Overrides JSON's stringify to handle circular references
npm i --save json-circular-stringify
require("json-circular-stringify");
// JSON.stringify() is now overridden at this point
// and you can use it as you normally would
// without minding circular references any longer
var obj = {name: "Alice"};
obj.self = obj;
var json = JSON.stringify(obj);
console.log(json);
// Outputs '{"name":"Alice","self":"[Circular ~]"}'
Makes use of json-stringify-safe but takes care of overriding JSON.stringify() itself. The original JSON.stringify() is renamed to JSON.origStringify() in case you missed it.