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{}JSONKits

JSON to POJO

Generate Plain Old Java Object (POJO) classes with Jackson annotations from JSON data samples.

Input

json
loading editor…

Paste your JSON here...
or drop a file anywhere in this pane

Output

java

Generated POJO will appear here...
press ⌘↵ to generate pojo

What Is a POJO?

POJO stands for Plain Old Java Object — a simple Java class with private fields, public getters and setters, and a default constructor. In modern Java development, POJOs are used throughout applications to represent data models, from database entities to API request and response objects.

POJOs are commonly used for:

  • API Models: Representing JSON request/response bodies in Spring Boot applications.
  • Data Transfer Objects: Passing data between different layers of an application.
  • Database Entities: Mapping to database tables via JPA or Hibernate.
  • Configuration: Binding application properties to typed objects.

What Are Jackson Annotations?

Jackson is the most popular JSON processing library for Java. It uses annotations like @JsonProperty, @JsonIgnore, and @JsonFormat to control how Java objects are serialized to JSON and deserialized from JSON. This tool generates POJOs with Jackson annotations pre-configured based on your sample data.

When to Use JSON to POJO Conversion

Converting JSON to POJOs is a standard step when integrating with REST APIs in Java. Instead of manually writing getters and setters for dozens of fields, you can generate the entire class from a sample JSON response, saving time and reducing typo-related bugs.

How to Generate POJO from JSON Online

  1. Paste your JSON sample: Copy a representative JSON object from your API documentation or response.
  2. Click Generate POJO: Press the button to create a Java class with Jackson annotations based on your data.
  3. Review the Output: Check that field names, types, and nested class structures match your requirements.
  4. Copy to Your Project: Use the Copy button to add the generated class directly into your Java source code.

Frequently Asked Questions

Does the tool support nested objects?

Yes, the tool generates inner static classes for nested objects and properly maps arrays to List or Set types based on the JSON structure.

Is this tool safe to use?

Absolutely. All processing happens entirely in your browser. Your JSON data is never sent to any server — it stays on your device.

Can I use this for Kotlin or other JVM languages?

While the generated code is Java, you can adapt it for Kotlin or other JVM languages. We also offer a dedicated Kotlin data class generator in our tools collection.

Real-World Examples

Java developers frequently use JSON to POJO generators when integrating with third-party APIs in Spring Boot projects. Instead of manually creating model classes with Jackson annotations, a single paste generates all the boilerplate code, including nested class structures for complex API responses.

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