d3.csv.js

/*
    Example cars.csv:
    
    Year,Make,Model,Length
    1997,Ford,E350,2.34
    2000,Mercury,Cougar,2.38

 */

d3.csv('cars.csv', function(data) {

    // To headers once
    var headers = Object.keys(data[0]);
    console.log(headers);


    // For each row outputs: ["Year", "Make", "Model", "Length"] 
    data.forEach(function(row) {
        console.log(Object.keys(row));
    });
});