var jsonpointer = require("jsonpointer");
var obj = { foo: 1, bar: { baz: 2}, qux: [3, 4, 5]};
var one = jsonpointer.get(obj, "/foo");
var two = jsonpointer.get(obj, "/bar/baz");
var three = jsonpointer.get(obj, "/qux/0");
var four = jsonpointer.get(obj, "/qux/1");
var five = jsonpointer.get(obj, "/qux/2");
var notfound = jsonpointer.get(obj, "/quo"); // returns null

jsonpointer.set(obj, "/foo", 6); // obj.foo = 6;

$ node test.js
All tests pass.
$