Based on your existing comments it appears that you're running this code in the browser and you also don't have browserify or any other bundler in your project.

That conclusion came from the fact that you commented that you got the error

require is not defined

require is a function specific to server side NodeJS projects and doesn't exist in the browser. If you want to use the require function you need to use a bundler like browserify or webpack that will fetch the relevant packages from your node_modules folder and bundle them together for your front-end to use.

The reason you're getting the

Expected a JavaScript module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.

error is because when you ask javascript to run the following:

import {nanoid} from 'nanoid';

what the browser thinks is that the directory containing the current page also has a file called nanoid and is making a request for that file.

Consider the following:
If my page is at https://google.com and my code says import {nanoid} from 'nanoid' the browser is going to make a request to https://google.com/nanoid and the browser is expecting a javascript file but it's likely receiving an error 404 html page.

Remember, the browser does not have access to your node_modules folder unless it's publicly exposed on your webserver and in that situation you need to tell it the exact path to the file you're trying to import.

What can you do?

You can add webpack or browserify or some other bundler to your project but that might require a bit of work and you mentioned you're a beginner so I don't think it'd be a good idea to jump right in.

The other option might be to add the browser version of the nanoid code directly into your own project.

I've taken the browser version of the code from the github https://github.com/ai/nanoid/blob/main/index.browser.js and put it into a script tag (getting rid of the urlAlphabet import) below that you can add to your code. Keep in mind this code will add the nanoid, customAlphabet, customRandom, urlAlphabet, and random variables globally so make sure there aren't any collisions with your global variables.

<!-- Code for nanoid directly from the github with urlAlphabet import removed -->

<!-- https://github.com/ai/nanoid/blob/main/index.browser.js -->

<script>

let urlAlphabet =

  'useandom-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict'

let random = bytes => crypto.getRandomValues(new Uint8Array(bytes))

let customRandom = (alphabet, size, getRandom) => {

  let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1

  let step = -~((1.6 * mask * size) / alphabet.length)

  return () => {

    let id = ''

    while (true) {

      let bytes = getRandom(step)

      let j = step

      while (j--) {

        id += alphabet[bytes[j] & mask] || ''

        if (id.length === size) return id

      }

    }

  }

}

let customAlphabet = (alphabet, size) => customRandom(alphabet, size, random)

let nanoid = (size = 21) => {

  let id = ''

  let bytes = crypto.getRandomValues(new Uint8Array(size))

  while (size--) {

    let byte = bytes[size] & 63

    if (byte < 36) {

      // `0-9a-z`

      id += byte.toString(36)

    } else if (byte < 62) {

      // `A-Z`

      id += (byte - 26).toString(36).toUpperCase()

    } else if (byte < 63) {

      id += '_'

    } else {

      id += '-'

    }

  }

  return id

}

</script>



<p id=code></p>



<!-- You can now use the nanoid() function in your javascript code -->

<script>

const id = nanoid();



document.getElementById(code).innerHTML = id;

</script>