Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
JSON to Java Class
Generate Java POJO class definitions from JSON data — with getters, setters, and constructors
- Home
- /
- JSON to Java Class
Options
Generated Java Code
import lombok.Data;
@Data
public class User {
private int id;
private String name;
private String email;
}Classes
0
Fields
0
Style
-
Nesting
0
What Is a Java POJO?
A POJO (Plain Old Java Object) is a simple Java class with private fields and public getters/setters. It's the foundation for data transfer objects, entity classes, and models in Java applications. With Lombok annotations, you can eliminate boilerplate code.
How to Use
- Paste JSON — Enter valid JSON data.
- Set class & package names — Customize the output.
- Choose style — Lombok @Data or traditional getters/setters.
- Copy or download — Save as
.javafile.
Frequently Asked Questions
What Java versions are supported by the generated code?
The generated POJO classes use standard Java syntax compatible with Java 8 and above. With Lombok enabled, you need Lombok 1.18+ and Java 8+. Without Lombok, the code uses standard getter/setter conventions that work with any Java version.
Should I use Lombok or traditional getters and setters?
Lombok reduces boilerplate code significantly with annotations like @Data, @Getter, and @Setter. It is widely used in modern Java projects. Choose traditional getters/setters if you cannot use Lombok in your project or prefer explicit method definitions.
How are nested objects handled?
Nested JSON objects are generated as inner static classes within the main class. Each nested class follows the same pattern with private fields, getters, setters, and Lombok annotations based on your chosen options.
Can I customize the package name?
Yes. Enter a custom package name in the Package input field. The generated code includes the package declaration at the top of the file. If left empty, no package declaration is generated.
Does the tool support JSON arrays at the root level?
Yes. If your JSON is an array of objects at the root level, the tool generates the class definition based on the first object in the array. All fields across all array elements are considered for generating the complete class.
Last updated: 17 Aug 2026
Blog
Latest from Our Blog
How to Choose a Hash Algorithm for Data Security
A practical decision guide to choosing the right hash algorithm: MD5, SHA-1, SHA-2, SHA-3, bcrypt, argon2, PBKDF2, and SRI, with comparisons and clear recommendations.
Aug 08, 2026
CSS vs Tailwind CSS: Which One Should You Use?
A thorough, practical comparison of hand-written CSS and Tailwind CSS: learning curve, maintainability, performance, team workflows, and when each approach wins.
Aug 08, 2026
How to Optimize Core Web Vitals for Your Website
Learn practical, step-by-step techniques to improve LCP, INP, and CLS on your website. A developer-focused guide with real measurements and fixes.
Aug 08, 2026
How to Use Base64 Encoding in Real Projects
Learn practical, production-ready ways to use Base64 encoding: data URLs for images, JWT payloads, API tokens, and email attachments, with real code examples.
Aug 08, 2026
AES Encryption Explained: How It Works and Why It Matters
Learn how AES encryption works, the differences between AES-128, AES-192, and AES-256, and how to encrypt and decrypt data online.
Jun 23, 2026