Awesome Transpilers

By Target Language

Golang

• c2go A tool for transpiling C to Go.
• Grumpy Grumpy is a Python to Go source code transcompiler and runtime.

Java

• VOC A transpiler that converts Python code into Java bytecode.

JavaScript

• Shift.JS Swift to JavaScript transpiler.
• ElixirScript Converts Elixir to JavaScript.
• GopherJS A compiler from Go to JavaScript for running Go code in a browser.
• Dart2js Use the dart2js tool to compile Dart code to deployable JavaScript.

Transpilers

TypeScript Compiler

• https://github.com/microsoft/TypeScript - 90K stars
• https://www.typescriptlang.org/
• https://github.com/kidonng/typescript - A tiny redistribution of TypeScript (10x smaller, 4MB versus 40MB)
• criticism: https://gist.github.com/amcdnl/b52e9dd11850eeb8de8f#file-hate-typescript-md
• alternative: JavaScript with jsdoc type annotations
  • https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html
  • https://github.com/futurGH/ts-to-jsdoc
• written in: TypeScript
• compiles from: TypeScript
• compiles to: JavaScript
• last commit: 2023

Babel

• https://github.com/babel/babel - 40K stars
• compile new versions of JavaScript (ES2020) to old versions of JavaScript (ES2015)
• written in: TypeScript, JavaScript
• compiles from: JavaScript
• compiles to: JavaScript
• last commit: 2023

eslint

• https://github.com/eslint/eslint - 24K stars
• live demo: https://eslint.org/play/
• website: https://eslint.org/
• javascript codemods
• written in: JavaScript
• compiles from: JavaScript
• compiles to: JavaScript

Nim

• https://github.com/nim-lang/Nim - 15K stars
• https://nim-lang.org/
• written in: Nim (self-hosted)
• compiles from: Nim
• compiles to: C, C++, JavaScript

ClojureScript

• https://github.com/clojure/clojurescript - 9K stars
• https://clojurescript.org/
• written in: Clojure
• compiles from: Clojure
• compiles to: JavaScript

jscodeshift

• https://github.com/facebook/jscodeshift - 8K stars
• toolkit for running codemods over multiple JavaScript or TypeScript files
• codemods = refactoring
• written in: JavaScript
• compiles from: JavaScript
• compiles to: JavaScript
• last commit: 2023

ast-grep

• https://github.com/ast-grep/ast-grep - 5K stars
• CLI tool for code structural search, lint and rewriting
• "grep for code"
• "grep for AST nodes"
• based on tree-sitter parsers
• written in: Rust
• compiles from: all languages
• compiles to: all languages

c2rust

• https://github.com/immunant/c2rust - 3K stars
• Migrate C code to Rust
• written in: Rust
• compiles from: C, C++
• compiles to: Rust

andrei-markeev/ts2c

• https://github.com/andrei-markeev/ts2c - 1K stars
• live demo
• written in: C
• compiles from: TypeScript, JavaScript
• compiles to: C
• last commit: 2022

OneLang

• https://github.com/onelang/OneLang - 1K stars
• written in: TypeScript
• compiles from: TypeScript, C#, Ruby
• compiles to: C++, C#, Go, Java, JS, Perl, PHP, Python, Ruby, Swift, TypeScript
• last commit: 2021

cheerp

• https://leaningtech.com/cheerp/
• https://leaningtech.com/cheerp-2-6-compiling-c-to-webassembly-and-javascript/
• https://github.com/leaningtech/cheerp-meta - 800 stars
• https://github.com/leaningtech/cheerp-compiler - 200 stars
• license: open source, with dual licence (GPLv2 & commercial), some plugins are closed source (WebAssembly memory profiler, Filesystem emulation)
• based on: LLVM
• written in: C++
• compiles from: C, C++, Java, x86, Adobe Flash
• compiles to: WASM

Haxe

• https://github.com/HaxeFoundation/haxe - 5K stars
• written in: OCaml
• compiles from: Haxe
• compiles to: AS2, AS3, C++, C#, Java, JS, Lua, Neko, PHP, Python

QQuick/Transcrypt

• https://github.com/QQuick/Transcrypt - 3K stars
• written in: Python
• compiles from: Python
• compiles to: JavaScript
• last commit: 2022

winemaker

• https://gitlab.winehq.org/wine/wine/-/blob/master/tools/winemaker/winemaker
  • github mirror: https://github.com/wine-mirror/wine/blob/master/tools/winemaker/winemaker
• https://wiki.winehq.org/Winemaker
• part of wine: https://gitlab.winehq.org/wine/wine
  • github mirror: https://github.com/wine-mirror/wine - 3K stars
• https://wiki.winehq.org/Winemaker
• convert Windows sources to Winelib programs
• written in: Perl
• languages: C, C++
• compiles from: Windows
• compiles to: Linux, BSD, MacOS, ...

Js2Py

• https://github.com/PiotrDabkowski/Js2Py - 2K stars
• https://pypi.org/project/Js2Py/
• written in: Python
• compiles from: JavaScript (ECMAScript 5.1)
• compiles to: Python
• last commit: 2022
• functions: js2py.translate_js, js2py.translate_file

Fennel

• https://github.com/bakpakin/Fennel - 2K stars
• https://fennel-lang.org/
• docs:
  • https://technomancy.us/192 - self-hosting, bootstrapping
    • via: https://www.reddit.com/r/Clojure/comments/qwchlm/comment/hl4raup/
• written in: Lua, Fennel (Lisp)
• compiles from: Fennel (Lisp)
• compiles to: Lua
• last commit: 2023

Cito

• https://github.com/pfusik/cito - 1.5K stars
• one to many
• written in: C#
• compiles from: Cito
• compiles to: C, C++, C#, Java, JavaScript, Python, Swift, TypeScript, OpenCL C

TypeScriptToLua

• https://github.com/TypeScriptToLua/TypeScriptToLua - 1.5K stars
• written in: TypeScript
• compiles from: TypeScript
• compiles to: Lua

jingweno/godzilla

• https://github.com/jingweno/godzilla - 1.5K stars
• written in: Go
• compiles from: JavaScript
• compiles to: Go
• last commit: 2017

cincheo/jsweet

• https://github.com/cincheo/jsweet - 1.3K stars
• A Java to JavaScript transpiler
• written in: Java
• compiles from: Java
• compiles to: JavaScript
• last commit: 2022

google/j2cl

• https://github.com/google/j2cl - 1K stars
• written in: Java
• compiles from: Java
• compiles to: JavaScript, Closure JavaScript
• last commit: 2022

Pebaz/nimporter

• https://github.com/Pebaz/nimporter - 700 stars
• written in: Python
• compiles from: Nim
• compiles to: Python
• last commit: 2022

pseudo-lang

• https://github.com/pseudo-lang/pseudo - 700 stars
• one to many
• generate readable code
• help with automated translation for cases like algorithm generation, parser generation, refactoring, porting codebases
• written in: Python
• compiles from: Pseudo
• compiles to: Python, JavaScript, Go, C#, C++, Ruby
• last commit: 2021

LingDong-/wax

• https://github.com/LingDong-/wax - 600 stars
• A tiny programming language
• written in: C
• compiles from: Wax
• compiles to: C, C++, Java, TypeScript, Python, C#, Swift, Lua, WebAssembly
• last commit: 2022

TypeScript2Cxx

• https://github.com/ASDAlexander77/TypeScript2Cxx - 500 stars
• https://news.ycombinator.com/item?id=22746170
• compiles from: TypeScript
• compiles to: C++
• last commit: 2021

putout

• https://github.com/coderaiser/putout - 500 stars
• live demo: https://putout.cloudcmd.io/
• codemods = refactoring
• written in: JavaScript
• compiles from: JavaScript
• compiles to: JavaScript
• last commit: 2023

webcrack

• https://github.com/j4k0xb/webcrack - 400 stars
• live demo: https://webcrack.netlify.app/
• deobfuscator, decompiler, reverse engineering
• with ESM support: import, export, ...
• compiles from: JavaScript
• compiles to: JavaScript
• last commit: 2024

wakaru

• https://github.com/pionxzh/wakaru - 100 stars
• live demo: https://wakaru.vercel.app/
• deobfuscator, decompiler, reverse engineering
• with ESM support: import, export, ...
• compiles from: JavaScript
• compiles to: JavaScript
• last commit: 2024

jsxx

• https://github.com/surma/jsxx - 150 stars
• compiles from: JavaScript
• compiles to: C++
• last commit: 2022

ben-sb/obfuscator-io-deobfuscator

• https://github.com/ben-sb/obfuscator-io-deobfuscator - 150 stars
• deobfuscator for scripts obfuscated by obfuscator.io
• live demo: https://obf-io.deobfuscate.io/
• deobfuscator, decompiler, reverse engineering
• with ESM support: import, export, ...
• written in: TypeScript
• compiles from: JavaScript
• compiles to: JavaScript
• last commit: 2024

StaticScript

• https://github.com/ovr/StaticScript - 600 stars
• compiles from: TypeScript
• compiles to: LLVMIR (more compiler than transpiler)
• last commit: 2020

ts-llvm

• https://github.com/emlai/ts-llvm - 300 stars
• compiles from: TypeScript
• compiles to: LLVMIR (more compiler than transpiler)
• last commit: 2019

muta-minits

• https://github.com/nervosnetwork/muta-minits - 150 stars
• compiles from: TypeScript
• compiles to: LLVMIR (more compiler than transpiler)
• last commit: 2019

transpyle

• https://github.com/mbdevpl/transpyle - 100 stars
• https://pypi.org/project/transpyle/
• written in: Python
• compiles:
  • C to Python AST
  • Python AST to C
  • C++ to Python AST
  • Python AST to C++
  • Cython to Python AST
  • Python AST to Cython
  • Fortran to Python AST
  • Python AST to Fortran
  • OpenCL to Python AST
  • Python AST to OpenCL
  • Python to Python AST
  • Python AST to Python

speedy.js

• https://github.com/MichaReiser/speedy.js - 350 stars
• compiles from: JavaScript
• compiles to: WebAssembly (more compiler than transpiler)
• last commit: 2017

futurGH/ts-to-jsdoc

• https://github.com/futurGH/ts-to-jsdoc - 60 stars
• compiles from: TypeScript
• compiles to: JavaScript (with JSDoc type annotations)
• last commit: 2023

ccxt/crosspile

• https://github.com/ccxt/crosspile - 60 stars
• A cross-compiler from JavaScript to any language (currently, Python and PHP) // WORK IN PROGRESS (early stages)
• written in: JavaScript
• compiles from: JavaScript
• compiles to: PHP, Python
• last commit: 2017

bash2py

• https://github.com/clarity20/bash2py - 30 stars
• https://www.swag.uwaterloo.ca/bash2py/
• Bash to Python script translator, implemented by modifying the bash C code, so that instead of executing bash commands, the modified tool simply emits (to the extent currently possible) the commands seen as equivalent Python statements.
• written in: C
• compiles from: Bash
• compiles to: Python
• last commit: 2023

ccxt/ast-transpiler

• https://github.com/ccxt/ast-transpiler - 20 stars
• AST Transpiler that converts Typescript into different languages (PHP, Python, C# (wip))
• written in: TypeScript
• compiles from: TypeScript
• compiles to: PHP, Python
• last commit: 2024

sebbekarlsson/typescript

• https://github.com/sebbekarlsson/typescript - 15 stars
• compiles from: TypeScript
• compiles to: C
• last commit: 2019

sebbekarlsson/tscc

• https://github.com/sebbekarlsson/tscc - 15 stars
• compiles from: TypeScript
• compiles to: C
• last commit: 2019

andrejusk/typescript-compiler

• https://github.com/andrejusk/typescript-compiler - 15 stars
• compiles from: TypeScript
• compiles to: C
• last commit: 2018

yakir22/ts2cpp

• https://github.com/yakir22/ts2cpp - 10 stars
• compiles from: TypeScript
• compiles to: C++
• last commit: 2018

duncanhorn/ts2cpp

• https://github.com/duncanhorn/ts2cpp - 5 stars
• compiles from: TypeScript interface definitions (*.d.ts)
• compiles to: C++
• last commit: 2019

quadramadery/js2py

• https://github.com/quadramadery/js2py - 10 stars
• written in: JavaScript
• based on: espree-parser
• compiles from: JavaScript
• compiles to: Python
• last commit: 2019
• status: early draft

tython

• https://github.com/NCPlayz/tython - 5 stars
• written in: Python
• based on: lark-parser
• compiles from: TypeScript
• compiles to: Python
• last commit: 2020
• status: early draft

7HR4IZ3/es62py

• https://github.com/7HR4IZ3/es62py - 0 stars
• written in: Python
• based on: esprima-parser, js2py library
• compiles from: JavaScript (ECMA 6)
• compiles to: Python
• last commit: 2023
• status: early draft

prometeo

• https://github.com/zanellia/prometeo - 500 stars
• written in: Python
• compiles from: Python
• compiles to: C
• last commit: 2022

py2many

• https://github.com/py2many/py2many - 500 stars
• based on: https://github.com/konchunas/pyrs - 400 stars, Python to Rust transpiler
• one to many
• written in: Python
• compiles from: Python
• compiles to: Rust, C++, (Julia, Kotlin, Nim, Dart, Go)
• last commit: 2022

pyo3

• https://github.com/PyO3/pyo3 - 7K stars
• Rust bindings for the Python interpreter
• no transpiler
• use cases: write native Python modules in Rust, embed Python in a Rust binary

ts2nim

• https://github.com/bung87/ts2nim - 50 stars
• written in: TypeScript
• compiles from: TypeScript
• compiles to: Nim
• last commit: 2021

clojurec

• https://github.com/schani/clojurec - 1K stars
• based on: ClojureScript 0e0aa7f
• written in: Clojure
• compiles from: Clojure
• compiles to: C
• last commit: 2018

hissp

• https://github.com/gilch/hissp - 300 stars
• https://www.reddit.com/r/Clojure/comments/toyzq2/comment/i280x1f/
• written in: Python
• compiles from: Lisp
• compiles to: Python
• last commit: 2023

kalai

• https://github.com/kalai-transpiler/kalai - 200 stars
• via: https://elangocheran.com/2020/03/18/why-clojure-lisp-is-good-for-writing-transpilers/
  • via: https://www.reddit.com/r/Clojure/comments/qwchlm/why_clojure_lisp_is_good_for_writing_transpilers/
• written in: Clojure
• compiles from: Clojure
• compiles to: Rust, C++, Java, ...
• last commit: 2023

Cerberus X Trans

• https://www.cerberus-x.com/cxDocs/Tools_Trans.html
• https://github.com/cerberusxdev/cerberus - 200 stars
• https://github.com/cerberusxdev/cerberus/tree/develop/src/transcc/builders
• game development language with multiple target platforms (desktop, mobile, web)
• written in: C, Cerberus X
• compiles from: Cerberus X
• compiles to: C++, Objective-C, C#, Java, HTML
• last commit: 2023

roman01la/javascript-to-clojurescript

• https://github.com/roman01la/javascript-to-clojurescript - 100 stars
• written in: JavaScript
• compiles from: JavaScript
• compiles to: ClojureScript, Clojure
• last commit: 2023

basilisp

• https://github.com/basilisp-lang/basilisp - 50 stars
• https://www.reddit.com/r/Clojure/comments/toyzq2/comment/i281k15/
• written in: Python, Clojure
• compiles from: Clojure, Lisp
• compiles to: Python
• last commit: 2022

Kotlift

• https://github.com/studoverse/Kotlift - 400 stars, archived
• deprecated in favor of Kotlin Multiplatform Mobile
• written in: Kotlin, Swift
• compiles from: Kotlin
• compiles to: Swift
• last commit: 2023

andreikop/cpp2python

• https://github.com/andreikop/cpp2python - 150 stars
• written in: Python
• compiles from: C++
• compiles to: Python
• last commit: 2019

seasnake

• https://github.com/pybee/seasnake - 150 stars - archived
• written in: Python
• compiles from: C++
• compiles to: Python
• last commit: 2016

Progsbase

TODO what exactly is this? a transpiler service?

• https://www.progsbase.com/
• "Job Payments: You can create programming jobs using the progsbase client. Create payments here to reward developers who implement a solution to your job."
• closed source
• Free Community Plan: convert TypeScript, Java, C, C++, JavaScript, C#, PHP, Python, Visual Basic, Swift, LibreOffice Basic, Ruby, Visual Basic
• written in: Java, Progsbase
• compiles from: Java
• compiles to: Java, C, C++, JavaScript, C#, R, PHP, Python, Visual Basic
• since: 2018

jtransc

• https://github.com/jtransc/jtransc - 500 stars - archived
• written in: Java
• compiles from: Java, Kotlin
• compiles to: JavaScript, C++, D, C#, PHP, AS3, Dart, Haxe

specs-feup/clava

• https://github.com/specs-feup/clava - 50 stars
• applies analysis and transformations written in LARA scripts (which is based on JavaScript)
• based on: Clang
• written in: Java
• languages: C, C++, CUDA, OpenCL
• last commit: 2022

RapidFingers/Craxe

• https://github.com/RapidFingers/Craxe - 40 stars
• written in: Haxe
• compiles from: Haxe
• compiles to: Nim
• last commit: 2019

Ranger

https://github.com/terotests/Ranger - 5 stars

• written in: JavaScript
• self hosting
• compiles from: Ranger?
• compiles to: JavaScript, Java, Go, Swift, PHP, C++, C#, Scala
• last commit: 2018

cxx2cs

https://sourceforge.net/projects/cxx2cs/

• compiles from: C++
• compiles to: C#
• last commit: 2015

J2CL

https://github.com/google/j2cl - 1K stars

• Java to Closure JavaScript transpiler
• optimizes with Closure Compiler https://github.com/google/closure-compiler
• compiles from: Java
• compiles to: JavaScript
• last commit: 2022
• successor of: GWT

GWT

• https://github.com/gwtproject/gwt - 1.5K stars
• aka: Google Web Toolkit
• written in: Java
• compiles from: Java
• compiles to: JavaScript
• last commit: 2022

SequalsK

• paper: SequalsK—A Bidirectional Swift-Kotlin-Transpiler (2021)
  • https://dijkstra.iem.thm.de/Schultes-SequalsK-Preprint.pdf
  • https://ieeexplore.ieee.org/document/9460946 (paywall)
• paper: Evaluating swift-to-kotlin and kotlin-to-swift transpilers (2022)
  • https://dl.acm.org/doi/10.1145/3524613.3527811 (paywall)
• live demo: https://transpile.iem.thm.de/ (broken)
• talk: https://www.youtube.com/watch?v=eHUCWAf9aHI
• closed source
• bidirectional transpiler
• languages: Swift, Kotlin

python scripts to python modules

• status: concept, project idea
• written in: Python
• compiles from: Python scripts
• compiles to: Python modules
• simlar to: 2to3 in Python 3.11
• Python Setuptools: quick way to add scripts without "main" function as "console_scripts" entry points
• Convert python script in module
• chromium-depot-tools.nix

lezer-parser-import-tree-sitter-scanner

• https://github.com/milahu/lezer-parser-import-tree-sitter-scanner
• Helps import tree-sitter grammars and scanners.
• A grammar transpiler, and a domain-specific C++ to JavaScript transpiler.
• Import ANTLR grammars to lezer-parser
• written in: JavaScript
• compiles from: C++, tree-sitter grammars, ANTLR grammars
• compiles to: JavaScript, lezer-parser grammars

Transpiler Frameworks

can be used for all languages

• program transformation systems https://en.wikipedia.org/wiki/List_of_program_transformation_systems

comby

• https://github.com/comby-tools/comby - 2K stars
• A code rewrite tool for structural search and replace that supports about every language
• written in: OCaml
• languages: C, Java, Go, Swift, Rust, PHP, TypeScript, JavaScript, ...
• features: refactoring

JetBrains MPS

• https://github.com/JetBrains/MPS - 1.5K stars
• https://www.jetbrains.com/mps/
• metaprogramming language, Metaprogramming System
• Create your own domain-specific language
• written in: Java
• license: APL2

rose compiler

• https://github.com/rose-compiler/rose - 500 stars
• languages: C (C89 and C98), C++ (C++98 and C++11), UPC, Fortran (77/95/2003), OpenMP, Java, Python, PHP
• use cases: static analysis, program optimization, program transformation

jarble/transpiler

• https://github.com/jarble/transpiler - 400 stars
• translates a small subset of several programming languages into several others
• translate several metasyntax notations, such as EBNF and ABNF
• experimental "proof-of-concept," so it can only translate relatively simple programs
• A major goal of this project is to translate TypeScript and JavaScript to other languages that compile to C or native code. For example, it's possible to translate a subset of TypeScript to Zig
• written in: JavaScript
• languages: JavaScript, Prolog, C, C#, PHP, Python, Lua, Perl, Haskell, Fortran, Java, OCaml, GLSL, ...

Rascal

• https://github.com/usethesource/rascal - 300 stars
• https://www.rascal-mpl.org/docs/WhyRascal/UseCases/SourceToSource
• metaprogramming language
• written in: Java
• compiles from: any
• compiles to: any

true-grue/raddsl

• https://github.com/true-grue/raddsl - 100 stars
• Tools for rapid prototyping of DSL compilers
• features: parse, transform
• written in: Python
• last commit: 2021

LangTrans

• https://github.com/LangTrans/LangTrans - 20 stars
• Customize programming languages
• written in: Python
• features: parse, transform
• syntactic preprocessor
• customize the syntax of any programming language
• based on: regex
• last commit: 2022

codeworker

• http://codeworker.free.fr/
• CodeWorker can be trained to parse almost any language
• last version: 2010

SemanticDesigns DMS Toolkit

• https://www.semanticdesigns.com/Products/DMS/DMSToolkit.html
• Software Reengineering Toolkit
• closed source
• languages: C++, Java, COBOL, SQL, HTML, Verilog, ...
• written in: PARLANSE = parallel language. As an example, the attribute evaluation process is automatically parallelized, and can often provide a linear speedup on an N-way SMP system.

Code generators

• https://github.com/topics/code-generator
• https://github.com/yellicode/core - build your own code generation templates with TypeScript
  • https://github.com/yellicode/typescript-extension
  • Model driven: Generate code from any JSON document, or create your code models using our free, cross-platform modeling tool, Yellicode Modeler. Extend models with language- or framework specific meta data and use Yellicode's type-safe APIs to transform your models into code.

Partial evaluators

aka: partial evaluation, code optimizers, code optimization, dead code elimination, tree shaking, code compression, code minification

JavaScript

• https://github.com/terser/terser - 8K stars - JavaScript parser, mangler and compressor toolkit for ES6+
• https://github.com/google/closure-compiler - 7K stars - JavaScript checker and optimizer. written in Java
  • https://github.com/google/closure-compiler-npm/tree/master/packages/google-closure-compiler-js - javascript version of the google closure-compiler. deprecated. last commit 2020
• https://github.com/facebookarchive/prepack - 15K stars - last commit 2021. archived. outdated. does not work with javscript ESM modules
• https://github.com/mindedsecurity/JStillery - 1K stars - last commit 2019 - JavaScript Deobfuscation via Partial Evaluation
• https://github.com/SumeyyeSuslu/SPEjs - 5 stars - last commit 2018 - Symbolic Partial Evaluator for JavaScript. Sümeyye Süslü, Christoph Csallner, 2018
  • based on Z3 SMT solver
  • paper https://ranger.uta.edu/~csallner/papers/S%C3%BCsl%C3%BC18SPEjs.pdf

SVG

• https://github.com/svg/svgo - 20K stars - tool for optimizing SVG files. written in JavaScript

CSS

• https://github.com/linkedin/opticss - 1K stars - A CSS Optimizer

Machine Learning

• https://www.altamira.ai/open-source-gpt-alternative-solutions/
• https://www.ankursnewsletter.com/p/openais-gpt-3-vs-open-source-alternatives
  • GPT-J and GPT-Neo are the most popular open source alternatives to GPT-3 today
• GPT = Generative Pretrained Transformer
• LLM = large language model
• The Pile = 800 GB of English texts - https://pile.eleuther.ai/
• The Stack = 6TB of source code, covering 358 programming languages
  • https://huggingface.co/datasets/bigcode/the-stack
  • rust: https://huggingface.co/mrm8488/bloom-560m-finetuned-the-stack-rust
• HumanEval benchmark: https://github.com/openai/human-eval

ChatGPT by OpenAI

• https://chat.openai.com/
• works online
• requires login
• limitation: can translate up to 31523 characters of code = about 30 KByte, so large inputs must be splitted into smaller chunks
• start the chat with: can you translate from some_input_language to some_output_language?
  • can you translate from javascript to python?
  • can you translate from python to javascript?
  • ...
• chatGPT will also transform symbol names, for example from camelCase in javascript to snake_case in python. this is hard to disable. you can ask "can you translate ... and preserve the original symbol names?" but then the output is truncated after 3K characters
• on large inputs, chatGPT will return an interpretation of what the code is doing
  • answer: yes. can you translate the code to some_output_language?
    • yes. can you translate the code to python?
    • yes. can you translate the code to javascript?
    • ...
  • the output will pause, then click: continue generating
• languages: many
• based on Codex
  • what language model is used by chatgpt to translate between programming languages?
    • As of my last update in January 2022, ChatGPT does not directly translate between programming languages. However, OpenAI has developed models capable of code generation and understanding code in various programming languages, such as Codex, which powers GitHub Copilot. These models are trained on large datasets of code and natural language to understand and generate code snippets based on human-written descriptions or code prompts. While ChatGPT itself may not directly perform programming language translation, it can be used in conjunction with such code generation models to facilitate communication or provide assistance in programming-related tasks.

code converter by codingfleet

• https://codingfleet.com/code-converter/python/
• works online
• requires login for 5000 characters, otherwise only 1000 characters
• https://codingfleet.com/pricing/
  • free account: 5K characters per request, 10 requests per month
  • pro account: 32K characters per request
    • 5 usd / month = 50 requests per month
    • 10 usd / month = 200 requests per month
    • 24 usd / month = 1000 requests per month
  • unlimited account: 200 usd / year: 64K characters per request
• Languages: ABAP, APL, Ada, Assembly, Bash, C, C#, C++, COBOL, Clojure, CommonLisp, Crystal, Dart, Elixir, Elm, Erlang, F#, Fortran, Go, Groovy, Haskell, Java, Javascript, Julia, Kotlin, Lua, MATLAB, Nim, Node.js, OCaml, Objective-C, PHP, Pascal, Perl, PowerShell, Prolog, R, Ruby, Rust, SAS, SQL, Scala, Scheme, Swift, TypeScript, VHDL, Verilog, Zsh
  • Databases: BigQuery, IBM, Db2, MySQL, PL/SQL, PostgreSQL, Redshift, SQLite, Snowflake, T-SQL
  • Web Scraping: BeautifulSoup, Mechanize, Playwright, Puppeteer, Scrapy, Selenium
  • Web Programming: ASP.NET, Angular, CherryPy, Django, Express.js, FastAPI, Flask, Laravel, Pyramid, Rails, React, Spring, Symfony, VueJS
  • Deep Learning: Caffe, JAX, Keras, MXNet, PyTorch, TensorFlow, Theano

TransCoder by Facebook

• https://github.com/facebookresearch/TransCoder - 1.5K stars
  • deprecated in favor of CodeGen
• https://github.com/facebookresearch/CodeGen - 500 stars
• based on: tree-sitter parsers
• tags: ai, machine learning, generic, metaprogramming language, Metaprogramming System, transpiler framework
• Create your own domain-specific language
• generic transpiler, can be trained to translate all languages
• written in: Python
• license: MIT, Creative Commons Attribution-NonCommercial 4.0, Creative Commons Attribution-ShareAlike 2.0
• languages: C++, Java, Python, ... any

OPT by Facebook

• https://github.com/facebookresearch/metaseq/tree/main/projects/OPT
• blog post: https://ai.facebook.com/blog/democratizing-access-to-large-scale-language-models-with-opt-175b/
• license: open source (models, inference code, training code)
• parameters: 175B

InCoder by Facebook

• https://huggingface.co/facebook/incoder-6B
• parameters: 6B

CodeGen by Salesforce

• https://blog.salesforceairesearch.com/codegen/
• parameters: 16B
• trained on: The Pile, BigQuery (C, C++, Go, Java, JavaScript, Python)
• architecture: autoregressive language models for program synthesis

CodeT5 by Salesforce

• https://github.com/salesforce/CodeT5
• architecture: encoder-decoder
• parameters: 770M (?)
• release: 2020-07-06

PolyCoder

• https://github.com/VHellendoorn/Code-LMs
• tags: ai, machine learning
• paper https://arxiv.org/pdf/2202.13169.pdf
• This model was not trained to solve programming problems and may not perform well on a benchmark such as HumanEval.
• Whitespace is very important to the model, since no preprocessing was done on the input files.
• parameters: 2.7B
• release: 2020-10
• trained on: 12 programming languages (C, C#, C++, Go, Java, JavaScript, PHP, Python, Ruby, Rust, Scala, TypeScript)
• architecture: GPT-2

GPT-3 by OpenAI

• license: closed source (OINO = open in name only)
• parameters: 175B
• architecture: auto-regressive model for next token prediction
• release: 2020-06-11
• price: 0.06 USD / 1K tokens - https://openai.com/api/pricing/

CodeParrot

• https://huggingface.co/codeparrot
• CodeParrot is a GPT-2 model trained to generate Python code
• parameters: 1.5B
• architecture: GPT-2
• Code generation with: CodeParrot (1.5B), InCoder (6B) and CodeGen (6B)
• trained on: GitHub Code (32 programming languages), ...

GPT-Neo

• trained on: The Pile
• parameters: 2.7B

GPT-J by EleutherAI

• live demo: https://6b.eleuther.ai/
  • EleutherAI also developed a simple user interface for GPT-J. This interface allows users to increase the level of creativity of the model by using a parameter known as “temperature.”
• model: https://github.com/kingoflolz/mesh-transformer-jax/#gpt-j-6b
• license: open source (models, inference code, training code)
• parameters: 6B
• trained on: The Pile
• autoregressive model for text generation

GPT-NeoX by EleutherAI

• https://github.com/EleutherAI/gpt-neox/
• parameters: 20B
• release: 2022-02

AlexaTM by Amazon

• https://github.com/amazon-science/alexa-teacher-models
• encoder-decoder architecture
• trained on: causal-language-modeling (CLM), denoising tasks
• parameters: 20B
• release: 2022-11-18

Codex

• tags: ai, machine learning
• license: closed source
• free trial: 18 USD credit
• parameters: 12B

Jurassic-1 language model by AI21 labs

• https://www.ai21.com/studio
• license: closed source
• free trial: 90 USD credit

Megatron-Turing NLG by NVIDIA and Microsoft

• https://developer.nvidia.com/megatron-turing-natural-language-generation
• license: closed source
• parameters: 530B

BLOOM

• decoder-only architecture
• https://huggingface.co/docs/transformers/model_doc/bloom
• license: closed source
• 13 programming languages
• trained on: 46 natural languages, 13 programming languages
• parameters: 176B
• architecture: auto-regressive model for next token prediction (similar to GPT3)

Online Transpilers

javainuse.com

• Online Tool To Convert XML To JSON And JSON To XML
• Online JSON to Java POJO Class Converter
• JSON to NDJSON Online Converter Tool
• JSON to YAML Converter Tool
• YAML to JSON Converter Tool
• YAML to POJO Converter Tool
• XML to POJO Converter Tool
• Online Bash Shell Scripts to Windows Batch Files Converter Tool
• Online JSON to Typescript Converter Tool
• Online tool to convert Properties File to YAML format
• Online tool to convert Kubernetes YAML to Terraform HCL format
• Online tool to convert SQL to Mongo format
• Online tool to convert JSON to Kotlin format
• Online tool to convert JavaScript to Python format
• Online tool to convert Python to JavaScript format
• Online tool to convert Python to C++ format
• Online tool to convert Java to Python format
• Online tool to convert Javascript to Typescript format
• Online tool to convert Java to Javascript format
• Online tool to convert Java to Golang format
• Online tool to convert Kotlin to Java format
• Online tool to convert Java to Kotlin format
• Online tool to convert Java to C# format
• Online Tool to Convert Java to C++
• Online Tool to Convert C Code to Python
• Online Tool to Convert C Code to C++
• Online Tool to Convert Python Code to R
• Online Tool to Convert JavaScript Code to JQuery
• Online Tool to Convert Scala Code to Java
• Online Tool to Convert Java Code to Scala
• Online Tool to Convert C# Code to Java
• Online Tool to Convert PHP Code to Python
• Online Tool to Convert C# Code to Python
• Online Tool to Convert C++ Code to Java
• Online Tool to Convert Python Code to Java
• Online Tool to Convert Python Code to CSharp

GitHub topics

• https://github.com/topics/transpiler
• https://github.com/topics/source-to-source
• https://github.com/topics/program-transformation
• https://github.com/topics/metaprogramming
• https://github.com/topics/term-rewriting
• https://github.com/topics/refactoring-tools
• https://github.com/topics/static-analysis

See also

• https://github.com/transpiler/awesome-transpiler
• https://github.com/JohnDeved/awesome-typescript-compilers
• https://github.com/aalhour/awesome-compilers
• https://github.com/onelang/OneLang/wiki/OneLang-vs.-Haxe-vs.-Progsbase-comparison
• https://en.wikipedia.org/wiki/Source-to-source_compiler
• https://devopedia.org/transpiler
• https://aterik.github.io/Transpiler.and.similar.List/List/
• https://github.com/milahu/awesome-component-converters - html components: react, svelte, solidjs, vue, angular, ...
• https://cdn.intechopen.com/pdfs/14395/InTech-Automatic_generation_of_programs.pdf - Automatic Generation of Programs. by: Ondřej Popelka and Jiří Štastný
• https://arxiv.org/pdf/2202.07612.pdf - CodeGen-Test: An Automatic Code Generation Model Integrating Program Test Information. by: ZHONG Maosheng, LIU Gen, LI Hongwei, KUANG Jiangling, ZENG Jinshan, WANG Mingwen
• https://www.assemblyscript.org/ - similar to TypeScript (JavaScript), compiles to WebAsssembly, alternative to JS2C/TS2C transpilers
• https://stackoverflow.com/questions/6498850/programming-languages-that-compile-into-c-c-source
• https://softwareengineering.stackexchange.com/questions/143722/is-there-a-language-that-transpiles-to-c-with-better-syntax
• https://github.com/dbohdan/compilers-targeting-c
• https://medium.com/@ZombieCodeKill/the-a-z-of-javascript-transpilers-2d3d556fa627 - The A-Z of JavaScript Transpilers
• https://github.com/jashkenas/coffeescript/wiki/List-of-languages-that-compile-to-JS - List of languages that compile to JavaScript
• https://github.com/milahu/awesome-bidirectional-transforms - bidirectional transpilers, lenses
• https://gist.github.com/0xdevalias/d8b743efb82c0e9406fc69da0d6c6581 - Some notes and tools for reverse engineering / deobfuscating / unminifying obfuscated web app code
  • keywords: reverse engineering javascript web apps