How to prefetch external JSON and use it?

Question

I want to prefetch (or maybe preload) a JSON file from an URL and use it later on my JS file. How can I send the prefetched JSON to the JS file?

Something like on the HTML head:

<link rel="prefetch" href="https://json.file" as="fetch">

or on the JS file:

fetch("the prefetch file above")
  .then((res) => res.json())
  .then((data) => {
  });

Abdurrahman Alsallakh · Accepted Answer · 2024-05-03 11:18:00Z

-1

you can use this

<link rel="prefetch" href="/data.json" as="fetch">

by this instead of going to the server again and ask for the file when you want to use it, the browser will load the resource from the cache.

fetch('/data.json')
    .then(response => {
    // some code
    })
    .then(json => {
        // some code
    })
    .catch(console.error);

answered May 3, 2024 at 11:18

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2 Comments

Thanks for your answer! Can I do that even if the prefetch is loading an external resource? Like: 'href="www.somewebsite/data.json"'

yes any link to an accessible file will work