This post explains how to get json parser default settings.

import java.io.File;
import java.io.IOException;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonParser.Feature;

public class ProcessingDemo2 {
    public static void main(String[] args) throws JsonParseException, IOException {
        File file = new File("jsondata.json");
        JsonFactory jsonFactory = new JsonFactory();
        JsonParser jsonParser = jsonFactory.createParser(file);
        for(Feature feature : Feature.values()) {
            System.out.println(feature.name() + ":" + jsonParser.isEnabled(feature));
        }
    }
}

All the settings of a JSON Parser are represented as JsonParser.Feature enum. Feature.values() will return all the features that are available for JSONParser but whether a feature is enabled or disabled for a particular parser is determined by using the below code

jsonParser.isEnabled(feature);

where ‘jsonParser’ is particular instance of JSONParser and ‘feature’ is one of the JSONParser.Feature enum values.

Output

AUTO_CLOSE_SOURCE:true
ALLOW_COMMENTS:false
ALLOW_YAML_COMMENTS:false
ALLOW_UNQUOTED_FIELD_NAMES:false
ALLOW_SINGLE_QUOTES:false
ALLOW_UNQUOTED_CONTROL_CHARS:false
ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER:false
ALLOW_NUMERIC_LEADING_ZEROS:false
ALLOW_NON_NUMERIC_NUMBERS:false
STRICT_DUPLICATE_DETECTION:false
IGNORE_UNDEFINED:false