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JSON · Java

JSON → Java POJO

Generate Java entity classes from JSON · Lombok / Jackson annotations supported

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Generation Options
Input JSONJSON
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Generated resultJava
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Overview: The JSON → Java POJO generator produces Plain Old Java Objects from a sample JSON payload. It can add Lombok’s @Data annotation to eliminate boilerplate, and can automatically emit Jackson’s @JsonProperty annotation so snake_case and camelCase field names line up. It is an essential helper for Spring Boot or MyBatis projects that consume REST APIs.

How to use: Step 1 — paste a sample JSON payload on the left, or click "Sample" to load example data. Step 2 — fill in the target package name (for example com.example.model) and the root class name (defaults to RootObject). Step 3 — tick "Use Lombok @Data" to skip getters/setters, or tick "Add @JsonProperty annotation" so JSON field names map to Java fields correctly. Step 4 — the right editor shows the generated Java code instantly; copy it into your IDE or download it as a .java file. Nested objects are automatically split into separate entity classes.

Typical scenarios: Back-end developers integrating with WeChat, Alipay, DingTalk or other open-platform APIs turn documentation examples into ready-to-use DTOs. Spring Boot projects generate Request / Response classes based on agreed front-end payload shapes. QA engineers batch-generate deserialisation entities from API docs. Data-platform developers convert Kafka or MQ message structures into POJOs for consumption.

Technical notes: Strings map to String, integers to Integer, floats to Double, booleans to Boolean, arrays to List<T>, and null defaults to Object. Array elements are merged. Default indentation is 4 spaces but can be switched to 2. When Lombok is enabled, make sure your project has the lombok dependency and the IDE plugin configured. The Jackson annotation requires the com.fasterxml.jackson.annotation package.

Privacy: Generation happens entirely in your browser and no JSON data is ever uploaded, so it is safe to use with sample payloads that contain business fields or commercial secrets.

Frequently Asked Questions

How do I use JSON → Java POJO?
Step 2 — fill in the target package name (for example com.example.model ) and the root class name (defaults to RootObject ). Step 3 — tick "Use Lombok &#64;Data" to skip getters/setters, or tick "Add &#64;JsonProperty annotation" so JSON field names map to Java fields correctly.
What can JSON → Java POJO do?
Spring Boot projects generate Request / Response classes based on agreed front-end payload shapes. QA engineers batch-generate deserialisation entities from API docs.
Is my data private when I use JSON → Java POJO?
Privacy: Generation happens entirely in your browser and no JSON data is ever uploaded, so it is safe to use with sample payloads that contain business fields or commercial secrets. Privacy: Generation happens entirely in your browser and no JSON data is ever uploaded, so it is safe to use with sample payloads that…
What technical details should I know about JSON → Java POJO?
Array elements are merged. Default indentation is 4 spaces but can be switched to 2.