Ghost: Display All Tags

frontend.js

//insert at line 61 in: /core/server/controllers/frontend.js

function formatPageResponse(posts, page) {
    // Delete email from author for frontend output
    // TODO: do this on API level if no context is available
    posts = _.each(posts, function (post) {
        if (post.author) {
            delete post.author.email;
        }
        return post;
    });
    return {
        posts: posts,
        pagination: page.meta.pagination,
        all_tags: formatTags(posts)
    };
}

function formatTags(posts) {
    var check = [];
    var tags = [];
    posts.forEach(function(p,i) {
        p.tags.forEach(function(t,j) {
            if(check.indexOf(t.name) < 0) {
                tags.push(t);
                check.push(t.name);
            }
        });
    });
    return tags;
}

handlebars template

        {{#foreach all_tags}}
        <li><a href="{{url}}">{{name}}</a></li>
        {{/foreach}}