code:
define('nano', [], function(){
return function (template, data) {
return template.replace(/{([\w.]*)}/g, function(str, key) {
var keys = key.split("."), v = data[keys.shift()];
for (var i = 0, l = keys.length; i < l; i++) v = v[keys[i]];
return (typeof v !== "undefined" && v !== null) ? v : "";
});
};
});

thanks for this great piece of code, my only issue was that it does not work if the key has a space in it.
for example
{
"sku": "sdf3de",
"product name": "widget2"
}

it will work with sku, but not with "product name"

var template = "

$.getJSON("http://search.twitter.com/search.json?callback=?", {
q: query
}, function(data) {
container.html("")
$.each(data.results), function(i, item){
container.append($.nano(template, item))
}
}

}

this is never work becouse wrong position of ')' after data.results
in $.each(data.results),

Just looked at nano.js and you could easily make it several characters. It is interesting that you spend time making should you do not output null or undefined, but don't check that undefined[keys[]] or null[keys[]] is not protected, you could put it in the while(i < l && ...) adds code though.

function nano(template, data) {
return template.replace(/{([\w.]*)}/g, function(str, key) {
var keys = key.split("."), v = data[keys.shift()], i = 0, l = keys.length;
while(i < l) v = v[keys[i++]];
//simple while, hoisted variables up to avoid extra 'var', increment on use
return (typeof v == "undefined" || v == null) ? '' : v;
//change double negative save two chars.
});
}

Just sharing what I happen to see, really not any issue and I can close out either way.

Stack before the crash - works for the first 3 items.

fiddle's version work, while github's version don't.

please check the code. thank you.

btw, this code snippet is very Q and powerful. good job!

Way to escape. Current work around I found is to write it as "{output{}}" to display "{output}" need a cleaner way such as {{output}}