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LiveCodes supports over 90 programming languages, frameworks, and processors that run directly in the browser. All compilation and execution happens client-side with zero server dependencies.

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Language Categories

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Web Frameworks

Modern frontend frameworks with full component support:

React

JSX/TSX with React Compiler

Vue

Vue 2 and Vue 3 SFC support

Svelte

Svelte 5 compiler

Solid

Solid.js with JSX

Stencil

Web Components

Riot

Component-based UI

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JavaScript Variants

JavaScript

ES2020+ with native support

TypeScript

Full type checking support

CoffeeScript

Ruby-inspired syntax

LiveScript

Functional programming

Civet

TypeScript with CoffeeScript syntax

Imba

Memoized DOM framework

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CSS Processors

Powerful CSS preprocessing and utility frameworks:

SCSS/Sass

Modern Sass compiler

Less

Dynamic stylesheet language

Stylus

Expressive CSS preprocessor

Tailwind CSS

Utility-first CSS framework

UnoCSS

Instant on-demand atomic CSS

PostCSS

CSS transformation tool

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Template Engines

HTML preprocessors and template languages:

Pug

Clean, whitespace-sensitive syntax

Haml

HTML abstraction markup

Handlebars

Semantic templates

EJS

Embedded JavaScript templates

Nunjucks

Jinja2-inspired templates

Liquid

Safe, customer-facing templates

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Backend Languages

Server-side languages running in the browser:

Python

Brython & Pyodide support

Ruby

Opal compiler

PHP

Uniter runtime

Go

Yaegi interpreter

Lua

Fengari & Wasmoon support

Perl

WebPerl runtime

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Compiled Languages

Statically-typed languages with WebAssembly compilation:

C/C++

Compiled to WebAssembly

C#

WebAssembly support

Go (WASM)

TinyGo WebAssembly

Rust

Via WebAssembly

AssemblyScript

TypeScript-like WASM

WebAssembly

WAT text format

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Functional Languages

ReScript

Type-safe JavaScript

Reason

OCaml syntax for React

OCaml

Functional programming

Scheme

Lisp dialect

ClojureScript

Clojure for JavaScript

Common Lisp

JSCL implementation

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Data & Query Languages

SQL

SQLite via SQL.js

PostgreSQL

PGlite in-browser

Prolog

Logic programming

MiniZinc

Constraint modeling

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Other Languages

  • Markdown/MDX: Documentation and content
  • AsciiDoc: Technical documentation
  • Astro: Multi-framework support
  • Diagrams: Mermaid, PlantUML, GraphViz
  • Blockly: Visual programming
  • Julia, R, Tcl, Teal, Fennel, Gleam: Specialized languages

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Language Features

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Client-Side Execution

All languages compile and run entirely in the browser:
  • No server required
  • Zero-latency compilation
  • Privacy-preserving (code never leaves your browser)
  • Offline-capable

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Editor Support

Rich editing experience for all languages:
  • Syntax highlighting (Monaco, CodeMirror, CodeJar)
  • IntelliSense and autocomplete
  • Error diagnostics
  • Format on save

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Import Support

Import external packages directly: 
import { useState } from 'react';
import _ from 'lodash';
Supported registries:
  • npm via esm.sh, jsDelivr, unpkg
  • Python packages via Pyodide
  • Ruby gems via Opal stdlib

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Custom Configuration

Configure compiler options per language: 
{
  "customSettings": {
    "typescript": {
      "target": "es2020",
      "strict": true
    },
    "babel": {
      "plugins": ["decorators"]
    }
  }
}

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Language Selection

Languages are automatically detected by file extension or can be explicitly set:
  • .js → JavaScript
  • .ts → TypeScript
  • .jsx → JSX
  • .tsx → TypeScript + JSX
  • .py → Python
  • .rb → Ruby
  • .go → Go
  • And 80+ more extensions

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Performance

Language compilers are loaded on-demand:
  • Initial page load: ~50KB (core runtime)
  • Language compiler: Loaded only when needed
  • Cached for subsequent uses
  • Progressive Web App support

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Browser Compatibility

All languages work in modern browsers:
  • Chrome/Edge 90+
  • Firefox 88+
  • Safari 14+
  • Mobile browsers supported
Some languages (WebAssembly-based) require browsers with WASM support.

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Next Steps

JavaScript

Learn about JavaScript support

TypeScript

Explore TypeScript features

React

Build React applications

Python

Run Python in the browser