Tiny javascript implementation?

Question

I need an extremely tiny implementation of (maybe a subset of?) Javascript. Code size and memory usage are extremely important (speed isn't in the question, it can run as slow as it likes). It must be written in C (not C++), and that too, ANSI C (GCC extensions are okay). If it runs on a VM would be best, because I will have to write a compiler for it. Any suggestions?

EDIT: Both of the responses I have seem good, except:

SpiderMonkey concentrates a lot on making it faster, I don't care if its fast at all.
Quad-Wheel sounds good, except the activity on it, and code comments are few (I will be porting this to another architecture if that helps).

So, any other responses would be great. Or, I could roll out my own simplified version of JS (but that doesn't sound fun at all)

It might help if we know what your use case is. An embedded controller, perhaps? — Robert Harvey, Mar 21 '11 at 23:02
Must you use Javascript? For example, there are a wide variety of implementations of Scheme (or even Forth) that are small and perhaps well suited for your application. — Greg Hewgill, Mar 21 '11 at 23:24
There already exists eLua. I would like to create my own :) Scheme sounds good, and, it would be very easy to write an interpreter for. — Dhaivat Pandya, Mar 22 '11 at 01:59

score 24 · Accepted Answer · answered Feb 14 '14 at 21:21

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Duktape is written in C, with a focus on portability and compact footprint: http://duktape.org/

answered Feb 14 '14 at 21:21

Samuli Pahaoja

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Compared to some of the alternatives, Duktape's documentation is excellent. I'm moving from muJS to Duktape for that very reason. – CyberFonic Dec 05 '14 at 22:05
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What is the RAM footprint of Ducktape? I can't find any documentation on that. I know that Espurino can start in as little as 8K – JockM Mar 14 '18 at 22:14

score 14 · Answer 2 · edited May 03 '15 at 16:19

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I just discovered this ruby: https://github.com/gfwilliams/tiny-js

I've been looking quite some time for this, since spidermonkey/v8 usually is pretty big and comes with several dependancies. Tiny-js is a portable 'run make and your done'-linux c-class. Perfectly for if you are only looking for simple bindings and prefer javascript/c-syntax over lua/other awesome scriptinglanguages.

edited May 03 '15 at 16:19

Xavier Combelle

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answered Sep 10 '12 at 10:04

Coder of Salvation

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+1 and accept. This is pretty awesome. Sorry for the response being a year and a half late. – Dhaivat Pandya Feb 12 '13 at 00:23
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tiny-js is in C++ not C as you expected. – rahulg Feb 12 '13 at 09:27
It seems that tiny-js is effectively unmaintained. No commits since July 2013. – Alec Thomas Sep 24 '14 at 05:20
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It would appear that Duktape (@Samuli Kärkkäinen, below) is a more up to the moment alternative. Since it implementants ECMA standards it better conforms to the principles of "object based" implementations. – CyberFonic Dec 05 '14 at 22:08

score 4 · Answer 3 · answered Mar 21 '11 at 23:06

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An ANSI-C engine for ECMA-262: http://code.google.com/p/quad-wheel/

Mozilla SpiderMonkey is written in C as well, but probably to complex and large for you?

answered Mar 21 '11 at 23:06

Björn

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score 2 · Answer 4 · answered Dec 05 '14 at 22:04

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muJS from Artifex Software might be another option for embedded JS/ES implementation.

answered Dec 05 '14 at 22:04

CyberFonic

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score 2 · Answer 5 · answered Mar 21 '11 at 23:04

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SpiderMonkey is Mozilla's C implementation of JavaScript.

http://www.mozilla.org/js/spidermonkey/

answered Mar 21 '11 at 23:04

Robert Harvey

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score 1 · Answer 6 · answered Apr 30 '14 at 13:19

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You should look at Jsi, which was just released. It is very small, is a subset of javascript, and is in C (derived from quadwheel).

answered Apr 30 '14 at 13:19

pcmacdon

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Could you provide a pointer to "jsi"? I can't find "Jsi" anywhere, or anything that points from quadwheel (quad-wheel?) to Jsi. – Pekka May 08 '14 at 01:38
@Pekka Perhaps https://github.com/pcmacdon/jsish – tekknolagi Aug 16 '22 at 09:25

score 0 · Answer 7 · edited Jun 20 '20 at 09:12

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I think the jsi he's talking about is this: http://pdqi.com/cgi-bin/cgiwrap/pdqi/jsi.cgi/doc/tip/jsi/www/usingjsi.wiki

(Don't blame it is not... hehe)

edited Jun 20 '20 at 09:12

Community

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answered Apr 21 '15 at 19:14

Alfgaar

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score 0 · Answer 8 · answered Jun 13 '16 at 19:40

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http://jsish.org will redirect you to the host site.

answered Jun 13 '16 at 19:40

Peter MacDonald

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Welcome to Stack Overflow! Whilst this may theoretically answer the question, [it would be preferable](//meta.stackoverflow.com/q/8259) to include the essential parts of the answer here, and provide the link for reference. – Enamul Hassan Jun 13 '16 at 19:56

score 0 · Answer 9 · answered Sep 15 '16 at 07:15

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https://github.com/cesanta/v7 is designed for embedded systems. Has very small footprint.

answered Sep 15 '16 at 07:15

valenok

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score 0 · Answer 10 · answered Oct 13 '16 at 07:49

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Have you looked at JerryScript?

answered Oct 13 '16 at 07:49

user835611

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score 0 · Answer 11 · answered Oct 18 '18 at 02:00

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If you are completely expect a full Node.js runtime at embeddable, ShadowNode might be a good for you.

https://github.com/Rokid/ShadowNode

answered Oct 18 '18 at 02:00

Yorkie

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Tiny javascript implementation?

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