Tested Competitors: datason, orjson, ujson, json
Typical API response with metadata
| Library | Mean (ms) | Min (ms) | Max (ms) | Std Dev (ms) | Success Rate |
|---|---|---|---|---|---|
| datason | 0.912 | 0.000 | 0.000 | 0.000 | 5/5 |
| json | 0.084 | 0.000 | 0.000 | 0.000 | 5/5 |
Simple data types common in APIs
| Library | Mean (ms) | Min (ms) | Max (ms) | Std Dev (ms) | Success Rate |
|---|---|---|---|---|---|
| datason | 0.047 | 0.000 | 0.000 | 0.000 | 5/5 |
| orjson | 0.001 | 0.000 | 0.000 | 0.000 | 5/5 |
| ujson | 0.003 | 0.000 | 0.000 | 0.000 | 5/5 |
| json | 0.007 | 0.000 | 0.000 | 0.000 | 5/5 |
Deeply nested data structures
| Library | Mean (ms) | Min (ms) | Max (ms) | Std Dev (ms) | Success Rate |
|---|---|---|---|---|---|
| datason | 0.092 | 0.000 | 0.000 | 0.000 | 5/5 |
| orjson | 0.001 | 0.000 | 0.000 | 0.000 | 5/5 |
| ujson | 0.006 | 0.000 | 0.000 | 0.000 | 5/5 |
| json | 0.014 | 0.000 | 0.000 | 0.000 | 5/5 |
Data with many datetime and UUID objects
| Library | Mean (ms) | Min (ms) | Max (ms) | Std Dev (ms) | Success Rate |
|---|---|---|---|---|---|
| datason | 0.387 | 0.000 | 0.000 | 0.000 | 5/5 |
| orjson | 0.009 | 0.000 | 0.000 | 0.000 | 5/5 |
| json | 0.108 | 0.000 | 0.000 | 0.000 | 5/5 |
{
"suite_type": "quick",
"metadata": {
"timestamp": "2025-06-17T07:17:02.272175+00:00",
"python_version": "3.11.12 (main, Apr 8 2025, 21:35:04) [GCC 13.3.0]",
"runner_info": {
"os": "posix",
"github_sha": "957745fb194516406ba7c28e8132cf8e97f575b6",
"github_ref": "refs/heads/main",
"ci_run_id": "15700700894"
}
},
"competitive": {
"api_response": {
"description": "Typical API response with metadata",
"serialization": {
"datason": {
"mean": 0.0009119851999685125,
"min": 0.0009015219999355395,
"max": 0.0009247750000440647,
"std": 1.1201548232836857e-05,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.9119851999685125
},
"orjson": {
"error": "All serialization attempts failed",
"error_count": 5
},
"ujson": {
"error": "All serialization attempts failed",
"error_count": 5
},
"json": {
"mean": 8.353399998668465e-05,
"min": 7.677400003558432e-05,
"max": 9.765200002220809e-05,
"std": 8.489744974047648e-06,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.08353399998668465
}
},
"deserialization": {
"datason": {
"mean": 0.046016347199997656,
"min": 0.042635515000029045,
"max": 0.05823740499999985,
"std": 0.006838687903983385,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 46.016347199997654
},
"json": {
"mean": 2.016739995269745e-05,
"min": 1.8744999920272676e-05,
"max": 2.2742000055586686e-05,
"std": 1.7356034920238797e-06,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.02016739995269745
}
},
"output_size": {
"datason": {
"size": 2720,
"size_type": "string chars",
"supports_binary": false
},
"orjson": {
"error": "Type is not JSON serializable: decimal.Decimal"
},
"ujson": {
"error": "datetime.datetime(2024, 1, 1, 12, 0, tzinfo=datetime.timezone.utc) is not JSON serializable"
},
"json": {
"size": 2760,
"size_type": "utf-8 bytes",
"supports_binary": false
}
},
"competitors_tested": [
"datason",
"orjson",
"ujson",
"json"
]
},
"simple_objects": {
"description": "Simple data types common in APIs",
"serialization": {
"datason": {
"mean": 4.7071800008779976e-05,
"min": 4.171800003405224e-05,
"max": 5.854900007307151e-05,
"std": 6.76539560251776e-06,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.047071800008779974
},
"orjson": {
"mean": 9.618000149203e-07,
"min": 7.310000000870787e-07,
"max": 1.3029999763602973e-06,
"std": 2.3617937330508575e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.0009618000149202999
},
"ujson": {
"mean": 2.7631999955701757e-06,
"min": 2.6249999791616574e-06,
"max": 3.0559999686374795e-06,
"std": 1.797670624215349e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.002763199995570176
},
"json": {
"mean": 6.6061999859812205e-06,
"min": 5.9509999346119e-06,
"max": 7.674000016777427e-06,
"std": 6.553046818627894e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.00660619998598122
}
},
"deserialization": {
"datason": {
"mean": 0.004772546800018063,
"min": 0.004751638000016101,
"max": 0.004808083000057195,
"std": 2.192539634994424e-05,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 4.772546800018063
},
"orjson": {
"mean": 1.6685999980836642e-06,
"min": 1.3620000345326844e-06,
"max": 2.243999915663153e-06,
"std": 3.600094067541442e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.001668599998083664
},
"ujson": {
"mean": 2.5907999770424796e-06,
"min": 2.3439999949914636e-06,
"max": 3.1359999184132903e-06,
"std": 3.3385428589798417e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.0025907999770424794
},
"json": {
"mean": 3.638599991973024e-06,
"min": 3.2060000876299455e-06,
"max": 4.4779999370803125e-06,
"std": 5.09718307231229e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.003638599991973024
}
},
"output_size": {
"datason": {
"size": 225,
"size_type": "string chars",
"supports_binary": false
},
"orjson": {
"size": 197,
"size_type": "bytes",
"supports_binary": true
},
"ujson": {
"size": 197,
"size_type": "utf-8 bytes",
"supports_binary": false
},
"json": {
"size": 225,
"size_type": "utf-8 bytes",
"supports_binary": false
}
},
"competitors_tested": [
"datason",
"orjson",
"ujson",
"json"
]
},
"nested_structures": {
"description": "Deeply nested data structures",
"serialization": {
"datason": {
"mean": 9.170700002414378e-05,
"min": 8.912600003441185e-05,
"max": 9.463700007472653e-05,
"std": 2.3934906355669823e-06,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.09170700002414378
},
"orjson": {
"mean": 1.358600002276944e-06,
"min": 1.0620000239214278e-06,
"max": 2.1939999896858353e-06,
"std": 4.7487028761337515e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.001358600002276944
},
"ujson": {
"mean": 5.652400045619288e-06,
"min": 5.379000072025519e-06,
"max": 6.101000053604366e-06,
"std": 2.7589635834536487e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.005652400045619288
},
"json": {
"mean": 1.4032200033398112e-05,
"min": 1.3295000030666415e-05,
"max": 1.507800004674209e-05,
"std": 8.240441091016208e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.014032200033398112
}
},
"deserialization": {
"datason": {
"mean": 0.01796288719999666,
"min": 0.017811231999985466,
"max": 0.018157858999984455,
"std": 0.00014693110352834935,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 17.962887199996658
},
"orjson": {
"mean": 3.2262000559057925e-06,
"min": 2.805000008265779e-06,
"max": 4.23800008775288e-06,
"std": 5.822123534412806e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.0032262000559057924
},
"ujson": {
"mean": 5.5783999641789705e-06,
"min": 5.048999923928932e-06,
"max": 6.741999982295965e-06,
"std": 6.887911936011962e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.0055783999641789705
},
"json": {
"mean": 7.1288000071945135e-06,
"min": 6.692000056318648e-06,
"max": 7.743999958620407e-06,
"std": 4.3680505343167436e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.0071288000071945135
}
},
"output_size": {
"datason": {
"size": 518,
"size_type": "string chars",
"supports_binary": false
},
"orjson": {
"size": 454,
"size_type": "bytes",
"supports_binary": true
},
"ujson": {
"size": 454,
"size_type": "utf-8 bytes",
"supports_binary": false
},
"json": {
"size": 518,
"size_type": "utf-8 bytes",
"supports_binary": false
}
},
"competitors_tested": [
"datason",
"orjson",
"ujson",
"json"
]
},
"datetime_heavy": {
"description": "Data with many datetime and UUID objects",
"serialization": {
"datason": {
"mean": 0.00038683519999267447,
"min": 0.0003774229999180534,
"max": 0.00039885399996819615,
"std": 7.858950366837525e-06,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.38683519999267446
},
"orjson": {
"mean": 9.262999992643017e-06,
"min": 8.716000024833193e-06,
"max": 1.0459999998602143e-05,
"std": 7.268136005559869e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.009262999992643017
},
"ujson": {
"error": "All serialization attempts failed",
"error_count": 5
},
"json": {
"mean": 0.00010809559996687313,
"min": 0.0001039239999727215,
"max": 0.00011923299996396963,
"std": 6.2978797437057175e-06,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.10809559996687312
}
},
"deserialization": {
"datason": {
"mean": 0.02517282139999679,
"min": 0.025042681999934757,
"max": 0.025280355999939275,
"std": 9.578496570332021e-05,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 25.172821399996792
},
"orjson": {
"mean": 6.984600031501032e-06,
"min": 6.4609999981257715e-06,
"max": 7.914000093478535e-06,
"std": 5.958047762138996e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.0069846000315010315
},
"json": {
"mean": 1.296580003327108e-05,
"min": 1.2473000083446095e-05,
"max": 1.3865000028090435e-05,
"std": 5.716617895554581e-07,
"successful_runs": 5,
"error_count": 0,
"mean_ms": 0.01296580003327108
}
},
"output_size": {
"datason": {
"size": 3102,
"size_type": "string chars",
"supports_binary": false
},
"orjson": {
"size": 2937,
"size_type": "bytes",
"supports_binary": true
},
"ujson": {
"error": "datetime.datetime(2024, 1, 1, 12, 0, tzinfo=datetime.timezone.utc) is not JSON serializable"
},
"json": {
"size": 3102,
"size_type": "utf-8 bytes",
"supports_binary": false
}
},
"competitors_tested": [
"datason",
"orjson",
"ujson",
"json"
]
},
"summary": {
"competitors_tested": [
"datason",
"orjson",
"ujson",
"json"
],
"datasets_tested": [
"api_response",
"simple_objects",
"nested_structures",
"datetime_heavy"
],
"fastest_serialization": {
"api_response": {
"library": "json",
"time_ms": 0.08353399998668465
},
"simple_objects": {
"library": "orjson",
"time_ms": 0.0009618000149202999
},
"nested_structures": {
"library": "orjson",
"time_ms": 0.001358600002276944
},
"datetime_heavy": {
"library": "orjson",
"time_ms": 0.009262999992643017
}
},
"fastest_deserialization": {
"api_response": {
"library": "json",
"time_ms": 0.02016739995269745
},
"simple_objects": {
"library": "orjson",
"time_ms": 0.001668599998083664
},
"nested_structures": {
"library": "orjson",
"time_ms": 0.0032262000559057924
},
"datetime_heavy": {
"library": "orjson",
"time_ms": 0.0069846000315010315
}
},
"smallest_output": {
"api_response": {
"library": "datason",
"size_bytes": 2720
},
"simple_objects": {
"library": "orjson",
"size_bytes": 197
},
"nested_structures": {
"library": "orjson",
"size_bytes": 454
},
"datetime_heavy": {
"library": "orjson",
"size_bytes": 2937
}
},
"datason_performance": {
"api_response": {
"serialization_ms": 0.9119851999685125,
"deserialization_ms": 46.016347199997654
},
"simple_objects": {
"serialization_ms": 0.047071800008779974,
"deserialization_ms": 4.772546800018063
},
"nested_structures": {
"serialization_ms": 0.09170700002414378,
"deserialization_ms": 17.962887199996658
},
"datetime_heavy": {
"serialization_ms": 0.38683519999267446,
"deserialization_ms": 25.172821399996792
}
}
}
}
}