What happens if you use JSON.stringify() on a @wire value?

What happens if you use JSON.stringify() on a @wire value? 

• The data you get from @wire isn’t a “normal” JavaScript object. Salesforce wraps it in a Proxy so it stays reactive.

• If you do JSON.stringify(data), Salesforce converts that Proxy into a plain JSON string.

  • When you then JSON.parse(...) it back, you get a normal object (no Proxy, no reactivity).

• This is useful if you just want a copy of the data to work with, but:

  • It drops any functions or hidden fields,

  • Dates become text,

  • undefined fields disappear,

  • If the object has circular references, it will throw an error.

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Simpler analogy:
Think of the @wire object like a live mirror that Salesforce keeps updated.
JSON.stringify takes a snapshot photo of that mirror — you get the picture (data at that moment) but it’s no longer “live.”