How can I use the Webflow API Key to upload a media file in CURL format into the assets folder?

You can’t upload media files directly to the Webflow Asset Manager using the API key and cURL, because Webflow’s current public API does not support asset uploads.

Here’s what you need to know:

1. Webflow API Limitations

• The Webflow API (v1 as of 2024) primarily allows access to CMS items, collections, e-commerce data, forms, and site publishing.
• File uploads, such as image or video files to the Asset Manager or static hosting, are not supported via the API.
• The CMS API does allow you to reference hosted media URLs, but the files must already be hosted externally (e.g., AWS S3, Cloudinary, or another CDN).

2. Workaround: Use External File Hosting

To associate media with a CMS item, you can:

• Upload your file to an external service (e.g., S3, Dropbox, Google Cloud, or ImageKit).
• Copy the public URL of the uploaded media.
• Use cURL with Webflow's CMS API to update the CMS item and include that external file link in a Link or Image field.

Example cURL:

curl -X PATCH https://api.webflow.com/collections/{collection_id}/items/{item_id} \  -H "Authorization: Bearer {your_api_key}" \  -H "Content-Type: application/json" \  -H "accept-version: 1.0.0" \  -d '{ "fields": { "name": "Test Item", "image": "https://yourcdn.com/image.jpg", "_archived": false, "_draft": false } }'

3. Future-Proof Note

• Webflow is working on API updates and announced a newer version (API v2), but it still doesn't include direct asset uploads as of mid-2024.
• Watch Webflow’s API changelog and documentation page for new upload-related features.

Summary

You cannot upload media files into the Webflow asset folder using the API or cURL. Instead, host the media externally, then use the API to attach the public URL to CMS item fields.