Free online JSON to Java class generator. Paste JSON and generate Java POJO classes or records with getters/setters, @Nullable annotations, and nested type support automatically. 100% browser-based with zero uploads.
100% browser-based — your data never leaves your device
Convert JSON to Java POJO classes instantly. Generate Java records or classes with getters and fields from JSON samples.
Copy your JSON data and paste it into the input textarea above.
Toggle record mode, nullable detection, and package naming preferences.
Click Generate, then copy the Java classes or download the .java file.
Drop a file here or click to browse
Ctrl+Enter to generate
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JSON to Java is a free online json tool that convert json to java pojo classes instantly. generate java records or classes with getters and fields from json samples. It works entirely in your browser — no downloads, no installations, and no server uploads required. backend developers, frontend engineers, DevOps engineers use JSON to Java when they need a fast, privacy-respecting way to process json data without installing additional software. It supports capabilities such as pojo or record mode, type mapping, nullable support. Additional features include local processing. Common use cases include generating java pojos from api response json for rest client libraries, creating data transfer objects (dtos) from sample data contracts, rapid prototyping of java class hierarchies from json schemas. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes JSON to Java ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
JSON to Java Class Generator is a free online json tool that helps you convert json to java pojo classes instantly. generate java records or classes with getters and fields from json samples. Key capabilities include pojo or record mode, type mapping, nullable support. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to generating java pojos from api response json for rest client libraries.
Copy your JSON data and paste it into the input textarea above.
Toggle record mode, nullable detection, and package naming preferences.
Click Generate, then copy the Java classes or download the .java file.
| Category | Details |
|---|---|
| Input Limits | Maximum file size: Browser memory bound (~2 GB) |
| Nesting depth: Unlimited (browser stack limit) | |
| Supported Formats | JSON, JSONC (with comments), JSON5 (extended syntax) |
| Browser Engine |
|
All operations run entirely in your browser using built-in JSON APIs. No server uploads, no data storage, and no third-party requests.
JSON to Java is ideal when you need to generating java pojos from api response json for rest client libraries without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for persistent editing environments with linting, consider using VS Code with JSON extension. For for server-side JSON processing in scripts, jq (command-line) may be a better fit. JSON to Java fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
POJO mode targets Java 8+ with standard getter/setter patterns. Record mode targets Java 16+ with the compact record syntax.
Nested objects become separate static inner classes within the main class, with proper type references between them.
No. All conversion happens locally in your browser.
Generate traditional POJO classes with private fields and getters, or modern Java 16+ records.
Automatically maps JSON types to Java types: String, Integer, Double, Boolean, List, Map, and nested class references.
Fields with null values use @Nullable annotation or Optional<T> wrapper types.
All conversion happens in your browser — your data stays private.
JSON to Java Class Generator is useful in a variety of scenarios across different workflows:
Generating Java POJOs from API response JSON for REST client libraries
Creating data transfer objects (DTOs) from sample data contracts
Rapid prototyping of Java class hierarchies from JSON schemas
Java records are ideal for data carrier objects. Enable record mode when you only need immutable data with constructor, equals, hashCode, and toString.
Enable nullable detection and @Nullable annotations to document which fields may be null, improving code safety and IDE support.
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