Miserlou / execjs

Run JavaScript code from Elixir

Execjs

Execjs allows you easily run JavaScript from Elixir. It can automatically pick the best runtime available on the system.

Runtimes

Execjs supports the following runtimes:

• Node.js
• V8
• SpiderMonkey
• JavaScriptCore
• Rhino

Use the application environment (application key: :execjs, key: :runtime) to set the runtime Execjs uses. Alternatively, the EXECJS_RUNTIME environment variable can also be used to set the runtime.

Usage

eval

iex> "'red yellow blue'.split(' ')" |> Execjs.eval
["red", "yellow", "blue"]

compile/call

iex> {source, 0} = System.cmd("curl", ["-fsSL", "--compressed", "https://coffeescript.org/browser-compiler/coffeescript.js"])
iex> context = Execjs.compile(source)
iex> Execjs.call(context, "CoffeeScript.compile", ["square = (x) -> x * x"])
"(function() {\n  var square;\n\n  square = function(x) {\n    return x * x;\n  };\n\n}).call(this);\n"