Bson Document to Json in Java

Sadly, IMO, MongoDB Java support is broken.

That said, there is a @deprecated class in the mongo-java-driver that you can use:

String json = com.mongodb.util.JSON.serialize(document);
System.out.println("JSON serialized Document: " + json);

I'm using this to produce fasterxml (jackson) compatible JSON from a Document object that I can deserialize via new ObjectMapper().readValue(json, MyObject.class).

However, I'm not sure what they expect you to use now that the JSON class is deprecated. But for the time being, it is still in the project (as of v3.4.2).

I'm importing the following in my pom:

<dependency>
  <groupId>org.mongodb</groupId>
  <artifactId>mongodb-driver-async</artifactId>
  <version>3.4.2</version>
</dependency>
<!-- Sadly, we need the mongo-java-driver solely to serialize
     Document objects in a sane manner -->
<dependency>
  <groupId>org.mongodb</groupId>
  <artifactId>mongo-java-driver</artifactId>
  <version>3.4.2</version>
</dependency>

I'm using the async driver for actually fetching and pushing updates to mongo, and the non-async driver solely for the use of the JSON.serialize method.

No, it is not possible to produce the plain JSON. Please refer this link.

However, it can produce JSON in two modes.

1) Strict mode - Output that you have already got

2) Shell mode

Shell Mode:-

JsonWriterSettings writerSettings = new JsonWriterSettings(JsonMode.SHELL, true);           
System.out.println(doc.toJson(writerSettings));

Output:-

"createdOn" : ISODate("2016-07-16T16:26:51.951Z")

MongoDB Extended JSON

In theory we are supposed to use toJSON() per... https://jira.mongodb.org/browse/JAVA-1770

However, it seems that, at least up through 3.6, toJSON() isn't supported on various types the old JSON.serialize() method handled without issue, such as the AggregateIterable<Document> objects output by aggregate().