Last updated: Aug-18-2025
OverviewLearn how to automatically add a generated caption to an asset's contextual metadata after a successful upload for use as alt text, with the Cloudinary Node.js SDK.
Video tutorial Tutorial contentsThis tutorial presents the following topics. Click a timestamp to jump to that part of the video.
Introduction   0:00 AI can automatically generate captions for your images. To use these captions as alt text, you first need to attach them to the image. This can be achieved by using theon_success handler to save the generated caption to the assetâs contextual metadata. Once saved, this metadata can be accessed to place as alt text in your code. Auto-generate a caption on upload   0:21 Upload an image and include the detection: âcaptioningâ parameter with the upload method to automatically generate an image caption. Run the script and check the caption in the response   0:30 Execute the script by running npm run start. The response will contain the automatically generated caption. You can review the image to make sure the caption accurately describes its content. Your caption should be suitable and ready to use as alt text. Save the caption as contextual metadata with on_success   0:54 Attach the caption to the image as contextual metadata using the on_success handler, which takes a string parameter to define attributes for the asset. Here's what we'll do:
current_asset.update to update the asset upon successful uploads.tags:[âautogeneratedâ]context:{caption : e.upload_info?.info.detection?.captioning?.data?.caption}npm run start. The on_success handler was triggered upon successful upload, and it returned a successful response as displayed. View the caption in the asset's contextual metadata   3:06 In the Cloudinary Media Library, click the image to view its details in the Preview pane. (If the Preview pane is closed, click the Open Preview button to display it.) Within the Preview pane, navigate to the Metadata tab to find the auto-generated caption in the Contextual metadata section and the autocaption tag in the Tags section. This contextual metadata can now be used as alt text in our code. Keep learning If you like this, you might also like...
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