Capitalize all Tags in Zotero via JS API

rename-tags.js

var tags = await Zotero.Tags.getAll();
for (let tag of tags) {
    let new_tag = ""
    for (let part of tag.tag.split(" ")) {
        new_tag = new_tag.concat(" ", part.charAt(0).toUpperCase() + part.slice(1));
    }
    Zotero.Tags.rename(Zotero.Libraries.userLibraryID, tag.tag, new_tag);
}