Question 1

How does SystemTextJson.JsonDiffPatch compare to jsondiffpatch.net?

Accepted Answer

SystemTextJson.JsonDiffPatch is built on System.Text.Json for better performance and modern .NET integration, while jsondiffpatch.net uses Newtonsoft.Json. It's ideal if you're migrating to System.Text.Json, but lacks some legacy Newtonsoft features.

Question 2

How to diff JSON files with this library?

Accepted Answer

Use the JsonDiffPatcher.DiffFile method to directly compare JSON files, as shown in the examples. It handles file reading and diffing efficiently, supporting various input sources like streams and spans.

Question 3

Can it handle semantic comparison of dates and numbers?

Accepted Answer

Yes, through JsonValueComparer and DeepEquals with JsonElementComparison.Semantic, it treats equivalent values like "1" and "1.00" or date strings as equal, useful for accurate JSON equality checks.

Question 4

Is there support for custom diff algorithms?

Accepted Answer

The library allows writing custom diff algorithms, such as for text diffing, but note that this is limited when using RFC 6902 format, as mentioned in the features section.

Question 5

How to integrate with xUnit for JSON assertions?

Accepted Answer

Install the SystemTextJson.JsonDiffPatch.Xunit package and use methods like JsonAssert.Equal, which provides detailed diff output on test failures, making debugging easier in unit tests.

Question 6

What are the performance benchmarks for large JSON?

Accepted Answer

The project includes benchmark results showing fast diffing with low memory consumption for large documents, detailed in Benchmark.md, highlighting its optimization for performance-critical applications.

Question 7

Does it support diffing from streams or spans?

Accepted Answer

Yes, it supports diffing from various inputs including streams, spans, and JsonNode, offering flexibility for different data sources, as demonstrated in the Diff method examples.

SystemTextJson.JsonDiffPatch

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