Julia → JavaScript

Transpiler

Transpile Julia functions to JavaScript via typed IR. Arrays, strings, math, closures, structs — all transpile to clean, efficient JS.

Get StartedView on GitHub
using JavaScriptTarget

# Write Julia — compiles to JavaScript
function physics(x::Float64, v::Float64, dt::Float64)
    a = -9.81
    v_new = v + a * dt
    x_new = x + v_new * dt
    return (x_new, v_new)
end

# Compile to JS
result = compile(physics, (Float64, Float64, Float64))
println(result.js)  # Clean JS output

Try it Live

Write Julia on the left — see transpiled JavaScript on the right. Runs entirely in your browser.

Note: This is a lightweight browser-only playground with a subset of JST's capabilities. The full JavaScriptTarget.jl package runs in Julia and supports the complete transpilation pipeline — arrays, broadcasting, structs, closures, package registry, and 50+ Julia operations. See the Getting Started guide to use the full transpiler.

Typed IR

Walks Julia's typed IR (code_typed) to generate JS. Type-driven compilation — not string hacking.

Package Registry

Register custom compilations for any Julia package. PlotlyBase, DataFrames — they just compile.

Tiny Output

No framework runtime. Each compiled function is self-contained JS. Inline-able in <script> tags.