*%(basename)s:28: TypeError: Converting circular structure to JSON --> starting at object with constructor 'Object' | property 'first' -> object with constructor 'Object' | property 'x' -> object with constructor 'ArrayHolder' | ... | index 1 -> object with constructor 'Inner' --- property 'y' closes the circle JSON.stringify(root); ^ TypeError: Converting circular structure to JSON --> starting at object with constructor 'Object' | property 'first' -> object with constructor 'Object' | property 'x' -> object with constructor 'ArrayHolder' | ... | index 1 -> object with constructor 'Inner' --- property 'y' closes the circle at JSON.stringify () at *%(basename)s:28:6