extractBase64Images(html)
Extracts base64-encoded images from an HTML string and replaces each one with a Content ID (cid:) reference, the way images are referenced in email attachments. Nothing is saved — the function returns the images so you can store them yourself, for example with saveEmbeddedFile, or use extractAndEmbedBase64Images to extract and save in one step.
Only src attributes in double quotes are recognised (src="data:image/png;base64,..."), and only the types png, jpg, jpeg, gif, webp, avif, heic and heif. SVG is not extracted.
Parameters
htmlstringrequiredThe HTML string that contains images encoded in base64 format, which are to be extracted.
Returns
An object { Html, Images }. Html is the HTML with each image replaced by src="cid:<ContentId>". Images is a list of { Base64, Type, ContentId, Mime }.
Example
let html = '<html><body><h1>Sample Image</h1><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="small image"/></body></html>';
let extract = docly.extractBase64Images(html);
return extract; // { Html, Images: [ { Base64, Type, ContentId, Mime } ] }