Top 7 Java Transpiler Projects

jsweet

5 1,406 0.0 Java

A Java to JavaScript transpiler.

Project mention: Ask HN: Anyone Interested in Taking over Jsweet.org? | news.ycombinator.com | 2023-12-10

You can take a look at https://github.com/j4ts, which contains some Java libs transpiled by JSweet to TS/JS. The AWT/Swing implementation is just a proof of concept, but some other libs are fully functional like awt/geom.
However, you have to be aware that the initial purpose of JSweet was not to port all Java libs to JS. JSweet allows the transpiler to be customized (with extensions) to map Java APIs to JS ones so that you don't necessarily need a JS runtime. It's all explained in the "Extending the transpiler" section of the core doc: https://github.com/cincheo/jsweet/blob/master/doc/jsweet-lan...
j2cl

3 1,122 0.0 Java

Java to Closure JavaScript transpiler

Project mention: CheerpJ 3.0: a JVM replacement in HTML5 and WASM to run Java on modern browsers | news.ycombinator.com | 2023-05-09
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Bytecoder

4 826 7.3 Java

Framework to interpret and transpile JVM bytecode to JavaScript, OpenCL or WebAssembly.

Project mention: CheerpJ 3.0: a JVM replacement in HTML5 and WASM to run Java on modern browsers | news.ycombinator.com | 2023-05-09
webfx

2 260 0.0 Java

A JavaFX application transpiler. Write your Web Application in JavaFX and WebFX will transpile it in pure JS.

Project mention: I like to discuss ui frameworks for java backend? | /r/java | 2023-06-25

There's this: https://github.com/webfx-project/webfx. But it uses GWT which is not maintained (actively) anymore.
bck2brwsr

1 112 0.0 Java

Bck2Brwsr VM to transpile Java bytecode to JavaScript

Project mention: is there a way to create a java library with JS/TS bindings that can be published to npmjs ? | /r/java | 2023-07-05
clearwing-vm

2 33 5.5 Java

A Java to C++ transpiler project

Project mention: Clearwing VM: A Java to C++ transpiler | /r/opensource | 2023-01-21
PyJava

0 24 0.0 Java

Use braces and semicolons in Python!
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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-12-10.