Browse free open source JavaScript Compilers and projects below. Use the toggles on the left to filter open source JavaScript Compilers by OS, license, language, programming language, and project status.

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  • 1
    V Programming Language

    V Programming Language

    Simple, fast, safe, compiled language for developing software

    Simple language for building maintainable programs. You can learn the entire language by going through the documentation over a weekend, and in most cases, there's only one way to do something. This results in simple, readable, and maintainable code. Despite being simple, V gives a lot of power to the developer and can be used in pretty much every field, including systems programming, webdev, gamedev, GUI, mobile, science, embedded, tooling, etc. V avoids doing unnecessary allocations in the first place by using value types, and string buffers, promoting a simple abstraction-free code style. Most objects (~90-100%) are freed by V's auto-free engine: the compiler inserts necessary free calls automatically during compilation. A remaining small percentage of objects is freed via GC. The developer doesn't need to change anything in their code. "It just works", like in Python, Go, or Java, except there's no heavy GC tracing everything or expensive RC for each object.
    Downloads: 45 This Week
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  • 2
    TypeScript

    TypeScript

    Application-scale JavaScript

    TypeScript is an open source programming language that is a typed superset of JavaScript. It adds optional static typing to JavaScript, which can support tools for large-scale JavaScript applications for any browser, host and OS. TypeScript compiles to clean, simple JavaScript, and uses existing JavaScript code and libraries. It also offers support for the latest and evolving JavaScript features, such as async functions and decorators.
    Downloads: 22 This Week
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  • 3
    Babel

    Babel

    The compiler for writing next generation JavaScript

    Babel is a toolchain that helps you write code in the latest version of JavaScript. It converts ECMAScript 2015+ code into a backwards compatible version of JavaScript that can be run by older JavaScript engines. With Babel you can transform syntax, polyfill features that are missing in your target environment, transform source code and more!
    Downloads: 10 This Week
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  • 4
    JCppEdit v4.0

    JCppEdit v4.0

    Best IDE for Beginners

    JCppEdit is a free as well as "best IDE for Beginners" and is your one-stop IDE for all your coding needs. Whether you need to finish your Java project or submit your first HTML web page or perhaps have a need to code in C language while executing a java program into a Java IDE, JCppEdit will help you achieve your goals easily. Exploring your project and detecting an error in your code is much easier. You will not waste time detecting errors before compiling codes because you will get a real-time notification whenever you are making any mistake in your C, C++, and Java codes. You can also create multiple projects, delete, rename, cut and copy multiple files and folders in your project folder using project explorer. The programming languages that can be compiled and executed include; C, C++, Java, Java applet, C graphics, HTML, CSS, JavaScript and XML. If you are looking for a hassle-free, coding experience, then JCppEdit is the best option for you. The smooth interface and lig
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    Downloads: 69 This Week
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  • 5
    Mint

    Mint

    A refreshing programming language for the front-end web

    Mint has all the tools you need to write error-free, easily readable, and maintainable applications in record time. In Mint you can style elements directly with CSS using style blocks. Inside a style block, you can nest as many sub selectors and media queries as you like. Interpolate any Mint expressions in any value using the interpolation syntax. You can even use if and case expressions inside any block to apply styles conditionally. In Mint a store contains and manages some data. Stores are globally accessible and can be connected to components. When the data in a store changes the connected components are re-rendered. In Mint routing is a language feature instead of a library. Routes can be defined in a routes block, with support for typed path parameters. The runtime handles clicks on anchor tags and navigates in a smart way so you don't have to. You can inline any JavaScript code easily by using bacticks.
    Downloads: 7 This Week
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  • 6
    webpack

    webpack

    A bundler for Javascript and friends

    webpack is a module bundler that is primarily used for bundling JavaScript files for usage in a browser, though it can also transform, bundle, or package just about any resource or asset, including images and styles. webpack packs many modules into a few bundled assets. It can bundle ES Modules, CommonJS, and AMD modules, and create a single bundle or multiple chunks through code-splitting that are asynchronously loaded at runtime. It supports all browsers that are ES5-compliant, has a rich plugin interface that makes it very flexible, and enables the use of loaders to preprocess files.
    Downloads: 3 This Week
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  • 7
    Google Closure Compiler

    Google Closure Compiler

    A JavaScript checker and optimizer

    Closure Compiler is a production-grade JavaScript optimizer and checker that parses JS, analyzes it, removes dead code, rewrites and minifies what remains, and emits faster, smaller bundles. Beyond minification, it performs advanced optimizations such as inlining, property collapsing, type-guided rewrites, and cross-module motion, often yielding substantial load-time wins. It includes a strong static checker that validates syntax, variable references, and type annotations (Closure types or JSDoc), catching bugs early and enabling aggressive transformations safely. The ecosystem provides a Java implementation, npm/JS builds, and documentation for integrating in modern toolchains. Closure Compiler has been used extensively at scale within Google and by the broader community, proving its robustness on very large codebases. Companion repositories track npm packaging and a JS-only variant for environments where running Java is undesirable.
    Downloads: 2 This Week
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  • 8
    Marked

    Marked

    A markdown parser and compiler. Built for speed

    A low-level markdown compiler for parsing markdown without caching or blocking for long periods of time. Light-weight while implementing all markdown features from the supported flavors & specifications. Available as a command-line interface (CLI) and running in client- or server-side JavaScript projects. The only completely secure system is the one that doesn't exist in the first place. Having said that, we take the security of Marked very seriously. To prevent ReDoS attacks you can run marked on a worker and terminate it when parsing takes longer than usual. Marked can be run in a worker thread on a node server, or a web worker in a browser. Only current and LTS Node.js versions are supported. End-of-life Node.js versions may become incompatible with Marked at any point in time.
    Downloads: 2 This Week
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  • 9
    A C and C++ Library + a compiler to create Adobe Flash SWF movies up to version 9 (v1.8.1). Supports nearly all the tags, includes an ActionScript compiler. Detailed docs and other tools: convert fonts to Flash, decompile Flash, jpg2swf. LASTEST IS 1.8.4
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    Downloads: 14 This Week
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  • 10
    Waxeye is a parser generator based on parsing expression grammars (PEGs). It supports C, Java, Javascript, Python, Ruby and Scheme.
    Downloads: 6 This Week
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  • 11
    WebDGap

    WebDGap

    A PhoneGap alternative for Desktop applications.

    WebDGap allows you to convert any website or HTML/CSS/JavaScript web application to a native Windows, Mac, Linux, and Chrome application. WebDGap also gives you the option to export as a Chrome popup extension, and you can export your app or website as a native PhoneGap application making your app available for mobile devices :)
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    Downloads: 5 This Week
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  • 12
    several vaguely related projects worked on by me: a 3d engine with a javascript-like scripting language (pdsys); an older scheme dialect (vmsys); ... (2009-04-28: I have been gone for years, may try to put up some newer stuff...).
    Downloads: 4 This Week
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  • 13

    Ino-L

    Simple programming language for Windows.

    Ino-L is a TUI programming language for Windows that compiles into MS-DOS batch files. Ino-L stands for Innova Language, because Innova is French for innovation. The purpose of the language is to allow programmers the same functionality and abilities of batch files, but with simpler syntax and limited GUI, along with other things MS-DOS does not natively support. Your MS-DOS code can also be incorporated into the Ino-L source code, along with JavaScript and VisualBasic.
    Downloads: 1 This Week
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  • 14
    Pyjamas is a python to Javascript compiler, Widget set, Framework and Toolkit for Application development that runs on Web browsers. The developer need not know anything about AJAX: all the AJAX tricks, for all major browsers, are entirely taken care of.
    Downloads: 1 This Week
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  • 15
    Abacus Technologies Relational XQuery is an XQJ compatible XQuery processor that provides the ability to execute XQuery against both relational and XML data sources. Relational data can be transformed to any XML schema using XQuery's powerful features.
    Downloads: 1 This Week
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  • 16
    Acheron is a Common Lisp (CL) to JavaScript (JS) compiler. Programs are written in a subset of CL and after compilation executed in a webbrowser. Acheron has native functions that are written in JS and are the bridge between CL and JS.
    Downloads: 0 This Week
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  • 17
    Z80 ASM editor that gives you real-time info about Mnemonics, Waitstates/Clock cycles, and Labels. Features code completion, real-time debugging and T-states profiling.
    Downloads: 0 This Week
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  • 18

    C-Lesh and SMW Engine

    C-Lesh is a game programming language for 2D games.

    C-Lesh is a game programming language for 2D games - mainly arcade and platform games. When combined with the Super Mario World (SMW) engine you can create awesome 2D platform games like Super Mario World. This language evolved from a "clone" of TI-BASIC which I began developing when I was having memory (segmentation fault) bugs with C. C-Lesh lacks memory allocation and destruction. There is no need to use pointers and you can never get memory leaks or program crashes caused by memory leaks. As C-Lesh is somewhat primitive you may like it if you are into C. I'd say its a step up from C for 2D games. Everything is set - all you need is a sprite sheet and some programming knowledge.
    Downloads: 0 This Week
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  • 19
    Closure Compiler JS

    Closure Compiler JS

    Package for the JS version of closure-compiler for use via NPM

    closure-compiler-js packages Google’s Closure Compiler so it runs under JavaScript (e.g., Node.js) instead of a JVM, making advanced JS optimization accessible in more build pipelines. You get the same aggressive whole-program optimizations—dead-code elimination, property renaming, inlining, and cross-module motion—delivered via a JS API and CLI. Because it’s the compiler you know, it also honors Closure type annotations and JSDoc, enabling type-aware rewrites that shrink bundles without breaking semantics. The distribution is geared for tool authors: plug it into bundlers, custom scripts, or CI without dragging in a Java runtime. It’s particularly handy in constrained environments (serverless, sandboxed workers) where spawning a JVM is undesirable. In short, it brings Closure’s battle-tested optimizer to the places modern JavaScript actually runs.
    Downloads: 0 This Week
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  • 20
    Clue is an experimental C compiler that generates code for high-level dynamic languages such as Lua, Javascript, Perl5 and Common Lisp, as well as non-dynamic languages like C and Java. It supports the complete ANSI standard, including pointer arithmetic
    Downloads: 0 This Week
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  • 21

    Compilador C

    Compilador de lenguaje de programación C online

    Compilador C es una aplicación creada para el departamento ELAI de la EUITI. Su objetivo es brindar una herramienta de autoaprendizaje a los alumnos del laboratorio de informatica
    Downloads: 0 This Week
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  • 22
    ECCO is a web-based IDE. In other words is an online development environment with file manager, console interface for compiling and execution of code and an editor with syntax highlighting, tabs and support for many languages and accessed with a browser
    Downloads: 0 This Week
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  • 23
    ESA Provides a wrapper around the .NET scripting engine which adds support for hosting the scripting engine in a seperate AppDomain, and includes a Design-time environment for applications.
    Downloads: 0 This Week
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  • 24
    The Esoteric Project is a project devoted to providing interpreters and/or compilers for every Turing-complete Esoteric Programming Language.
    Downloads: 0 This Week
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  • 25
    Extended HTML is an extension to HTML based on XML, PHP, SQL and JavaScript technologies. The compiler is written in PHP 5 (so it can be deployed on a web page) and allows the developper to create in one file objets used both on client and server side.
    Downloads: 0 This Week
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