JsonUtils

public static class JsonUtils
{
    /// <summary>
    /// Indent a string containing a valid Json
    /// </summary>
    /// <param name="json"></param>
    /// <returns></returns>
    /// <exception cref="ArgumentNullException"></exception>
    public static async Task<string> GetIndentedAsync(string json)
    {
        if (json is null) throw new ArgumentNullException(nameof(json));

        var jsonOpts = new JsonWriterOptions()
        {
            Indented = true, 
            SkipValidation = true, 
            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
        };
        var buffer = new ArrayBufferWriter<byte>();
        using var jsonDoc = JsonDocument.Parse(json);
        await using var jsonWriter = new Utf8JsonWriter(buffer, jsonOpts);

        jsonDoc.WriteTo(jsonWriter);
        await jsonWriter.FlushAsync();

        return Encoding.UTF8.GetString(buffer.WrittenMemory.ToArray());
    }

    /// <inheritdoc cref="GetIndentedAsync"/>
    public static string GetIndented(string json) => GetIndentedAsync(json).GetAwaiter().GetResult();
}