JSON patch generation and application built on top of Json Document.
This library was created as as an alternative to the more complete jsondiffpatch.net built on .NET 5 native JSON parsing, rather than JSON.Net. System.Text.Json provides considerable performance improvements over JSON.Net.
var left = @"{ ""key"": false }";
var right = @"{ ""key"": true }";
PatchList path = JsonComparer.Compare(left.AsMemory(), right.AsMemory());
Note JsonComparer compares the memory first, and only if not equal will it parse and walk the JSON document looking for differences.
Generate a patch list given two JSON documents:
var left = JsonDocument.Parse(@"{ ""key"": false }");
var right = JsonDocument.Parse(@"{ ""key"": true }");
PatchList path = left.CompareWith(right);
Apply a given patch list to a json document:
var left = JsonDocument.Parse(@"{ ""key"": false }");
var right = JsonDocument.Parse(@"{ ""key"": true }");
var memoryStream = new MemoryStream();
var jsonWriter = new Utf8JsonWriter(memoryStream);
left.CompareWith(right)
.ApplyPatch(left, jsonWriter);
This libaries usage of .NET 5 System.Text.Json primites offer a performance improvement over the jsondiffpatch.net implementation:
| Method | Categories | Mean | Error | StdDev | Ratio | RatioSD | Gen 0 | Gen 1 | Allocated |
|------------------------------------------------ |----------------------- |------------:|-----------:|----------:|------:|--------:|---------:|---------:|------------:|
| UTF8Diff_HasDifferences | Diff | 94.49 us | 1.889 us | 1.855 us | 0.02 | 0.00 | 13.6719 | 1.0986 | 85,800 B |
| JsonPatchDiff_HasDifferences | Diff | 5,447.68 us | 78.325 us | 73.265 us | 1.00 | 0.00 | 250.0000 | 62.5000 | 1,607,548 B |
| | | | | | | | | | |
| UTF8Diff_Parse_HasDifferences | Parse + Diff | 191.31 us | 2.159 us | 2.019 us | 0.03 | 0.00 | 20.0195 | 3.6621 | 127,016 B |
| JsonPatchDiff_Parse_HasDifferences | Parse + Diff | 5,715.38 us | 105.890 us | 93.869 us | 1.00 | 0.00 | 281.2500 | 109.3750 | 1,807,396 B |
| | | | | | | | | | |
| UTF8Diff_ApplyPatch | Apply Patch | 130.92 us | 2.566 us | 2.746 us | 0.20 | 0.01 | 12.4512 | 1.2207 | 79,608 B |
| JsonPatchDiff_ApplyPatch | Apply Patch | 644.88 us | 12.762 us | 20.242 us | 1.00 | 0.00 | 77.1484 | 18.5547 | 488,969 B |
| | | | | | | | | | |
| UTF8Diff_NoDifferences | No differences | 75.68 us | 1.384 us | 1.699 us | 6.25 | 0.24 | 11.1084 | 0.1221 | 70,080 B |
| JsonPatchDiff_NoDifferences | No differences | 12.09 us | 0.239 us | 0.327 us | 1.00 | 0.00 | 0.4883 | - | 3,072 B |
| | | | | | | | | | |
| IncludesJsonParsing_UTF8Diff_NoDifferences | Parse + no differences | 21.67 us | 0.428 us | 0.440 us | 0.11 | 0.00 | 0.0305 | - | 272 B |
| IncludesJsonParsing_JsonPatchDiff_NoDifferences | Parse + no differences | 194.36 us | 3.612 us | 4.300 us | 1.00 | 0.00 | 27.5879 | 9.0332 | 173,936 B |