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copied!<p>You can certainly pass your <code>app</code> object to other modules and call <code>use</code> there. Of course, middleware functions are executed <strong>in the order they are added</strong>, so you have to take great care to ensure that you call <code>use</code> in the correct order.</p> <p>app.js</p> <pre><code>var app = express(); // ... app.use(express.logger()); // first middleware function var someOtherModule = require('./mod.js'); someOtherModule.init(app); app.use(express.static()); // last middleware function) </code></pre> <p>mod.js</p> <pre><code>exports.init = function(app) { app.use(function(req, res, next) { }); }; </code></pre> <hr> <p>As far as actually <em>injecting</em> a middleware function in the middle of the stack (after you've already called <code>app.use</code> with a set of middleware functions), there's no documented way to do it. <code>use</code> only adds a function to the end of the stack.</p> <p><code>use</code> is actually supplied by Connect in <a href="https://github.com/senchalabs/connect/blob/2.7.0/lib/proto.js#L62-93" rel="noreferrer">proto.js</a>:</p> <pre><code>app.use = function(route, fn){ ... this.stack.push({ route: route, handle: fn }); return this; }; </code></pre> <p><em>Technically</em>, you could fiddle with <code>app.stack</code> yourself, but <strong>I would not do this</strong>. You'd be messing with an undocumented implementation detail, which is liable to change. In other words, it's possible a future update to <em>either</em> Connect or Express could break your app.</p>

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