How to Serialize and Deserialize Line-Delimited JSON (LDJSON) in C# using JSON.NET?

Using JSON.NET to process line-delimited JSON (LDJSON) in C#

In some applications, such as Google BigQuery, the line-delimited JSON (LDJSON) format is required. This format separates each JSON object with a newline character, allowing for efficient data import.

How to serialize and deserialize LDJSON

The popular C# JSON library JSON.NET provides a solution to the LDJSON problem. You can parse LDJSON data manually by using JsonTextReader and setting the SupportMultipleContent flag to true.

Serialization example

For lists of objects, you can serialize each object individually and concatenate them into a single LDJSON string.

Deserialization example

To deserialize LDJSON data, create a reader using JsonTextReader and iterate through these objects, deserializing each object to the corresponding object type.

Code example (pseudocode, needs to be adjusted according to the actual object type):

while (jsonReader.Read())
{
  Foo foo = jsonSerializer.Deserialize<Foo>(jsonReader);
  jsonList.Add(foo); 
}

If your desired result is a list of objects, you can add each deserialized object to the list in a loop.

Support for comma separated JSON

With Json.Net 10.0.4 and above, the provided code also supports comma-separated JSON entries. This makes working with JSON data format more flexible.

Summary

This method provides a straightforward mechanism for serializing and deserializing LDJSON data using JSON.NET in C#. By setting the SupportMultipleContent flag, you can efficiently handle multiple JSON objects in a single stream.

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