JavaScript JSON Cyclic object values

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Not all objects can be converted to a JSON string. When an object has cyclic self-references, the conversion will fail.

This is typically the case for hierarchical data structures where parent and child both reference each other:

const world = {
  name: 'World',
  regions: []

  name: 'North America',
  parent: 'America'
// {"name":"World","regions":[{"name":"North America","parent":"America"}]}

  name: 'Asia',
  parent: world

// Uncaught TypeError: Converting circular structure to JSON

As soon as the process detects a cycle, the exception is raised. If there were no cycle detection, the string would be infinitely long.

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