I've got following use case scenario. I have web worker within which I need to fetch image that is located in NextJS public folder in order to convert it to blob.

Right now executing fetch('public/images/myImage.png'); or fetch('/images/myImage.png'); leads to an error:

Error: TypeError: Failed to execute 'fetch' on 'WorkerGlobalScope': Failed to parse URL from /images/ui/background_fire.jpg

So I assume it is not being resolved correctly like it would in say src of an image?

I've got following use case scenario. I have web worker within which I need to fetch image that is located in NextJS public folder in order to convert it to blob.

Right now executing fetch('public/images/myImage.png'); or fetch('/images/myImage.png'); leads to an error:

Error: TypeError: Failed to execute 'fetch' on 'WorkerGlobalScope': Failed to parse URL from /images/ui/background_fire.jpg

So I assume it is not being resolved correctly like it would in say src of an image?

• javascript
• reactjs
• webpack
• next.js
• web-worker

2 Answers 2

@NasiruddinSaiyed answer is a bit outdated so here is the 2021 answer:

NextJS server-side-polyfills docs

Server-Side Polyfills

In addition to fetch() on the client side, Next.js polyfills fetch() in the Node.js environment. You can use fetch() on your server code (such as getStaticProps) without using polyfills such as isomorphic-unfetch or node-fetch.

So it should just work out of the box

As per official Docs you need to use isomorphic-unfetch.

It's a simple implementation of the browser fetch API, but works both in client and server environments.

Install it

$npm install --save isomorphic-unfetch

or

$yarn add isomorphic-unfetch

Now you can use it in from getInitialProps to any where in your ponent.

Example ::

`import fetch from 'isomorphic-unfetch';`

// ... Index ponent code

Index.getInitialProps = async function() { 

  const res = await fetch('https://api.tvmaze./search/shows?q=batman');
  const data = await res.json();
    
  console.log(`Show data fetched. Count: ${data.length}`);
    
  return {
    shows: data.map(entry => entry.show)
  };
};

Happy coding!!