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Generate Java POJO classes with Jackson-friendly getters and setters from a JSON sample.
Input
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Output
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Status
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Time
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This conversion runs on our server to use a Node-only library. Your input is processed for the request and never stored.
JSON to Java is a free online converter on AltFTool that generates Java POJO classes with Jackson-friendly getters and setters from a JSON sample — no signup and nothing to install.
The conversion runs on AltFTool's server: your input is sent to the AltFTool API, converted, and returned to your browser. It is not stored. JSON to Java is powered by the quicktype-core library, and the Java result can be copied or downloaded as json-to-java.java.
The shape of the output is inferred from the JSON sample you paste, so the keys, types and nesting in your input decide the keys, types and nesting you get back.
| Input format | JSON |
|---|---|
| Output format | Java |
| Output file | json-to-java.java (text/plain) |
| Runs | On AltFTool's server — the input is sent to our API and not stored. |
| Library | quicktype-core |
| Category | JSON converters on AltFTool |
Open JSON to Java on AltFTool — the converter loads straight away, with no account.
Paste your JSON into the left-hand input pane, or press Sample to load a working example.
About 300ms after you stop typing, AltFTool posts your input to its conversion API and puts the Java output in the right-hand pane.
If this converter exposes options, open Settings to change them — the output re-runs as you adjust.
Copy the Java output with the Copy button, or download it as json-to-java.java.
Yes — this one runs on the server, because quicktype-core is a Node library rather than a browser one. Your JSON is sent to the AltFTool API, converted, and returned. It is not stored.
The quicktype-core library, running on AltFTool's server. The Java you see is that library's output rather than an approximation written here.
Yes. Server-side converters accept up to 200,000 characters of input per request; anything larger is rejected with a "too large" error instead of being truncated.
The result is Java. Copy it from the output pane in one click, or download it as json-to-java.java — AltFTool names the file after the converter and serves it as text/plain.
Yes. JSON to Java is free to use on AltFTool, with no account and no sign-up.
Drop the live JSON to Java workspace into your own docs page, tutorial or blog post with one snippet. Free, responsive, light and dark — just keep the “Widget by AltFTool” credit link visible.
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