definition**: Calls `JSON.stringify(obj)` on its own to convert the object into a JSON string representation.
   - **Pros**:
     - This method is straightforward and very commonly used, making it familiar for many developers.
     - Fast for flat objects and data that conform to JSON's serialization requirements.
   - **Cons**:
     - Again, it cannot handle non-serializable types (functions, undefined, etc.) and loses reference to these types in the final output.

4. **JSON.parse(JSON.stringify(obj))**
   - **Benchmark Definition**: It serializes the object into a JSON string with `JSON.stringify()` and then parses it back into an object with `JSON.parse()`, effectively creating a deep copy.
   - **Pros**:
     - This creates a full clone of objects for manageable, serializable data. 
     - It is a widely compatible solution available in all JavaScript environments.
   - **Cons**:
     - This method fails with functions, undefined values, and cyclic dependencies, similar to the standard `JSON.stringify()`.
     - It can introduce performance overhead with the dual operations of stringify and parse.

### Benchmark Results
The benchmark results show the number of executions per second for each cloning method:

- **JSON.stringify**: 2,144,734.25 executions per second (fastest)
- **JSON.parse(JSON.stringify(obj))**: 1,021,799.81 executions per second
- **JSON.stringify + TextEncode**: 566,624.69 executions per second
- **structuredClone**: 451,088.78 executions per second (slowest)

### Considerations and Alternatives
Depending on the use case, engineers should choose the appropriate method for object cloning:

- **Use Cases for JSON Methods**: If data needs to be converted into a format suitable for transmission (e.g., API requests), using `JSON.stringify` is appropriate. For cloning simple objects where performance matters, `JSON.parse(JSON.stringify(obj))` can work effectively, but with the caveat of not handling non-serializable data.
  
- **Use Cases for structuredClone**: If data structures include complex types or require handling of cyclic references, `structuredClone` is the best modern solution if browser compatibility allows.

Alternatives to these cloning strategies may involve using libraries like Lodash (with `_.cloneDeep(obj)`) or other serialization libraries that can handle a broader range of data types and are often optimized for performance.

Related benchmarks:

Json.stringify + TextEncode vs StructuredClone (version: 6)

Comparing performance of: json.stringify + TextEncode vs structuredClone vs json.stringify vs JSON

Created: 5 days ago by: Registered User

Jump to the latest result

json.stringify + TextEncode

structuredClone

json.stringify

JSON

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 5 days ago):