Can I upload JavaScript file into my Webflow project?

Design help Custom code
1

Hi guys, I think I saw it is possible before but now I can’t find a way to upload my JS file into my webflow project. Is there a way to do something like that?

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2

If you’re hosting with Webflow, you’ll add the code itself to the page (or site wide)

If you’re hosting externally, you can modify the files themselves.

3

I didn’t mean code. I need to upload js file (example: linesScript.js) in webflow and then call it via asset link. Is this possible?

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4

I found this in another similar inquiry:

5

Yes it is, first upload it to your assets as a txt file, then you would have to do something like this

<script>
    fetch('**TEXT FILE LINK FROM WEBFLOW**')
        .then(response => response.text())
        .then(script => {
            const scriptEl = document.createElement('script');
            scriptEl.type = "text/javascript";
            scriptEl.textContent = script;
            document.head.appendChild(scriptEl);
        })
        .catch(error => console.error('Error loading script:', error));
</script>
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6

Seriously, what’s the official best practice to do this properly in 2025?
Still this? Character Limit

7

Hi @Ingo_Steinke
In most places I believe the character limit is 50k now.

Best practices-

Use Embed elements for;

  • Inline CSS <style> blocks that you want to apply at design-time
  • Inline SVGs
  • Possibly JSON-LD that’s being emitted by collection lists
  • Advanced component-integrated JS

Use the Page-level custom code area for page-specific <script> code, especially the before-/body section. Use the before-/head section for async scripts, and most SEO work like special METAs, open graph content, or special icon formats.

Use the Site-level custom code areas for anything that works across all pages.

For any serious coding, write your code in TypeScript, compile, unit test and host on a CDN, and reference into your site.

Here’s a framework I use for that purpose;

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