This is already an object, so you can do this:
var str = {"Count":1,"Items":[{"token":{"S":"token"},"uid":{"S":"33c02130-66b5-11e3-bdb0-7d9889f293b5"},"password":{"S":"$2a$10$ervzJ.DWjHOXRtJSugTaWuquI2OvPLyipa4YXecc/2KdQnmhrHxr6"},"username":{"S":"foo"},"plate":{"S":"dinner"},"name":{"S":"Test Name"},"server":{"S":"bar"}}]};
alert(str.Items[0].password.S);
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solved Javascript parse JSON string [closed]