OpenAPI Validator
Check a local Swagger 2.0, OpenAPI 3.0 or OpenAPI 3.1 document for schema errors and broken internal references. Read the reported paths without querying your API.
Open toolJSON to Java class Generator
Generate plain Java model classes from a JSON object or object array. Download a ZIP with separate class files, then review inferred types and add your serializer mapping.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Generate Java.
Your result
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Result will appear here
How JSON to Java class Generator works
Use quicktype to infer nested sample types and render Java classes.
Processing uses bundled libraries in this browser. The download contains the generated source or document, rather than a link to a conversion service.
How to generate Java
Start with the supported input, then check the generated result.
Enter the source details
Use JSON sample, Root type name. The form starts with an example you can replace.
Input and settings
Tool result
Review and save the output
Review a ZIP of plain Java model class files inferred from JSON. Download the generated file and check it in the application where you plan to use it.
Review the details
When to use JSON to Java class Generator
These workflows use the formats and behavior supported by this implementation.
Sketch API model classes
Start a new Java model from a representative response object. Include examples of the nested fields your application actually receives.
Inspect nested object shapes
Nested objects and arrays produce inferred model types. One sample does not establish every allowed shape or optional field.
Review Java serializer requirements
Read the generated source for imports and serializer expectations. Compile it with your own Java version and dependencies.
What the output contains
Keep the output format and conversion policy in view.
A ZIP of plain Java model class files inferred from JSON. Use quicktype to infer nested sample types and render Java classes.
Compare the result with the original before replacing a source file. Conversion limits are listed below.
Supported input and limits
Check these conditions before relying on the result.
The ZIP keeps one public class per file in package io.quicktype. These are plain types; add your own serializer mapping. Source inference does not define a complete contract or compile the output. Check integer ranges, nullable fields and names in your own project.
Input and results are not stored after leaving or reloading. Keep the original and download any output you need.
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Generate the supported output, review it, and save a copy for your next step.
JSON to Java class Generator: common questions
Answers about using JSON to Java class Generator and understanding its results.
What does this tool produce?
It produces a ZIP of plain Java model class files inferred from JSON. The ZIP keeps one public class per file in package io.quicktype. These are plain types; add your own serializer mapping. Source inference does not define a complete contract or compile the output. Check integer ranges, nullable fields and names in your own project.
Is my input uploaded?
Processing runs in this browser with local bundled libraries. No input is sent to a conversion server. Download your result before leaving the page.