I have a react app which displays posts by using the WP Rest APi.

To display, I'm using map() to loop through the posts.

        {posts.map((articles, i) => {
            return (
                title = {posts[i].title.rendered}
                link = {posts[i].link}         
                img = {posts[i]._embedded['wp:featuredmedia'][0].source_url}
                category = {posts[i].categories}

Because the first post doesn't have a featured image, the component breaks and I get the following console error message

Uncaught TypeError: Cannot read properties of undefined (reading '0')

If I remove the img prop, there are no issues, everything displays correctly.

Do I need to wrap the img prop into a conditional? Can you please advise on how I can fix the issue?

Any help much appreciated.

  • This is really just a JavaScript question. Yes you need to check for the existence of object properties before accessing them. This is easier if you use optional chaining: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… Commented Oct 26, 2022 at 5:03
  • Thanks Jacob. I've added the ? but still not working. img = {post?._embedded['wp:featuredmedia'][0].source_url}
    – rikardo85
    Commented Oct 27, 2022 at 8:30

1 Answer 1



If no feature image exists, then _embedded['wp:featuredmedia'] is not used.

To resolve, the prop value needs to be wrapped into a conditional.

title = {post?.title.rendered}
link = {post?.link}
img = {post && post._embedded && post._embedded['wp:featuredmedia'] ? post._embedded['wp:featuredmedia'][0].source_url : ' ' }
category = {post?.categories}

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