Hey @gokulnk  you pass the permlink parameter  to the ```steem.broadcast.comment``` function so you should already have access to it. For example here I am using the string function to store the permlink for the comment before broadcasting, if you needed you could pass it to the callback function too.

```
 let permlink = randomString();
 steem.broadcast.comment(
            author_wif,
            '',
            tag,
            author_name,
            permlink,
            '',
            comment,
            { tags: ['tag1'], app: 'helloworld/v.0.0.1' },
            function(err, result) {
              console.log(err, result);
            }
          );
```
```
function randomString() {
    let string = ''
    let allowedChars = "abcdefghijklmnopqrstuvwxyz0123456789";
    for (var i = 0; i < 32; i++){
        string += allowedChars.charAt(Math.floor(Math.random() * allowedChars.length));
    }
    return string + '-post';
}
```