How to Fix \'TypeError: Converting Circular Structure to JSON\' in Chrome Extension `sendRequest`?

Resolving "TypeError: Converting Circular Structure to JSON" in Chrome sendRequest

In Chrome extensions, utilizing chrome.extension.sendRequest to communicate with background scripts can lead to the "TypeError: Converting Circular Structure to JSON" error. This error occurs when the request object contains a circular reference, preventing it from being converted to JSON format for transmission.

Consider the following code snippet:

chrome.extension.sendRequest({
  req: "getDocument",
  docu: pagedoc,
  name: 'name'
}, function(response) {
  var efjs = response.reply;
});

If the pagedoc object contains a circular reference, as explained below, the code will fail with the aforementioned error.

var a = {};
a.b = a;

In JSON data, circular references are not allowed. DOM nodes also exhibit circular references, even if they are not attached to the document tree. For instance, each node has an ownerDocument property that references the document, and document.body.ownerDocument references the document again; this is just one of many circular references within the DOM tree.

Solution

To resolve this issue, identify and remove the circular references from the request object. For example, if pagedoc is a DOM node, you can remove it from the request object and instead include only its relevant properties. Alternatively, you can use a library that handles circular references.

By following these steps, you can effectively resolve the "TypeError: Converting Circular Structure to JSON" error in Chrome extension sendRequest calls.

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