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var traverse = require('traverse');

var obj = {
    a : [1,2,3],
    b : 4,
    c : [5,6],
    d : { e : [7,8], f : 9 },
};

var leaves = traverse(obj).reduce(function (acc, x) {
    if (this.isLeaf) acc.push(x);
    return acc;
}, []);

console.dir(leaves);