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JSON to Java POJO — Generate Java Classes From JSON Online

Generate a Java POJO from JSON. Toggles for Jackson annotations, Lombok, or Java 16+ records. Nested objects become nested classes.

Free No signup Client-side Privacy friendly Updated

How to use

  1. 1 Paste a JSON object or array (the first element is used for arrays).
  2. 2 Name the root class and optionally set a package.
  3. 3 Pick annotation style: Jackson, Lombok, or plain getters/setters. Toggle records for Java 16+ value types.
  4. 4 Copy or download the generated <code class="font-mono">.java</code> file.

Why use this tool

  • Generates a complete POJO (Plain Old Java Object) — fields, getters, setters, equals/hashCode where appropriate.
  • Hand-rolled type inference — integer vs long, double, boolean, String.
  • Nested objects become nested static classes; arrays become typed <code class="font-mono">List&lt;&gt;</code>.
  • Toggle annotations to match your team's style (Jackson + Lombok is a popular combo).
  • Pure client-side — your JSON stays in the browser, no upload.

Frequently asked questions

What is a POJO and how is it different from a Java class?

POJO stands for Plain Old Java Object — a regular Java class with fields plus getters/setters and no framework superclass, interface, or annotation requirement. Every POJO is a Java class; the term emphasises that it carries no Spring, EJB, or persistence baggage. The output of this converter is a POJO by that definition.

How are types inferred for numbers?

Integer values within 32-bit range become <code class="font-mono">Integer</code>; larger integers become <code class="font-mono">Long</code>; values with fractions become <code class="font-mono">Double</code>.

What if my array is empty?

Empty arrays fall back to <code class="font-mono">List&lt;Object&gt;</code>. Provide at least one sample element for a precise type.

Should I pick Jackson, Lombok, or records?

Jackson <code class="font-mono">@JsonProperty</code> is right when JSON field names differ from Java conventions or include reserved words. Lombok <code class="font-mono">@Data</code> hides boilerplate for mutable DTOs. Records (Java 16+) are best for immutable value objects — no setters, automatic <code class="font-mono">equals</code>/<code class="font-mono">hashCode</code>.

Records + Lombok together?

Records are already immutable value types — Lombok's <code class="font-mono">@Data</code> is redundant. When Records is on, Lombok is ignored.

Does this run on the server?

No. Generation runs entirely in your browser using JavaScript — your JSON is never sent to a Zerethon server.

Need another language?

JSON to TypeScript, Go, or C# converters are on the roadmap.

What is JSON to Java POJO?

A POJO (Plain Old Java Object) is a simple Java class with fields, getters, and setters and no framework-imposed restrictions. A JSON to POJO converter reads a JSON document, infers field types (Integer, Long, Double, Boolean, String, List), and emits a Java class with optional Jackson annotations, Lombok shortcuts, or Java 16+ record syntax — saving the boilerplate of mapping each property by hand.

Summary

JSON to Java POJO is a free desarrollo utility by Zerethon Tools. Generate a Java POJO from JSON. Toggles for Jackson annotations, Lombok, or Java 16+ records. Nested objects become nested classes. Runs entirely in the browser — no signup, no upload.

Category
Desarrollo
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. JSON to Java POJO runs entirely client-side — no server upload, no logging, no tracking of your input.

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