What tcl-duktape
Description A binary Tcl extension that proves bindings for Duktape, an embedded JavaScript interpreter.
Online demo hosts an integrated Tcl/JS REPL shell.
Platforms Tested on Linux and FreeBSD.
Prerequisites Tcl 8.5 or newer, TclOO required for the OO wrapper.
Updated 2020-10-23 (v0.9.0)
License MIT
Contact dbohdan

Duktape is just a pair of .c/.h files, which makes the package easy to build. tcl-duktape allows you to call JavaScript code from Tcl and exposes a jsproc interface similar to the cproc interface in Critcl that allows you to write procedures in JavaScript. Included in the package is a TclOO API wrapper for tcl-duktape objects and one for JSON objects.

Sample code

#!/usr/bin/env tclsh
package require duktape
package require duktape::oo

set duktapeObj [::duktape::oo::Duktape new]
$duktapeObj jsproc ::add {{a 0 number} {b 0 number}} {
    return a + b;
puts [add 1 2]
$duktapeObj jsmethod cos {{deg 0 number}} {
    return Math.cos(deg * Math.PI / 180);
puts [$duktapeObj cos 360]
$duktapeObj destroy


wiwo 17.02.2017: How can modules be loaded? When I try to load a JS file with require, I get "ReferenceError: identifier 'require' undefined"

dbohdan 2017-02-23: Duktape can't access the file system and thus has no Node.js-style require(). What you can do is read the module file in Tcl code and then have an interpreter instance eval it. There is an example that does this on the project wiki.


See also