How to Serialize and Deserialize Line Delimited JSON (LDJSON) in C#?

Serialization and Deserialization of Line Delimited JSON (LDJSON) in C#

Understanding this process is critical when you need to serialize and deserialize objects into row-delimited JSON (LDJSON) format (commonly used in Google BigQuery data preparation). LDJSON represents data as a series of newline-delimited JSON objects.

Manually parse LDJSON data

JsonTextReader in Json.NET provides a way to manually parse LDJSON data. JsonTextReader can handle contiguous JSON objects by setting the SupportMultipleContent flag to true.

First JSON example (simple object)

Consider the following LDJSON data:

<code>{"some":"thing1"}
{"some":"thing2"}
{"some":"thing3"}</code>

The analysis method is as follows:

<code class="language-csharp">var json = "{\"some\":\"thing1\"}\r\n{\"some\":\"thing2\"}\r\n{\"some\":\"thing3\"}";
var jsonReader = new JsonTextReader(new StringReader(json))
{
    SupportMultipleContent = true // 允许多个JSON对象
};

var jsonSerializer = new JsonSerializer();
while (jsonReader.Read())
{
    var foo = jsonSerializer.Deserialize<foo>(jsonReader);
}</code>

Second JSON example (nested object)

For more complex JSON:

<code class="language-json">{"kind": "person", "fullName": "John Doe", "age": 22, "gender": "Male", "citiesLived": [{ "place": "Seattle", "numberOfYears": 5}, {"place": "Stockholm", "numberOfYears": 6}]}
{"kind": "person", "fullName": "Jane Austen", "age": 24, "gender": "Female", "citiesLived": [{"place": "Los Angeles", "numberOfYears": 2}, {"place": "Tokyo", "numberOfYears": 2}]}</code>

Using the same approach, add each deserialized object to the list:

<code class="language-csharp">var json = "{...}"; // 定义JSON字符串
var jsonReader = new JsonTextReader(new StringReader(json)) { SupportMultipleContent = true };
var jsonSerializer = new JsonSerializer();
var listOfPeople = new List<person>();

while (jsonReader.Read())
{
    listOfPeople.Add(jsonSerializer.Deserialize<person>(jsonReader));
}</code>

Note: Json.Net 10.0.4 and above also supports comma-separated JSON entries, providing additional flexibility.

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