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JSON Toolbox- Free online JSON tools

JSON to Java

Convert JSON to Java POJO classes online. Types are inferred for nested objects and arrays — and everything runs in your browser.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded
Input JSON

Empty

Java output

Empty

How it works

About this tool

This free online JSON to Java generator turns a sample JSON payload into Java POJO classes. Paste a representative response, set a root type name, and the tool infers a type for every field — including nested objects and array elements.

Each class gets private fields with boxed types (Long, Double, Boolean, String), plus getters and setters. Collections use java.util.List so nested arrays map cleanly to typed lists.

Useful for Jackson / Gson DTOs when you already have a sample JSON body and want boilerplate POJOs without writing every getter by hand.

Generation runs entirely in your browser. Your JSON is never uploaded or stored, so it is safe to use with production API responses and payloads that contain sensitive data.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I convert JSON to Java?
Paste your JSON into the input editor and the generated Java code appears on the right. Set a root type name to control what the top-level type is called, then copy or download the result.
Does it handle nested objects and arrays?
Yes. Nested objects become their own named types, and arrays are typed by their element. When objects in an array have slightly different shapes, their fields are merged and any field missing from some items is marked optional.
What should I know about the generated Java code?
Numbers are mapped to boxed numeric types based on the sample; very large integers may need a Long or BigDecimal review. The generator does not add Jackson annotations — add @JsonProperty or naming strategies in your project if required.
Is my JSON uploaded anywhere?
No. The Java code is generated locally in your browser. Nothing is sent to a server, logged, or stored — even for large or sensitive payloads.

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