TypeError: forEach is not a function

I am trying to run a function that returns my article, but I keep getting:

TypeError: articles.forEach is not a function

What am I doing wrong?

Markup

<body>
   <div class="container">
    <h1 class="mb-4">Blog Articles</h1>
    <a href="/articles/new" class="btn btn-success">New Articles</a>

    <% articles.forEach(article => { %>
        <div class="card mt-4"> 
            <% article.title %>
        </div>
    <% }) %>
    </div>
</body>

Error

TypeError: C:UserstitanOneDriveDocumentsGitHubMarkdown Blogviewsindex.ejs:15
    13|     <a href="/articles/new" class="btn btn-success">New Articles</a>

    14| 

 >> 15|     <% articles.forEach(article => { %>

    16|         <div class="card mt-4"> 

    17|             <% article.title %>

    18|         </div>


articles.forEach is not a function