cannot set property on fetch response

in the browser this works

let o = await fetch('https://deno.com');
o.asdf = 2
console.log(o.asdf)//2

let o = await fetch('https://deno.com');
o.asdf = 2
console.log(o.asdf)//2

but not in deno js

2 Replies

ChilliSniffOP•13mo ago

ok i just tested it, it works also in deno js but it gets not logged when i log the object

Deno AI Helper•13mo ago

In Deno, the fetch() function returns a Response object that is based on the web standard Fetch API. According to the documentation, the Response object is read-only and its properties cannot be modified. This is why you cannot set a new property on a Response object in Deno. In your example, you're trying to set a new property asdf on the Response object o. This is not allowed in Deno, hence it doesn't work. If you need to store additional information related to a response, consider using a separate variable or data structure.