JSON to POJO Online

What is a POJO?

POJO stands for Plain Old Java Object. It refers to a simple Java class that doesn't rely on any special restrictions, frameworks, or libraries. A POJO typically contains:

• Private variables to store data
• Public getter and setter methods to access or modify those variables
• No annotations or dependencies unless added manually

Think of a POJO as a clean and minimal way to represent structured data in Java. For example, if your JSON has keys like name, email, and age, the corresponding POJO will have private fields for each of these, along with getter and setter methods.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging information between systems. It is easy to read and write for both humans and machines.

JSON is commonly used in web development to send data between a server and a browser. It is also used in APIs, configuration files, and data serialization.

How to Use the JSON to POJO Converter?

• Enter your JSON: Paste or type your JSON data into the Input box labeled "Enter JSON here."
• Enable Auto Update: By default, Auto Update is checked. This means the output will refresh automatically whenever you change the input. You can uncheck it if you want to update manually.
• Click "JSON to POJO" (Optional): Press the black "JSON to POJO" button in the center to generate the corresponding Java POJO code.
• View the Output: The generated Java class will appear in the Output box below. You can scroll, copy, or edit the result as needed.
• Use Copy or Reset Icons: Use the icons on the right to
  • Copy input or output.
  • Clear the fields
  • Reset the tool

Use Cases of JSON to POJO Converter

• API Integration in Java Projects: When you're consuming APIs that return JSON responses, this tool helps you quickly generate POJO classes to map the JSON data into Java objects. This is especially useful in frameworks like Spring Boot or Retrofit.
• Model Class Generation for Web & Mobile Apps: Instead of manually writing model classes, developers can use this tool to automatically generate POJOs that represent the JSON structure used in frontend-backend communication.
• Faster Development & Prototyping: For projects with complex or large JSON structures, this tool speeds up development by saving time on manual class writing.
• Working with Libraries like Jackson or Gson: POJOs generated by this tool are ready to use with popular JSON parsing libraries such as Jackson, Gson, or Moshi for easy deserialization.
• Testing and Mocking Data: Developers or QA testers can create POJOs from test JSON samples to mock data and simulate responses during development or automated testing.
• Learning and Practice: This tool is a great way for Java beginners to understand how JSON maps to Java classes and how fields and data types are translated from JSON to POJO format.

Frequently Asked Questions (FAQs)

Do I need to download anything?

No. This tool runs fully online in your browser.

Can it handle large and nested JSON?

Yes. It supports deeply nested JSON objects and arrays.

Is the output customizable?

You can edit the generated code directly or paste it into your IDE for further changes.

Can I convert multiple JSON files at once?

This tool currently supports one JSON input at a time. For batch conversion, you would need to run them one by one or use a script in your development environment.

Is my data saved or stored anywhere?

No. This tool runs entirely in your browser. None of your JSON input or output is stored, logged, or transmitted to any server.