This middleware was created to directly inject javascript files into <script> tags via templates rendered from the Express JS framework.

Installation

npm install express-script-injector --save

Usage

var injector = require('express-script-injector');

var options = {
    path: __dirname + '/scripts' // **required** path to your scripts folder (default: undefined)
    debug: false // *optional* Enable debugging to console  (default: false)
    script: 'index.js' //  *optional* Script to inject  (default: index.js)
    enableCache: false //  *optional* Cache previously loaded scripts to RAM  (default: false)
    useRoute: false //  *optional* If set to true, it will attempt to match the root route and load a script with the same name. (default: false)
}

app.use(injector(options));

// OR

router.use(injector(options));

The injector middleware will then expose the content of a js file inside req._script, so that you can render it with a template (see example below)

Example

This example shows how it might be used with an express application using handlebars templating.

var express  = require('express'),
    exphbs   = require('express-handlebars'),
    injector = require('express-script-injector');

var app = express();

// Apply the injector middleware (note: it could also just be added to a router instead)
app.use(injector({path: __dirname + '/scripts', script: 'main.js'}));

app.engine('handlebars', exphbs({defaultLayout: 'main'}));
app.set('view engine', 'handlebars');

app.get('/', function (req, res) {

    // middleware exposes the content of the js file in req._script
    res.render('home', {injectedScript: req._script});

});

app.listen(3000);

Then somewhere in your home.hbs file:

{{{injectedScript}}}

Router Example

var
    router  = require('express').Router(),
    inject = require('express-script-injector');

router.use(inject({path: __dirname + '/../scripts'}));

router.get('*', function(req, res, next) {
    try {
        res.render('index', {script: req._script});
    } catch(e) {
        next(e);
    }
});

module.exports = router;

This outputs the js in a <script> tag with the id of "injector-" + the file name

Options