https://github.com/quanvo87/jsonperf

Performance comparison of JSONDecoder and JSONSerializaton.
https://github.com/quanvo87/jsonperf

decoding json json-serialization swift-evolution swiftyjson

Last synced: about 1 month ago
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Performance comparison of JSONDecoder and JSONSerializaton.

• Host: GitHub
• URL: https://github.com/quanvo87/jsonperf
• Owner: quanvo87
• Created: 2017-05-22T04:35:15.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2017-07-25T02:45:06.000Z (almost 9 years ago)
• Last Synced: 2025-05-29T06:43:49.337Z (about 1 year ago)
• Topics: decoding, json, json-serialization, swift-evolution, swiftyjson
• Language: Swift
• Homepage:
• Size: 896 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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# jsonPerf

Performance comparison of `JSONDecoder` and `JSONSerializaton` decoding and returning a struct from a 7 MB JSON.

- [swift-evolution/0166](https://github.com/apple/swift-evolution/blob/master/proposals/0166-swift-archival-serialization.md)

- [swift-evolution/0167](https://github.com/apple/swift-evolution/blob/master/proposals/0167-swift-encoders.md)

![macOS](https://github.com/quanvo87/jsonPerf/blob/master/Assets/macOS.png?)

macOS: `JSONEncoder` was 10.95% *slower* than `JSONSerialization` + object mapping.

![Linux](https://github.com/quanvo87/jsonPerf/blob/master/Assets/Linux.png?)

Linux: `JSONEncoder` was 0.28% *faster* than `JSONSerialization` + object mapping.

### Notes

The `JSONEncoder` bars show performance of `decoder.decode()` where `decoder` is a previously instantiated `JSONDecoder`.

The `JSONSerialization` bars show the total performance of `JSONSerialization.jsonObject`, a cast of that return value to `[String: Any]`, and then instantiating a struct from that dictionary.

## Credits

Borrowed ideas from [JSONShootout](https://github.com/bwhiteley/JSONShootout). Also using their large JSON file.