circular-json-es6

A replacement for JSON.stringify and JSON.parse that can handle circular references (persists reference structure).

This implementation requires environments with native ES6 Map support, but is decently faster than circular-json (see benchmark with npm run bench).

var CircularJSON = require('circular-json-es6')
 
var obj = {}
obj.a = obj
 
var clone = CircularJSON.parse(CircularJSON.stringify(obj))
 
clone.a === clone // -> true

NOTE

The default stringify method optimizes for cases where no circular reference is present by trying a plain JSON.stringify first. This means if no circular references are found in the data then it will not persist multiple (but non-circular) references to the same object.

If you want to enforce reference persistence, use CircularJSON.stringifyStrict instead.