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Closes #556 Implement JSON serialization support for Deedle data frames, supporting three orientation modes (mirroring pandas to_json): - "columns" (default): column-major {"col":{"row":v,...},...} - "index": row-major {"row":{"col":v,...},...} - "records": array of row objects [{"col":v,...},...] New API surface: - F# module: Frame.toJson orient frame, Frame.saveJson path frame - F# extension methods: frame.ToJson(?orient), frame.SaveJson(writer,?orient), frame.SaveJson(path,?orient) - C# static extension methods: Frame.ToJson(frame,orient), Frame.SaveJson(frame,writer,orient), Frame.SaveJson(frame,path,orient) Implementation notes: - No new dependencies; JSON is written with a simple manual TextWriter approach - float/float32 NaN and Infinity serialize as null (consistent with pandas default) - DateTime/DateTimeOffset keys and values use ISO 8601 round-trip format ("o") - All string keys and values are properly escaped per the JSON spec - OptionalValue<T> column types are unwrapped (consistent with SaveCsv) Co-authored-by: Copilot <[email protected]>
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🤖 Repo Assist — automated AI implementation in response to maintainer request.
Closes #556
Summary
Implements JSON serialization for Deedle data frames, mirroring pandas'
to_jsonAPI. No new dependencies are introduced — JSON is written using a simpleTextWriter-based approach.New API
F# module functions
F# extension methods
C# static methods
Built and tested on Linux with
dotnet test tests/Deedle.Tests/Deedle.Tests.fsproj -c Release.