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JsonFold for .NET

Single-package .NET implementation of JSONFold using the standard System.Text.Json serializer.

It mirrors the Java/Python/JavaScript design:

• JsonFoldConfig: immutable config and presets (default, none, classic, low, med, high, max, pack, fold, grid, join).
• JsonFoldWriter: TextWriter filter for already pretty-printed JSON.
• JsonFoldFormatter: object-to-JSON API using System.Text.Json with WriteIndented = true, then JSONFold filtering.
• JsonFoldStats: bytes/lines in/out.

Quick start

using JsonFold;

var data = new {
    meta = new { version = 1, ok = true, name = "jsonfold demo" },
    ids = new[] { 1, 2, 3, 4, 5, 6 },
    matrix = new[] {
        new object[] { 1, 20, "Red", 300 },
        new object[] { 4000, 50, "Yellow", 6 },
        new object[] { 70, 800, "Green", 9000 },
    }
};

string text = JsonFold.JsonFold.FormatJson(data, width: 100, config: JsonFoldConfig.Preset("default"));
Console.WriteLine(text);

Write to a stream

var stats = JsonFold.JsonFold.WriteJson(data, Console.Out, width: 120, config: JsonFoldConfig.Preset("high"));
Console.Error.WriteLine(stats);

Fold existing pretty JSON

string folded = JsonFold.JsonFold.FoldText(prettyJson, width: 100, config: JsonFoldConfig.Preset("max"));

Notes

This package intentionally does not split into Jackson/Gson-style modules. .NET has one standard serializer target here: System.Text.Json.

Unlike Java's serializer integrations, this first serializes through JsonSerializer.Serialize(..., WriteIndented = true) and then folds the text. The JsonFoldWriter itself is streaming for text input, but System.Text.Json object serialization is currently string-based in this small package.