Jackson - Marshall String to JsonNode

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1. Overview

This quick tutorial will show how to use Jackson 2 to convert a JSON String to a JsonNode (com.fasterxml.jackson.databind.JsonNode).

If you want to dig deeper and learn other cool things you can do with the Jackson 2 – head on over to the main Jackson tutorial.

2. Quick Parsing

Very simply, to parse the JSON String we only need an ObjectMapper:

@Test
public void whenParsingJsonStringIntoJsonNode_thenCorrect() 
  throws JsonParseException, IOException {
    String jsonString = "{\"k1\":\"v1\",\"k2\":\"v2\"}";

    ObjectMapper mapper = new ObjectMapper();
    JsonNode actualObj = mapper.readTree(jsonString);

    assertNotNull(actualObj);
}

3. Low Level Parsing

If, for some reason, you need to go lower level than that, the following example exposes the JsonParser responsible with the actual parsing of the String:

@Test
public void givenUsingLowLevelApi_whenParsingJsonStringIntoJsonNode_thenCorrect() 
  throws JsonParseException, IOException {
    String jsonString = "{\"k1\":\"v1\",\"k2\":\"v2\"}";

    ObjectMapper mapper = new ObjectMapper();
    JsonFactory factory = mapper.getFactory();
    JsonParser parser = factory.createParser(jsonString);
    JsonNode actualObj = mapper.readTree(parser);

    assertNotNull(actualObj);
}

4. Using the JsonNode

After the JSON is parsed into a JsonNode Object, we can work with the Jackson JSON Tree Model:

@Test
public void givenTheJsonNode_whenRetrievingDataFromId_thenCorrect() 
  throws JsonParseException, IOException {
    String jsonString = "{\"k1\":\"v1\",\"k2\":\"v2\"}";
    ObjectMapper mapper = new ObjectMapper();
    JsonNode actualObj = mapper.readTree(jsonString);

    // When
    JsonNode jsonNode1 = actualObj.get("k1");
    assertThat(jsonNode1.textValue(), equalTo("v1"));
}

5. Conclusion

This article illustrated how to parse JSON Strings into the Jackson JsonNode model to enable a structured processing of the JSON Object.

The code backing this article is available on GitHub. Once you're logged in as a Baeldung Pro Member, start learning and coding on the project.

Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.

To learn more about Java features on Azure Container Apps, visit the documentation page.

You can also ask questions and leave feedback on the Azure Container Apps GitHub page.

Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.

Try a 14-Day Free Trial of Orkes Conductor today.

Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.

Try a 14-Day Free Trial of Orkes Conductor today.