expressjs middleware for injecting some code in result
var getSnippet = function(){
return '<!-- labelSimple -->' +
'<div>simple snippet</div>';
}
var snippetExists = function(body){
return body.indexOf('labelSimple')>=0;
}
var placeholder = "<simpleSnippetPlaceholder/>";
if placeholder are not specified then snippet was inserted after '' tag
app.use(require('expressInjector')(getSnippet,snippetExists,placeholder));
in index.html or other html file
<html>
<head></head>
<body>
<div>
Hi people
</div>
<simpleSnippetPlaceholder/>
</body>
</html>
in result we are have
<html>
<head></head>
<body>
<div>
Hi people
</div>
<div>simple snippet</div>
</body>
</html>