In .NET 5, you can preserve references for circular references using System.Text.Json.

But you couldn't ignore them. The 'JsonException' is thrown if circular references have been detected.

In .NET 6, you can ignore them \U0001f642#dotnet6 #json #coding #devcommunity pic.twitter.com/FnvR8gjwvN

— Oleg Kyrylchuk (@okyrylchuk) October 6, 2021

In .NET 6, System.Text.Json exposes notifications for (de)serialization.

There are four new interfaces to implement according to your needs:
\u2022 IJsonOnDeserialized
\u2022 IJsonOnDeserializing
\u2022 IJsonOnSerialized
\u2022 IJsonOnSerializing#dotnet6 #json #coding #devcommunity pic.twitter.com/iYpzHsg8Hy

— Oleg Kyrylchuk (@okyrylchuk) October 7, 2021

In .NET 6, the 'JsonPropertyOrderAttribute' has been added to System.Text.Json.

It allows controlling the serialization order of properties.

Previously, the serialization order was determined by reflection order.#dotnet6 #json #coding #devcommunity pic.twitter.com/5sBJRWOvcX

— Oleg Kyrylchuk (@okyrylchuk) October 8, 2021

.NET 6 introduces the possibility to write 'raw' #json with System.Text.Json.Utf8JsonWriter.

Useful when you want:
\u2022 to enclose existing JSON in new JSON
\u2022 to format values differently from the default formatting#dotnet6 #coding #devcommunity pic.twitter.com/NguR3wEOAM

— Oleg Kyrylchuk (@okyrylchuk) October 16, 2021