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  1. 123

    Converting a JSON file to a CSV file in Java can be achieved using libraries like Jackson or org.json. Below are two common methods to perform this task.

    Method 1: Using Jackson Library

    • Add Dependencies Include the following dependencies in your pom.xml:

    <dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-csv</artifactId>
    <version>2.13.0</version>
    </dependency>
    <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.0</version>
    </dependency>
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    • Implementation Use ObjectMapper and CsvMapper to read JSON and write CSV:

    import com.fasterxml.jackson.databind.JsonNode;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import com.fasterxml.jackson.dataformat.csv.CsvMapper;
    import com.fasterxml.jackson.dataformat.csv.CsvSchema;

    import java.io.File;

    public class JsonToCsv {
    public static void main(String[] args) throws Exception {
    // Read JSON file into JsonNode
    JsonNode jsonTree = new ObjectMapper().readTree(new File("input.json"));

    // Build CSV schema from JSON fields
    CsvSchema.Builder csvSchemaBuilder = CsvSchema.builder();
    jsonTree.elements().next().fieldNames().forEachRemaining(csvSchemaBuilder::addColumn);
    CsvSchema csvSchema = csvSchemaBuilder.build().withHeader();

    // Write CSV file
    CsvMapper csvMapper = new CsvMapper();
    csvMapper.writerFor(JsonNode.class)
    .with(csvSchema)
    .writeValue(new File("output.csv"), jsonTree);
    }
    }
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  2. GeeksForGeeks
    https://www.geeksforgeeks.org › java › how-to-write-json-arr…

    How to Write JSON Array to CSV File using Java?

    Apr 14, 2025 · This JSON in many scenarios is an array of objects, and thus, converting it to CSV makes it easily readable and comprehendible by people from …

  3. Baeldung
    https://www.baeldung.com › java-converting-json-to-csv

    Converting JSON to CSV in Java - Baeldung

    In this short tutorial, we’ll see how to use Jackson to convert JSON into CSV and vice versa. There are alternative libraries available, like theCDL class from org.json, but we’ll just focus on the Jackson library here. After we’ve looked at our example data structure, we’ll use a combination of ObjectMapperand CSVMapper to convert between JSON and...
    See more on baeldung.com
    • Published: Jun 15, 2019
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