CODEWITHSUNDEEP
javascriptreactjs
Mark
Mark

Reputation: 1551

Getting error: "Objects are not valid as a React child" on array rendering

I'm trying to do a simple task. Rendering contents of an array:

const [comments, setComments] = useState([]);   // an array to begin with


handleFetch = () => {
   ...
   ...
   const obj = resp.data.comments;
   const new_array = new Array();
   new_array.push(obj);
   setComments(new_array);
   ...
}


return (

    {comments.forEach(comm => <p>{comm.post}</p>)}
);

comments (resp.data.comments) come in as an array of objects:

comments = [{'post': 'something', 'timestamp': 'some time'}]

Error output I'm getting:

Error: Objects are not valid as a React child (found: object with keys {post, timestamp}). If you meant to render a collection of children, use an array instead. (But I'm using an array. An array of objects)

Upvotes: 1

Views: 60

Answers (2)

Ayaz
Ayaz

Reputation: 2121

Since resp.data.comments is an array, you can directly set to it to state comments using setComments(resp.data.comments) and use Array.prototype.map function in jsx to render.

const [comments, setComments] = useState([]);   // an array to begin with


handleFetch = () => {
   ...
   ...
   setComments(resp.data.comments);
   ...
}


return (
<>
    {comments.map(comm => <p>{comm.post}</p>)}
</>
);

Upvotes: 3

Viet
Viet

Reputation: 12787

You need to use .map() to return the value. So you can fix like this:

return (
  <>
    {comments.map((comm, index) => <p key={index}>{comm.post}</p>)}
  </>
);

Upvotes: 1

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