in node.js express, how to tell the HTTP request is application/json or html on the content negoition in jquery -

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i want node.js server send different content based on request's content type, server code 

    if(req.accepts('text/html')){         console.log("accepts('text/html')");         locals.page = 'posts';                           res.render('question.ejs', locals.questions);     }     else if(req.accepts('application/json')){            console.log("'application/json'");                   res.json(200,locals.questions);     }

there similar post android client in node.js express, how tell http request application/json or html on content negoition

this jquery code

$.ajax({ type: "get", url: "/course/abc/questions", contenttype:"application/json; charset=utf-8", datatype:"json", success: function(data){ console.log(data.length,data); } });

for reason, set content type on appication/json, node.js server side still accepts html rather json.

a little strange

the headers different on request (jquery) vs response (express). on request/browser/jquery/ajax side, when making request, set accept header, meaning "i 1 of these formats". there no content-type header because request has no body, header not applicable.

on server side, set content-type, meaning "this response body of following format". semantics of accept can list of alternative formats, whereas content-type single value.

here's snippet copied this answer

$.ajax({     headers: {          accept : "application/json; charset=utf-8"     },     success : function(response) {         ...     } })

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