To avoid cross-domain issues, you can do this using JSONP:
$.getJSON("http://en.wikipedia.org/w/api.php?action=query&prop=extracts&exintro&format=json&callback=?&titles=Google", function(data){
var page = data.query.pages;
var intro = "";
for (var key in page) {
var obj = page[key];
intro = obj.extract;
}
console.log(intro);
});
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solved Is there a way to get the main paragraph from Wikipedia using JavaScript only? [closed]