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Convert JSON to CSV in Java

In this tutorial, we'll explore how to convert JSON data to CSV format using Java's built-in libraries.

Understanding JSON and CSV

Let's begin by understanding the two key players: JSON and CSV.

JSON (JavaScript Object Notation) is a lightweight data format for easy data exchange between systems.

CSV (Comma-Separated Values) is a simple tabular format often used for data storage and analysis.

Using Java Libraries

To achieve this conversion, we'll use Java's standard libraries.

Step 1: JSON Data Preparation

Let's assume we have JSON data representing hero attributes:

[
    {
        "name": "Aldric the Brave",
        "power": "Courage",
        "level": 42
    },
    {
        "name": "Lyra the Wise",
        "power": "Knowledge",
        "level": 38
    },
    {
        "name": "Faelan the Swift",
        "power": "Speed",
        "level": 45
    }
]

Step 2: Conversion with Java

Let's write Java code to convert JSON to CSV:


import org.json.JSONArray;
import org.json.JSONObject;

import java.io.FileWriter;
import java.io.IOException;

public class JsonToCsvConverter {

    public static void main(String[] args) {
        JSONArray heroesData = new JSONArray("[...]"); // Replace with your JSON data

        try (FileWriter csvWriter = new FileWriter("heroes.csv")) {
            csvWriter.append("name,power,level\\n");

            for (Object heroObj : heroesData) {
                JSONObject hero = (JSONObject) heroObj;
                csvWriter.append(hero.getString("name"))
                        .append(",").append(hero.getString("power"))
                        .append(",").append(String.valueOf(hero.getInt("level")))
                        .append("\\n");
            }

            csvWriter.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Step 3: Transformation Complete

Your JSON data is now transformed into a structured CSV format.

Conclusion

You've learned how to convert JSON to CSV using Java's libraries. This skill is valuable for data processing tasks.

If you prefer an automated solution, you can use our tool.