calling javascript code from node.js code

Question

I want to run some javascript code from external source inside node.js server and return the results. inside html code I would just use

<script>http:\\address.of.code.com\code.js</script>

how do I run this inside node.js get the results of this script and return it to the caller ?

I have no prior knowledge of the script I want to run and it's resides in external address.

Possible duplicate of Node.js: calling pure Javascript functions — abc123
– abc123, Commented Apr 6, 2016 at 18:55
@abc123 yeah this is asking something a good bit different. I think in the link you posted the idea there is that the script is within the same context, so in Node's case that would normally mean the same fs. — Christian Grabowski
– Christian Grabowski, Commented Apr 6, 2016 at 19:09

Christian Grabowski · Accepted Answer · 2016-04-06 19:05:49Z

1

I suggest looking at Node's native vm module. So building on Nazar's example:

var vm = require('vm');
var request = require('request');
request('http://address.of.code.com/code.js', function (error, response, body) {
    if (!error && response.statusCode == 200) {
           var script = vm.Script(body);
           var ctxt = {};
           script.runInNewContext(ctxt);
           console.log(ctxt);
    }
});

This pulls the script from it's remote address and runs it without affecting the code pulling the script. Here are vm's docs: https://nodejs.org/dist/latest-v4.x/docs/api/vm.html

answered Apr 6, 2016 at 19:05

Christian Grabowski

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4 Comments

Christian Grabowski Over a year ago

@Dani thanks! Mind accepting the answer in that case?

Dani Over a year ago

sure, I still have an issue - b/c the scripts need to run inside a browser apparently (missing document ect...) but it's out of the scope of this question...

Christian Grabowski Over a year ago

Oh that's probably because window === undefined in Node. If you look at vm's docs, you can define a context with global variables already defined, so you can define window as {} and it should be fine.

Christian Grabowski Over a year ago

If it does UI stuff, yes, but in theory, using vm's context you could completely fake a dom. Although I could see replicating events in there becoming a big headache.

Nazar Medeiros · Accepted Answer · 2016-04-06 18:59:46Z

1

What about this?

    var request = require('request');
    request('http:\\address.of.code.com\code.js', function (error, response, body) {
        if (!error && response.statusCode == 200) {
            console.log(body) 
         }
    })

Best regards, Nazar Medeiros

answered Apr 6, 2016 at 18:59

Nazar Medeiros

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1 Comment

Dani Over a year ago

This code get me the script but does not run it I'll try @Christian Grabowski enhancement.

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